Lincoln Nautilus: Voltage Converter/Inverter / Direct Current/Direct Current (DC/DC) Converter Control Module. Diagnosis and Testing

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

  Direct Current/Direct Current (DC/DC) Converter Control Module DTC Chart

Symptom Chart

Pinpoint Test(s)

P0A12:11

Refer to Wiring Diagrams Cell 40 for schematic and connector information.

Normal Operation and Fault Conditions

During an auto-start-stop event, the PCM sends a voltage signal to the Direct Current/Direct Current (DC/DC) converter control module through the boost enable circuit. If the PCM boost enable circuit becomes shorted to ground, or is low for more than 60 seconds DTC P0A12:11 sets and the Direct Current/Direct Current (DC/DC) converter control module will not boost. If the enable circuit becomes open, the Direct Current/Direct Current (DC/DC) converter control module will not receive a re-crank signal from the PCM and the Direct Current/Direct Current (DC/DC) converter control module will not boost. Any systems powered through the Direct Current/Direct Current (DC/DC) converter control module may restart during an auto-start-stop event. For more information on the auto-start-stop system,
REFER to: Starting System - System Operation and Component Description (303-06A Starting System - 2.0L EcoBoost (184kW/250PS) – MI4, Description and Operation).

  Diagnostic Trouble Code (DTC) Fault Trigger Conditions

Possible Sources

• Direct Current/Direct Current (DC/DC) converter control module
• PCM
• Wiring, terminals or connectors

NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

A1 CHECK DIRECT CURRENT/DIRECT CURRENT (DC/DC) CONVERTER ENABLE CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF. Disconnect Low Voltage Direct Current/Direct Current (DC/DC) converter C2513 . Disconnect PCM C1381B (2.0L EcoBoost). Disconnect PCM C1551B (2.7L EcoBoost). Ignition ON. Measure: Click to display connectors Positive Lead Measurement / Action Negative Lead   C2513-2   Ground Is any voltage present? Yes REPAIR the circuit. No GO to A2

A2 CHECK DIRECT CURRENT/DIRECT CURRENT (DC/DC) CONVERTER ENABLE CIRCUIT FOR A SHORT TO GROUND

Ignition OFF. Measure: Click to display connectors Positive Lead Measurement / Action Negative Lead   C2513-2   Ground Is the resistance greater than 10,000 ohms? Yes GO to A3 No REPAIR the circuit.

A3 CHECK DIRECT CURRENT/DIRECT CURRENT (DC/DC) CONVERTER ENABLE CIRCUIT FOR AN OPEN

Measure: Click to display connectors   For 2.0L EcoBoost Positive Lead Measurement / Action Negative Lead   C2513-2   C1381B-68 Click to display connectors   For 2.7L EcoBoost Positive Lead Measurement / Action Negative Lead   C2513-2   C1551B-49 Is the resistance less than 3 ohms? Yes GO to A4 No REPAIR the circuit.

A4 PERFORM THE PCM (POWERTRAIN CONTROL MODULE) SELF TEST

Connect PCM C1381B (2.0L EcoBoost). Connect PCM C1551B (2.7L EcoBoost). Connect Low Voltage Direct Current/Direct Current (DC/DC) converter C2513 . Ignition ON. Using a diagnostic scan tool, perform the PCM self-test. Are any PCM Diagnostic Trouble Codes (DTCs) present? Yes For DTC U0298:00, DIAGNOSE the network communication concern. REFER to: Communications Network (418-00 Module Communications Network) . For all other PCM Diagnostic Trouble Codes (DTCs), REFER to: Electronic Engine Controls (303-14 Electronic Engine Controls) . No GO to A5

A5 CHECK DIRECT CURRENT/DIRECT CURRENT (DC/DC) CONVERTER DIAGNOSTIC TROUBLE CODES (DTCS) WITH THE PCM (POWERTRAIN CONTROL MODULE) DISCONNECTED

Disconnect PCM C1381B (2.0L EcoBoost). Disconnect PCM C1551B (2.7L EcoBoost). Ignition ON. Using a diagnostic scan tool, clear the Low Voltage Direct Current/Direct Current (DC/DC) converter Diagnostic Trouble Codes (DTCs). Using a diagnostic scan tool, perform the Low Voltage Direct Current/Direct Current (DC/DC) converter self-test. Is DTC P0A12:11 retrieved? Yes GO to A6 No GO to A7

A6 CHECK FOR CORRECT DIRECT CURRENT/DIRECT CURRENT (DC/DC) CONVERTER OPERATION

Ignition OFF. Disconnect Direct Current/Direct Current (DC/DC) converter control module C2513 . Inspect and 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 connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new Direct Current/Direct Current (DC/DC) converter control module. REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module (414-05 Voltage Converter/Inverter, Removal and Installation). No The system is operating correctly at this time. The concern may have been caused by module connections. Address the root cause of any connector or pin issues.

