Lincoln Nautilus: Climate Control System - General Information / Climate Control System. Diagnosis and Testing

Normal Operation and Fault Conditions

A/C Pressure Transducer, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Low refrigerant charge
• Wiring, terminals or connectors
• A/C pressure transducer
• PCM

Visual Inspection and Pre-checks

• Inspect for loose or corroded A/C pressure transducer connections.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: The following pinpoint test step is tested in ambient temperature of approximately 21.1°C (70°F). As ambient temperatures near 38°C (100.4°F), the pressure value difference increases above ± 15 psi (103 kPa) range

• Allow the A/C system to stabilize to the outside ambient temperature. This can take a soak period of at least 6 hours.

• Connect the manifold gauge set.

• Ignition ON.

• Access the  PCM  and monitor the  ACP_PRESS (kPa)  PID

• With the manifold gauge set connected, compare the pressure readings of the manifold gauge set and the PCM PID .

• Ignition OFF.

• Disconnect PCM C1381B or C1551B .

• Disconnect A/C pressure transducer C1260 .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1260-1		Ground
  C1260-2		Ground
  C1260-3		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1260-1		Ground
  C1260-2		Ground
  C1260-3		Ground

• Measure:
  Click to display connectors

    2.0L

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C1260-1		C1381B-36
  C1260-2		C1381B-30
  C1260-3		C1381B-13

  
  Click to display connectors

    2.7L

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C1260-1		C1551B-28
  C1260-2		C1551B-69
  C1260-3		C1551B-82

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1260-1		C1260-2
  C1260-1		C1260-3
  C1260-2		C1260-3

• Ignition OFF.

• Disconnect and inspect all PCM electrical connectors.

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all PCM electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Yes	CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,    Click here to access Guided Routine (PCM).

Normal Operation and Fault Conditions

When A/C is requested and A/C conditions allow, the PCM energizes the clutch relay control circuit that is hardwired to the A/C clutch control input processing in the BJB . For additional information on A/C Request, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Fuse
• Wiring, terminals or connectors
• A/C clutch relay [non-serviceable, part of the BJB ]
• PCM

Visual Inspection and Pre-checks

• Make sure BJB fuse 22 (10A) is OK

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

• Ignition OFF.

• Disconnect PCM C1381B or C1551B .

• Disconnect BJB C1035A .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035A-37		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035A-37		Ground

• Measure:
  Click to display connectors

    2.0L

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035A-37		C1381B-62

  
  Click to display connectors

    2.7L

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035A-37		C1551B-19

• Ignition OFF.

• Disconnect and inspect all PCM electrical connectors.

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all PCM electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Yes	CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,    Click here to access Guided Routine (PCM).

Normal Operation and Fault Conditions

The externally controlled variable displacement compressor is electronically controlled by the PCM . The PCM pulse width modulates the ground to the externally controlled variable displacement compressor to change the displacement of the A/C compressor. REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Fuse
• Wiring, terminals or connectors
• Low refrigerant charge
• A/C system discharged or low refrigerant charge
• A/C compressor
• PCM

Visual Inspection and Pre-checks

• Inspect for loose or corroded A/C compressor connections.
• Make sure BJB fuse 12 (15A) is OK.
• Verify the A/C compressor belt is OK.
• Verify the A/C compressor clutch is engaged/operating.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Make sure the Air Conditioning (A/C) Compressor clutch is on or is engaged in this step.

NOTE: Proper Air Conditioning (A/C) system diagnosis on a vehicle's compressor is dependent on correct refrigerant system charge and tested in ambient temperatures above 21.1°C (70°F).

NOTE: Make sure the EVDC100 Tester, the EVDC101 valve harness module, (and the connector adapter EVDC102, if required) are properly connected per the instruction manual and the operation video.

• Test the EVDC compressor displacement, following the instructions in the user manual supplied with the Model EVDC®100 A/C Compressor Electronic Control Valve Tester and the EVDC 100 Tester Operation video found on the Ford PTS Home tab, Technical Support Videos.

• Ignition OFF.

• Disconnect Externally Controlled Variable Displacement Compressor (EVDC) C1110 .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1110-2		Ground

• Ignition OFF.

• Disconnect PCM C1381B or C1551B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1110-1		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1110-1		Ground

• Measure:
  Click to display connectors

    2.0L

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C1110-1		C1381B-59

  
  Click to display connectors

    2.7L

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C1110-1		C1551B-79

• Ignition OFF.

• Disconnect and inspect all PCM electrical connectors (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all PCM electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Yes	CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,    Click here to access Guided Routine (PCM).

• Ignition OFF.

• Disconnect and inspect all electrical connectors on the compressor

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all Compressor electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

Cabin Heater Coolant Pump, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Low coolant or air in the coolant system
• Cabin heater coolant pump
• PCM

Visual Inspection and Pre-checks

• Make sure BJB fuse 12 (15A) is OK.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Allow the engine to cool before checking the engine coolant level.

