Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC PRIORITY
1. Start the engine and let it idle for 1 minute.
2. Connect CONSULT and check for ENGINE diagnostic trouble codes.
3. Are any of the following displayed as current or have high past counts on the CONSULT screen:
  - P009C-00
  - P009D-00
  - P0667-00
Is applicable DTC detected?

YES

Refer to DTC Index .

NO

GO TO 2 .
CHECK DTC PRIORITY
1. Turn ignition switch ON.
2. Connect CONSULT and check for ENGINE diagnostic trouble codes.
3. Check for DTC P0257-00 being current on the CONSULT screen.
Is DTC P0257-00 detected as current?

YES

GO TO 3 .

NO

Refer to Intermittent Incident .
INSPECT FUEL PRESSURE RELIEF VALVE AND CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect fuel pressure relief valve harness connector F122.
3. Inspect the harness connector and fuel pressure relief valve pins for the following:
  - Loose connector
  - Corroded pins
  - Bent or broken pins
  - Pushed back or expanded pins
  - Moisture in or on the connector
  - Missing or damaged connector seals
  - Dirt or debris on or in the connector pins
  - Connector shell broken
  - Wire insulation damage
  - Damaged connector locking tab
Is the inspection result normal?

YES

GO TO 4 .

NO

Repair or replace error-detected parts.
CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch OFF.
2. Disconnect fuel pressure relief valve harness connector F122.
3. Turn ignition switch ON and wait 30 seconds.
4. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Did DTC P009D-00 become current and P0257-00 become past?

YES

GO TO 5 .

NO

GO TO 7 .
CHECK DTCS AND SENSOR CONDITION
1. Turn ignition switch OFF.
2. Connect fuel pressure relief valve harness connector F122.
3. Turn ignition switch ON and wait 30 seconds.
4. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Did DTC P0257-00 become current?

YES

GO TO 6 .

NO

The removal and installation of the connector corrected the malfunction.
CHECK FUEL PRESSURE RELIEF VALVE
1. Turn ignition switch ON.
2. Using CONSULT, perform High Fuel Pressure Actuator Test.
Is the inspection result normal?

YES

Replace the ECM. Refer to Removal and Installation .

NO

Replace the fuel pressure relief valve. Refer to Removal and Installation .
INSPECT ECM AND HARNESS CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector F101.
3. Inspect the ECM connector pins for the following:
  - Loose connector
  - Corroded pins
  - Bent or broken pins
  - Pushed back or expanded pins
  - Moisture in or on the connector
  - Missing or damaged connector seals
  - Dirt or debris on or in the connector pins
  - Connector shell broken
  - Wire insulation damage
  - Damaged connector locking tab
Is the inspection result normal?

YES

GO TO 8 .

NO

Repair or replace error-detected parts.
CHECK THE ECM RESPONSE
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector F101.
3. Turn ignition switch ON and wait 30 seconds.
4. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Did DTC P009D-00 become current and P0257-00 become past?

YES

Repair or replace the engine harness for a short.

NO

Replace ECM. Refer to Removal and Installation .