A7 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF. Disconnect and inspect all PCM 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 Reconnect all connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no Technical Service Bulletins (TSBs) address this concern,    Click here to access Guided Routine (PCM). No The system is operating correctly at this time. The concern may have been caused by module connections. Address the root cause of any connector or pin issues.

B1310:11

Refer to Wiring Diagrams Cell 40 for schematic and connector information.

Normal Operation and Fault Conditions

The Direct Current/Direct Current (DC/DC) converter control module measures the current draw on the run/start switched output circuit. If the Direct Current/Direct Current (DC/DC) converter control module detects a short to ground or if the current draw exceeds 8 amps the DTC B1310:11 sets and the switching transistor is disabled for the current ignition cycle. A excessive number of shorts to ground or current draw events will set DTC U1000:00 and the switching transistor is disabled until it is reset using a diagnostic scan tool. Presence of this DTC may result in the blind spot detection and video camera being inoperative.

  DTC Fault Trigger Conditions

Possible Sources

• Direct Current/Direct Current (DC/DC) converter control module
• CADS (collision avoidance detection system module)
• IPMB
• Front Parking Aid Camera
• Rear Parking Aid Camera
• SODL
• SODR
• Wiring, terminals or connectors

B1310:15

Refer to Wiring Diagrams Cell 40 for schematic and connector information.

Normal Operation and Fault Conditions

The Direct Current/Direct Current (DC/DC) converter control module measures the current draw on the run/start switched output circuit. If the current draw is less than expected this indicates the circuit is shorted to battery or open. If a failure is present during Direct Current/Direct Current (DC/DC) converter control module initialization at key on it is disabled until the next ignition cycle. Presence of this DTC may result in the blind spot detection and video camera module being inoperative.

  DTC Fault Trigger Conditions

Possible Sources

• Direct Current/Direct Current (DC/DC) converter control module
• Wiring, terminals or connectors

U1000:00

Refer to Wiring Diagrams Cell 13 for schematic and connector information.

Normal Operation and Fault Conditions

The Direct Current/Direct Current (DC/DC) converter control module measures the current draw on the run/start switched output circuit on pin 5. If the Direct Current/Direct Current (DC/DC) converter control module detects a short to ground the switching transistor is disabled for the current ignition cycle. An excessive number of shorts to ground or current draw events will set DTC U1000:00 and the switching transistor will be disabled until it is reset using a diagnostic scan tool. Presence of this DTC may result in the blind spot detection and video camera being inoperative.

  DTC Fault Trigger Conditions

Possible Sources

• Direct Current/Direct Current (DC/DC) converter control module
• Wiring, terminals or connectors

U0100:87

Refer to Wiring Diagrams Cell 40 for schematic and connector information.

Normal Operation and Fault Conditions

The Direct Current/Direct Current (DC/DC) converter control module communicates with the PCM over a High Speed Controller Area Network (HS-CAN) to send and receive important vehicle data.

When powered on, the Direct Current/Direct Current (DC/DC) converter control module continually monitors the High Speed Controller Area Network (HS-CAN). If communication with a module is lost, the Direct Current/Direct Current (DC/DC) converter control module sets the appropriate DTC .

Possible Sources

• Network traffic
• Direct Current/Direct Current (DC/DC) converter control module
• PCM

  DTC Fault Trigger Conditions

E1 CHECK THE COMMUNICATION NETWORK

Ignition ON. Using a diagnostic scan tool, perform a network test. Does the PCM pass the network test? Yes GO to E2 No DIAGNOSE the scan tool communication with the PCM concern. REFER to: Communications Network (418-00 Module Communications Network) .

E2 CHECK THE DIRECT CURRENT/DIRECT CURRENT (DC/DC) CONVERTER CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)

Using a diagnostic scan tool, perform the Direct Current/Direct Current (DC/DC) converter control module self-test. Using a diagnostic scan tool, clear the Direct Current/Direct Current (DC/DC) converter control module Diagnostic Trouble Codes (DTCs). Wait 10 seconds. Using a diagnostic scan tool, perform the Direct Current/Direct Current (DC/DC) converter control module self-test. Is DTC U0100:87 retrieved? Yes GO to E3 No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

E3 RETRIEVE THE DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE PCM (POWERTRAIN CONTROL MODULE)

Using a diagnostic scan tool, perform the PCM self-test. Is DTC P0562:00 or P0563:00 recorded? Yes DIAGNOSE the PCM DTC . REFER to: Electronic Engine Controls (303-14 Electronic Engine Controls) . No GO to E4

E4 CHECK FOR A LOST COMMUNICATION WITH THE PCM (POWERTRAIN CONTROL MODULE) IN OTHER MODULES

Using a diagnostic scan tool, retrieve Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules. Is DTC U0100:00 or U0100:87 set in multiple modules? Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no Technical Service Bulletins (TSBs) address this concern,    Click here to access Guided Routine (PCM). No CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new Direct Current/Direct Current (DC/DC) converter control module. REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module (414-05 Voltage Converter/Inverter, Removal and Installation).