• Make sure that the vehicle is on a level surface.

• Make sure that the steering wheel is set to the straight ahead position.

• Ignition OFF.

• Visually inspect the engine coolant level at the degas bottle.

• Ignition ON.

• Using a diagnostic scan tool, CARRY OUT the PCM self-test. Record the PCM Diagnostic Trouble Codes (DTCs). CLEAR all PCM Diagnostic Trouble Codes (DTCs).

• Using the diagnostic scan tool, active command the cabin heater coolant pump on and allow it to run for a minimum of 5 minutes and monitor the status of the cabin heater coolant pump status PID . Confirm if the cabin heater coolant pump is running by feeling or hearing the pump for vibration.

• Access the  PCM  and control the  COOLANT_PMP_A  PID

• Access the  PCM  and monitor the  COOLPMP_A_STAT  PID

• Ignition OFF.

• Disconnect BJB fuse 12 (15A).

• Disconnect Cabin heater coolant pump C163 .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C163-2		Ground
  C163-3		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C163-2		Ground
  C163-3		Ground

• Disconnect PCM 2.0L C1381B or 2.7L C1551E .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C163-1		Ground

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C163-2		BJB fuse 12 (15A)

  
  Click to display connectors

    2.0L

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C163-3		C1381B-20

  
  Click to display connectors

    2.7L

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C163-3		C1551E-60

• Ignition OFF.

• Disconnect Cabin heater coolant pump C163 .

• Repair:
  • corrosion (replace connector or terminals – clean module pins)
  • damaged or bent pins – replace terminals/pins
  • pushed-out pins – replace pins as necessary

• Connect all disconnected connectors-components. Make sure they seat and latch correctly.

• Ignition ON.

• Using a diagnostic scan tool, CLEAR all PCM Diagnostic Trouble Codes (DTCs) and CARRY OUT the PCM self-test.

• Using the diagnostic scan tool, active command the cabin heater coolant pump on and allow it to run for a minimum of 5 minutes and monitor the status of the cabin heater coolant pump status PID . Confirm if the cabin heater coolant pump is running by feeling or hearing the pump for vibration.

• Access the  PCM  and control the  COOLANT_PMP_A  PID

• Access the  PCM  and monitor the  COOLPMP_A_STAT  PID

• Ignition OFF.

• Disconnect and inspect the PCM connectors.

• Repair:
  • corrosion (replace connector or terminals – clean module pins)
  • damaged or bent pins – replace terminals/pins
  • pushed-out pins – replace pins as necessary

• Connect the PCM connectors. Make sure they seat and latch correctly.

• Operate the system and verify the concern is still present.

Yes	CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,    Click here to access Guided Routine (PCM).

Normal Operation and Fault Conditions

In-Vehicle Temperature and Humidity Sensor, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• In-vehicle temperature and humidity sensor
• HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

• Ignition OFF.

• Disconnect HVAC control module C228A and C228B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228B-29		Ground
  C228B-27		Ground
  C228B-19		Ground
  C228B-9		Ground

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-3		Ground
  C228A-2		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228B-29		Ground
  C228B-27		Ground
  C228B-19		Ground
  C228B-9		Ground

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-3		Ground
  C228A-2		Ground

• Disconnect In-vehicle temperature and humidity sensor C910 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228B-29		C910-1
  C228B-27		C910-2
  C228B-19		C910-4
  C228B-9		C910-6

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-3		C910-3
  C228A-2		C910-5

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors.

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

Evaporator Temperature Sensor, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Evaporator temperature sensor
• HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

• Ignition OFF.

• Disconnect HVAC control module C228A and C228B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-22		Ground
  C228A-2		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-22		Ground
  C228A-2		Ground

• Disconnect Evaporator temperature sensor C296 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-22		C296-1
  C228A-2		C296-2

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C296-1		C296-2

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors.

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

The Driver Temperature Door Actuator, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

During an actuator calibration cycle, the HVAC control module drives the temperature door until the door reaches both internal stops in the HVAC case. If the temperature blend door is temporarily obstructed or binding during a calibration cycle, the HVAC control module can interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be the expected temperature.

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Temperature door actuator
• Temperature door is binding, stuck or slipping
• HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

• Ignition OFF.

• Disconnect HVAC control module C228A and C228B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-8		Ground
  C228A-2		Ground
  C228A-3		Ground
  C228A-10		Ground
  C228A-9		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-8		Ground
  C228A-2		Ground
  C228A-3		Ground
  C228A-10		Ground
  C228A-9		Ground

• Disconnect Driver temperature door actuator C2091 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-8		C2091-1
  C228A-2		C2091-2
  C228A-3		C2091-3
  C228A-10		C2091-4
  C228A-9		C2091-6

• Connect HVAC control module C228A and C228B .

• Ignition ON.

• On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2091-3		Ground

• Ignition OFF.

• Disconnect the HVAC control module connectors.

• Disconnect and inspect the driver temperature door actuator connector.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all disconnected connectors. CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors.

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

The Passenger Temperature Door Actuator, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

During an actuator calibration cycle, the HVAC control module drives the temperature door until the door reaches both internal stops in the HVAC case. If the temperature door is temporarily obstructed or binding during a calibration cycle, the HVAC control module can interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be the expected temperature.

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Temperature door actuator
• Temperature door is binding, stuck or slipping
• HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

• Ignition OFF.

• Disconnect HVAC control module C228A and C228B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-2		Ground
  C228A-3		Ground

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228B-14		Ground
  C228B-18		Ground
  C228B-13		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-2		Ground
  C228A-3		Ground

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228B-14		Ground
  C228B-18		Ground
  C228B-13		Ground

• Disconnect Passenger temperature door actuator C2092 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-2		C2092-2
  C228A-3		C2092-3

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228B-13		C2092-1
  C228B-18		C2092-4
  C228B-14		C2092-6

• Connect HVAC control module C228A and C228B .

• Ignition ON.

• On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2092-3		Ground

• Ignition OFF.

• Disconnect the HVAC control module connectors.

• Disconnect and inspect the passenger temperature door actuator connector.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all disconnected connectors. CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors.

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

Air Inlet Door Actuator

During an actuator calibration cycle, the HVAC control module drives the air inlet mode door until the door reaches both internal stops in the HVAC case. If the air inlet mode door is temporarily obstructed or binding during a calibration cycle, the HVAC control module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the air intake may not be from the expected source.

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Actuator door binding, stuck or slipping
• Air inlet door actuator
• HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

• Ignition OFF.

• Disconnect HVAC control module C228A and C228B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-27		Ground
  C228A-2		Ground
  C228A-3		Ground
  C228A-19		Ground
  C228A-28		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-27		Ground
  C228A-2		Ground
  C228A-3		Ground
  C228A-19		Ground
  C228A-28		Ground

• Disconnect Air inlet mode door actuator C289 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-27		C289-1
  C228A-2		C289-2
  C228A-3		C289-3
  C228A-19		C289-4
  C228A-28		C289-6

• Connect HVAC control module C228A and C228B .

• Ignition ON.

• On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C289-3		Ground

• Ignition OFF.

• Disconnect the HVAC control module connectors.

• Disconnect and inspect the air inlet door actuator connector.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all disconnected connectors. CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors .

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

Air Handling, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

During an actuator calibration cycle, the HVAC control module drives the defrost vent door and the footwell vent/register door until the doors reach both internal stops in the HVAC case. If the defrost vent door or the footwell vent/register door is temporarily obstructed or binding during a calibration cycle, the HVAC control module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be from the expected outlets.

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Actuator doors binding, stuck or slipping
• Air distribution door actuator
• HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

• Ignition OFF.

• Disconnect HVAC control module C228A and C228B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-24		Ground
  C228A-2		Ground
  C228A-3		Ground
  C228A-25		Ground
  C228A-23		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-24		Ground
  C228A-2		Ground
  C228A-3		Ground
  C228A-25		Ground
  C228A-23		Ground

• Disconnect Air distribution door actuator C236 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-24		C236-1
  C228A-2		C236-2
  C228A-3		C236-3
  C228A-25		C236-4
  C228A-23		C236-6

• Connect HVAC control module C228A and C228B .

• Ignition ON.

• On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C236-3		Ground

• Ignition OFF.

• Disconnect the HVAC control module connectors.

• Disconnect and inspect the air distribution door actuator connector.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all disconnected connectors. CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors.

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

When the engine is at operating temperature hot coolant primarily flows from the engine through the heater core and back to the engine. Correct coolant temperatures are critical for good heater performance. A restriction of coolant flow due to a transmission fluid heater coolant control valve (if equipped), or a cabin heater coolant pump (if equipped), may cause poor coolant flow to the heater core.

Possible Sources

• Low engine coolant level
• (If equipped) transmission fluid heater coolant control valve
• (If equipped) cabin heater coolant pump
• Heater core
• Temperature door binding or stuck
• Temperature door actuator

Visual Inspection and Pre-checks

• Inspect for low engine coolant level.

• Ignition OFF.

• Check the engine coolant level.

• Pressure test the cooling system for leaks. Refer to the appropriate section in Group 303 for the procedure.

• Run the engine until it reaches normal operating temperature.

• On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.

• Using a suitable temperature measuring device, check the temperature of the heater core inlet hose.

• Using a suitable temperature measuring device, measure the temperature of the heater core outlet hose.

• INSTALL a temporary bypass hose from the heater core outlet to the thermostat housing assembly (as applicable).

• Using a suitable temperature measuring device, measure the heater core inlet and outlet hose temperatures.

Normal Operation and Fault Conditions

When an A/C request is received by the PCM , the A/C clutch is engaged when all of the following conditions are met:

• Excessively high or low refrigerant pressure from the A/C pressure transducer is not detected.
• Ambient air temperature is above approximately 0°C (32.0°F).
• Evaporator temperature is above approximately 1°C (33.8°F).
• Engine coolant temperature conditions are within normal parameters.
• Wide Open Throttle (WOT) condition is not present.
• Engine torque conditions are within normal parameters.
• Battery state of charge conditions are within normal parameters.

For more information on A/C Request, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

Possible Sources

• Wiring, terminals or connectors
• A/C system discharged or low refrigerant charge
• Network concerns
• A/C pressure transducer
• Evaporator temperature sensor
• Engine temperature sensors
• A/C compressor clutch air gap
• A/C compressor clutch field coil
• A/C clutch relay [non-serviceable, part of the BJB ]
• HVAC control module

Visual Inspection and Pre-checks

• Inspect BJB fuse 22 (10A)
• Verify the A/C compressor belt is OK.
• Verify the A/C compressor clutch is engaged/operating.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Some Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs) may inhibit Air Conditioning (A/C) operation. If any Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs) are retrieved, diagnose those first. Refer to the Diagnostic Trouble Code (DTC) Chart.

• Start the engine. Observe the outside temperature display for proper operation.

• On the HVAC controls, set the temperature to full cold, select PANEL and select the A/C button (indicator on).

• Ignition OFF.

• Wait 1 minute.

• Ignition ON.

• Using the FDRS diagnostic scan tool, follow the on screen prompts to reset the Outside Air Temperature (OAT)/Ambient Air Temperature (AAT) sensor data.
  REFER to: Reset the Outside Air Temperature Sensor Learned Values (412-00 Climate Control System - General Information, General Procedures).
  

• Start the engine.

• On the HVAC controls, set the temperature to full cold, select PANEL and select the A/C button (indicator on).

NOTE: Static refrigerant pressure, under perfect conditions, should approximately reflect ambient air temperature. Do not rely upon the static refrigerant pressure alone to determine if the system is properly charged. Refer to the current Ford Web Based Technical Training courses for basic HVAC system refrigerant operation.

• Ignition OFF.

• Connect a manifold gauge set.

• With a manifold gauge set connected, check for minimum A/C system pressure.

• Ignition ON.

• Using a diagnostic scan tool, carry out the network test.

NOTE: The following pinpoint test step is tested in ambient temperature of approximately 21.1°C (70°F). As ambient temperatures near 38°C (100.4°F), the pressure value difference increases above ± 15 psi (103 kPa) range.

• With a manifold gauge set connected, compare the pressure readings of the manifold gauge set and the

  Access the  PCM  and monitor the  ACP_PRESS (kPa)  PID

• Ignition OFF. Allow the vehicle exterior and interior to stabilize to ambient temperature. This can take a soak period of at least 6 hours.

• Ignition ON.

• Using a diagnostic scan tool, monitor and record the

  Access the  PCM  and monitor the  AAT (Deg C)  PID

• Using a diagnostic scan tool, monitor and record the

  Access the  HVAC  and monitor the  EVAP_TEMP (Deg C)  PID

NOTE: Compare multiple engine sensor readings to the ambient temperature to determine sensors are reading correctly. A faulty sensor can cause the Powertrain Control Module (PCM) to disable the Air Conditioning (A/C) with or without a Diagnostic Trouble Code (DTC).

• Monitor the temperature Parameter Identifications (PIDs) (as applicable):

  • Access the  PCM  and monitor the  AAT (Deg C)  PID

  • Access the  PCM  and monitor the  CAC_T (Deg C)  PID

  • Access the  PCM  and monitor the  CHT (Deg C)  PID

  • Access the  PCM  and monitor the  ECT (Deg C)  PID

  • Access the  PCM  and monitor the  IAT (Deg C)  PID

  • Access the  PCM  and monitor the  IAT2 (Deg C)  PID

• Access the  HVAC  and monitor the  CC_SW_AC  PID

• On the HVAC controls, select PANEL and then press the A/C button (indicator ON).

• Start the engine.

• Access the  PCM  and monitor the  AC_REQ  PID

• On the HVAC controls, select PANEL and then press the A/C button (indicator ON).

• Access the  PCM  and control the  ACC_CMD  PID

• Ignition OFF.

• Disconnect BJB C1035A .

• Disconnect PCM C1381B or C1551B .

• Measure:
  Click to display connectors

    2.0L

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035A-37		C1381B-62

  
  Click to display connectors

    2.7L

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035A-37		C1551B-19

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C100-2		Ground

• Disconnect A/C clutch field coil C1680 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035A-45		C1680-1

• Connect PCM C1381B or C1551B .

• Connect BJB C1035A .

• Ignition ON.

• Access the  PCM  and control the  ACC_CMD  PID

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1680-1		Ground

• Measure the A/C compressor clutch air gap at 3 equally spaced locations between the clutch hub and the A/C compressor clutch pulley. REFER to the appropriate General Procedure in Group 412-00.

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

NOTE: The Powertrain Control Module (PCM) strategy may disable the Air Conditioning (A/C) compressor operation. If the A/C compressor clutch can be commanded on using a diagnostic scan tool Powertrain Control Module (PCM) Parameter Identifications (PIDs) Active Commands, Powertrain Control Module (PCM) replacement will not resolve the condition.

• Diagnose the PCM not energizing the A/C clutch relay using the suggestions in the table below.

  A/C Clutch Engagement is inhibited because strategy has not yet detected hardware that indicates vehicle is equipped with A/C

  A/C Clutch Engagement is inhibited because the strategy is operating in Ignition System Failure Mode

  A/C Clutch Engagement is inhibited because the (ECU) received a Request to Command the A/C Off

  A/C Clutch Engagement is inhibited because the engine has not yet reached a stable running mode after starting

  A/C Clutch Engagement is inhibited because the A/C Discharge (Head) Pressure is Too High

  A/C Clutch Engagement is inhibited because the Engine Coolant Temperature is Too High

  A/C Clutch Engagement is inhibited to Prevent Frost and Ice Build Up on the Evaporator

  A/C Clutch Engagement is inhibited to Prevent an Engine Stall during a Low Engine Speed condition

  A/C Clutch Engagement is inhibited to Protect the Compressor from a Compressor Over-speed condition

  A/C Clutch Engagement is inhibited to temporarily make more power available when Accelerator Pedal is Fully Depressed

  A/C Clutch Engagement is inhibited because Low A/C Refrigerant Charge has been detected

  A/C Clutch Engagement is inhibited to Protect the Compressor from Operating at Too Low of an Ambient Temperature

  A/C Clutch Engagement is inhibited due to Missing Climate Control Message

  A/C Clutch Engagement is inhibited because the strategy is operating in Failsafe Cooling Mode

  A/C Clutch Engagement is inhibited to Protect the Clutch from Damage because the Compressor Load and Speed are Too High

  A/C Clutch Engagement is inhibited by the off portion of the A/C Cycling Strategy invoked to manage High Engine Temperature

  A/C Clutch Engagement is inhibited due to Low Battery State of Charge

  A/C Clutch Engagement is inhibited to Protect the Variable Displacement Compressor from Operating at Too Low of a Temperature

  A/C Clutch Engagement is inhibited to improve Brake Booster Vacuum

  A/C Clutch Engagement is inhibited because Evaporator Temperature is sufficiently low and compressor was at minimum displacement

  A/C Clutch Engagement is inhibited (Disabled) because the Evaporator Temperature is sufficiently below the target temperature

  A/C Clutch Engagement is inhibited to satisfy A/C Clutch minimum off time

  A/C Clutch Engagement is inhibited Due to Request from Torque Control Strategy (to Temporarily Make More Power Available)

  A/C Clutch Engagement is inhibited to Prevent Engine Stalling

  A/C Clutch Engagement is inhibited Due to Request to Disable A/C from Stop-Start Strategy

  A/C Clutch Engagement is inhibited (Delayed) to make Power Available for Power Steering

  A/C Clutch Engagement Is Inhibited Due To State Of Auxiliary A/C Disable (Typically A Pressure Or Temperature) Switch 1 input

  A/C Clutch Engagement is inhibited due to state of auxiliary A/C Disable (Typically a Pressure or Temperature) Switch 2 input

Normal Operation and Fault Conditions

A/C Request, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• A/C pressure transducer
• Evaporator temperature sensor
• HVAC control module
• PCM

Visual Inspection and Pre-checks

• Inspect for loose or corroded PCM or HVAC control module connections.

• Ignition ON.

• Make sure the HVAC control module is powered off.

• Using a diagnostic scan tool, clear the PCM Diagnostic Trouble Codes (DTCs).

• Using a diagnostic scan tool, carry out the PCM self-test.

• Ignition OFF.

• Disconnect A/C clutch field coil C100 .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C100-1		Ground

• Ignition OFF.

• Allow the vehicle exterior and interior to stabilize to ambient temperature. This can take a soak period of at least 6 hours.

• Ignition ON.

• Monitor and record the

  Access the  PCM  and monitor the  AAT (Deg C)  PID

• Monitor and record the

  Access the  HVAC  and monitor the  EVAP_TEMP (Deg C)  PID

NOTE: The following pinpoint test step is tested in ambient temperature of approximately 21.1°C (70°F). As ambient temperatures near 38°C (100.4°F), the pressure value difference increases above ± 15 psi (103 kPa) range.

• Ignition ON.

• With a manifold gauge set connected, compare the pressure readings of the manifold gauge set and the PCM Parameter Identification (PID) ACP_PRESS.

• Ignition ON.

• Access the  HVAC  and monitor the  CC_SW_AC  PID

• Using the HVAC controls, select PANEL then press and release the A/C button (indicator off).

• Access the  PCM  and monitor the  AC_REQ  PID

• Using the HVAC controls, deactivate the A/C .

• Ignition OFF.

• Disconnect HVAC control module C228A and C228B .

• Ignition ON.

• Access the  PCM  and monitor the  AC_REQ  PID

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all PCM electrical connectors (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all PCM electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Yes	CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,    Click here to access Guided Routine (PCM).

Normal Operation and Fault Conditions

Air Handling, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Fuse
• Wiring, terminals or connectors
• Blower motor relay [non-serviceable, part of the BJB ]
• Blower motor control module
• HVAC control module

Visual Inspection and Pre-checks

• Make sure BJB fuse 79 (40A) is OK.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

• Ignition OFF.

• Disconnect BJB C1035A .

• Disconnect HVAC control module C228A and C228B .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-11		Ground

NOTE: Some vehicles may be equipped with a diode in the blower motor relay coil ground circuit. Make sure the multimeter leads are correctly attached during testing or a false reading will occur causing misdiagnosis of the circuit. For additional information, refer to the Wiring Diagrams manual.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-11		C1035A-31

• Disconnect Blower motor speed control C297A .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C297-6		C1035A-3

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C297-5		Ground

• Connect BJB C1035A .

• Connect HVAC control module C228A and C228B .

• Ignition ON.

• Select PANEL on the HVAC controls.

• Select the highest blower motor setting.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C297-6		C297-5

• Ignition OFF.

• Disconnect HVAC control module C228A and C228B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C297-3		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C297-3		C228A-26

• Ignition OFF.

• Disconnect and inspect all blower motor speed control connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Connect all the blower motor speed control connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

Air Handling, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Blower motor speed control
• HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

• Ignition ON.

• Select PANEL on the HVAC controls. Adjust the blower motor setting to the minimum and maximum settings.

• Ignition OFF.

• Disconnect HVAC control module C228A and C228B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-11		Ground

• Ignition OFF.

• Disconnect Blower motor speed control C297A .

• Disconnect BJB fuse 79 (40A).

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C297-6		Ground

• Ignition OFF.

• Disconnect and inspect all blower motor speed control connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Connect all the blower motor speed control connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

The HVAC control module communicates with the BCM over the CAN . If messages are missing or not received from the BCM , the climate control system may not operate not operate correctly. REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

Inspect for loose or corroded BCM and HVAC control module connections.

DTC Fault Trigger Conditions

Possible Sources

• Network communication concern
• Wiring, terminals or connectors
• Over or undervoltage concerns
• HVAC control module
• BCM

• Ignition ON.

• Verify there is an observable symptom present.

• Using a diagnostic scan tool, carry out the network test.

• Using a diagnostic scan tool, carry out the self-test for the module in question (HVAC control module) setting the DTC .

• Using a diagnostic scan tool, carry out the BCM self-test.

• Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs) for the module in question (ACCM , HVAC control module) setting the DTC .

• Ignition OFF.

• Ignition ON.

• Wait 10 seconds.

• Using a diagnostic scan tool, carry out the self-test for the module in question (ACCM , HVAC control module) setting the DTC .

NOTE: If new modules were installed prior to the Diagnostic Trouble Code (DTC) being set, the module configuration can be incorrectly set during the Programmable Module Installation (PMI) or the Programmable Module Installation (PMI) may not have been carried out.

• Check the vehicle service history for recent service actions related to the BCM and the module in question ( HVAC control module) setting the DTC . If recent service history is found:
  • verify correct replacement module was installed
    • vehicle parts build list may be used to verify correct part fitment
  • verify the configuration of replacement module was correct
    • re-configure module using as-built data if prior configuration is suspect
  • verify the module was not obtained from a like vehicle and installed into vehicle with concern
    • return the swapped module to source vehicle and obtain new replacement module

• Operate the system and determine if the observable symptom is still present.

• Ignition OFF.

• Disconnect and inspect all BCM electrical connectors (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all BCM electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

Control Logic, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Vehicle communication bus
• RCM
• HVAC control module

• Ignition ON.

• Verify there is an observable symptom present.

• Using a diagnostic scan tool, carry out the network test.

• Using a diagnostic scan tool, carry out the RCM self-test.

• Using a diagnostic scan tool, carry out the HVAC control module self-test.

NOTE: If new modules were installed prior to the Diagnostic Trouble Code (DTC) being set, the module configuration can be incorrectly set during the Programmable Module Installation (PMI) or the Programmable Module Installation (PMI) may not have been carried out.

• Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).

• Ignition OFF.

• Ignition ON.

• Wait 10 seconds.

• Using a diagnostic scan tool, carry out the HVAC control module self-test.

• Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

• Ignition OFF.

• Ignition ON.

• Wait 10 seconds.

• Using a diagnostic scan tool, retrieve all continuous memory Diagnostic Trouble Codes (DTCs).

• Ignition OFF.

• Disconnect and inspect the RCM electrical connector (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect RCM electrical connector. Make sure it seats and latches correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly. WAIT 20 seconds for the range calibration to be executed after reconnecting of the module before any further assessment or measurement is made. If the actuator range calibration does not start, or has been interrupted, PERFORM the HVAC Calibration Routine, using a diagnostic scan tool.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

With the ignition ON, the IPC sends messages to the HVAC control module over the MS-CAN . If the HVAC control module does not receive these messages within the specified time frame, the module sets a DTC . This can be due to an IPC failure, a circuit failure on the MS-CAN or an excessive load on the network. For information on the messages sent to the HVAC control module by the IPC , REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Network communication concern
• Wiring, terminals or connectors
• Over or undervoltage concerns
• IPC
• HVAC control module

• Ignition ON.

• Verify there is an observable symptom present.

• Using a diagnostic scan tool, carry out the network test.

• Using a diagnostic scan tool, carry out the IPC self-test.

• Using a diagnostic scan tool, carry out the HVAC control module self-test.

NOTE: If new modules were installed prior to the Diagnostic Trouble Code (DTC) being set, the module configuration can be incorrectly set during the Programmable Module Installation (PMI) or the Programmable Module Installation (PMI) may not have been carried out.

• Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).

• Ignition OFF.

• Ignition ON.

• Wait 10 seconds.

• Using a diagnostic scan tool, carry out the HVAC control module self-test.

• Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

• Ignition OFF.

• Ignition ON.

• Wait 10 seconds.

• Using a diagnostic scan tool, retrieve all continuous memory Diagnostic Trouble Codes (DTCs).

• Ignition OFF.

• Disconnect and inspect the IPC electrical connector (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect IPC electrical connector. Make sure it seats and latches correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

Control Logic, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Vehicle communication bus
• APIM
• HVAC control module

• Ignition ON.

• Verify there is an observable symptom present.

• Using a diagnostic scan tool, carry out the network test.

• Using a diagnostic scan tool, carry out the APIM self-test.

• Using a diagnostic scan tool, carry out the HVAC control module self-test.

NOTE: If new modules were installed prior to the Diagnostic Trouble Code (DTC) being set, the module configuration can be incorrectly set during the Programmable Module Installation (PMI) or the Programmable Module Installation (PMI) may not have been carried out.

• Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).

• Ignition OFF.

• Ignition ON.

• Wait 10 seconds.

• Using a diagnostic scan tool, carry out the HVAC control module self-test.

• Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

• Ignition OFF.

• Ignition ON.

• Wait 10 seconds.

• Using a diagnostic scan tool, retrieve all continuous memory Diagnostic Trouble Codes (DTCs).

• Ignition OFF.

• Disconnect and inspect the APIM electrical connector (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect APIM electrical connector. Make sure it seats and latches correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

The HVAC control module uses solid state drivers Field Effect Transistors (FET) to control the output of climate control systems. When an overload occurs on any of these drivers, the module disables the output and tracks the number of repetitive faults on each of these circuits. The module compares this number of overloads to three progressive thresholds established for each circuit. At each threshold, DTC U1000:00 sets along with the DTC associated with the affected circuit. For additional HVAC control module Field-Effect Transistor (FET) information, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals, or connectors
• HVAC control module output circuit short
• HVAC control module

• Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).

• Ignition OFF.

• Ignition ON.

• Wait 10 seconds.

• Using a diagnostic scan tool, carry out the HVAC control module self-test.

Normal Operation and Fault Conditions

The air discharge sensors supply a varying voltage to the HVAC control module based on the temperature of the air being discharged from the vent. The HVAC control module adjusts the system based on the voltage from each sensor.

Each air discharge sensor is supplied voltage from the HVAC control module and all sensors share a common sensor ground. An open, a short to ground, a short to voltage on one or more of these circuits or a failed air discharge sensor causes the HVAC control module to set one or more Diagnostic Trouble Codes (DTCs).

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Air discharge temperature sensor
• HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

• Ignition OFF.

• Disconnect the suspect air discharge temperature sensor:
  • Driver Side Footwell (Floor) Air Discharge Temperature Sensor C2436
  • Passenger Side Footwell (Floor) Air Discharge Temperature Sensor C2437
  • Driver Side Register (Panel) Air Discharge Temperature Sensor C2438
  • Passenger Side Register (Panel) Air Discharge Temperature Sensor C2439

• Ignition ON.

• On the HVAC controls, select PANEL mode.

• For the Driver Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2436-1		C2436-3

• For the Passenger Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2437-1		C2437-3

• For the Driver Side Register (Panel) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2438-1		C2438-3

• For the Passenger Side Register (Panel) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2439-1		C2439-3

• Ignition OFF.

• Disconnect HVAC control module C228A and C228B .

• Ignition ON.

• For the Driver Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2436-1		Ground
  C2436-3		Ground

• For the Passenger Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2437-1		Ground
  C2437-3		Ground

• For the Driver Side Register (Panel) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2438-1		Ground
  C2438-3		Ground

• For the Passenger Side Register (Panel) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2439-1		Ground
  C2439-3		Ground

• Ignition OFF.

• For the Driver Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2436-1		Ground
  C2436-3		Ground

• For the Passenger Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2437-1		Ground
  C2437-3		Ground

• For the Driver Side Register (Panel) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2438-1		Ground
  C2438-3		Ground

• For the Passenger Side Register (Panel) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2439-1		Ground
  C2439-3		Ground

• For the Driver Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2436-1		C228B-5

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2436-3		C228A-2

• For the Passenger Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2437-1		C228B-11

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2437-3		C228A-2

• For the Driver Side Register (Panel) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2438-1		C228B-4

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2438-3		C228A-2

• For the Passenger Side Register (Panel) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2439-1		C228B-10

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2439-3		C228A-2

• For the Driver Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2436-1		C2436-3

• For the Passenger Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2437-1		C2437-3

• For the Driver Side Register (Panel) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2438-1		C2438-3

• For the Passenger Side Register (Panel) Air Discharge Temperature Sensor, measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2439-1		C2439-3

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

The sunload sensor supplies information to the HVAC control module indicating the sunload intensity on the vehicle and the HVAC control module adjusts the system based on that information.

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Autolamp and sunload sensor
• HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

• Ignition OFF.

• Disconnect Autolamp Sunload Sensor C286 .

• Disconnect HVAC control module C228A and C228B .

• Ignition ON.

• Disconnect BCM C2280G .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C286-1		Ground
  C286-2		Ground
  C286-3		Ground
  C286-4		Ground

• Connect BCM C2280G .

• Ignition OFF.

• Disconnect BCM C2280G .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C286-1		Ground
  C286-2		Ground
  C286-3		Ground
  C286-4		Ground

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C286-1		C228B-22
  C286-3		C228B-21

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C286-2		C2280G-24
  C286-4		C2280G-22

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C286-1		C286-2
  C286-1		C286-3
  C286-1		C286-4
  C286-2		C286-3
  C286-2		C286-4
  C286-3		C286-4

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

The PCM controls the A/C compressor clutch field coil based on messages received from the BCM over the HS-CAN1 through the GWM . When the HVAC control module determines it is necessary to activate the A/C compressor, either due to driver request or due to automatic climate control settings, the HVAC control module sends a message to the BCM over the MS-CAN , the BCM then sends a message to the PCM to activate the A/C compressor.

An internal failure of the PCM , BCM or HVAC control module; or a failure in the MS-CAN or HS-CAN1 causes the PCM to set a DTC .

DTC Fault Trigger Conditions

Possible Sources

• Network concerns
• BCM
• PCM
• HVAC control module

• Ignition ON.

• Verify there is an observable symptom present.

• Using a diagnostic scan tool, carry out the network test.

• Start the engine.

• Using a diagnostic scan tool, monitor the

  Access the  PCM  and monitor the  AC_REQ  PID

• On the HVAC controls, select PANEL mode, then press the A/C button (indicator ON).

• Using a diagnostic scan tool, monitor the

  Access the  HVAC  and monitor the  CC_SW_AC  PID

  while pressing and releasing the A/C button.

• Ignition OFF.

• Disconnect and inspect all HVAC control module electrical connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals or pins
  • pushed-out pins – install new pins as necessary

• Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all BCM electrical connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals or pins
  • pushed-out pins – install new pins as necessary

• Connect all BCM electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all PCM electrical connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals or pins
  • pushed-out pins – install new pins as necessary

• Connect all PCM electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Yes	CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,    Click here to access Guided Routine (PCM).

Normal Operation and Fault Conditions

Reference voltage is supplied to the climate control actuators and one sensor from the HVAC control module on one common circuit and the signal returns to the HVAC control module on one common circuit. All components that share these two circuits are listed in this pinpoint test. Access to these components are difficult.

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition ON.

• Using a diagnostic scan tool, carry out the HVAC control module self-test.

• Ignition OFF.

• Disconnect HVAC control module C228A and C228B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C228A-3		Ground
  C228A-2		Ground