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. Turn ignition switch ON.
2. Connect CONSULT and check for ENGINE diagnostic trouble codes.
3. Check for DTC P040C-00 and P040D-00 being current on the CONSULT screen.
Is applicable DTC detected?

YES

DTC P040C and P040D. Refer to Diagnosis Procedure or Diagnosis Procedure .

NO

GO TO 2 .
INSPECT EGR TEMPERATURE SENSOR AND CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect EGR temperature sensor connector F142 from engine harness connector.
3. Inspect the engine harness and EGR temperature sensor 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 3 .

NO

Repair or replace error-detected parts.
CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch OFF.
2. Disconnect the EGR temperature sensor connector F142 from the engine harness.
3. Turn ignition switch ON and wait 30 seconds.
4. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Did DTC P040D-00 become current?

YES

GO TO 4.

NO

GO TO 5 .
CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch OFF.
2. Connect a jumper wire between EGR temperature sensor connector F142 return terminal 2 and signal circuit terminal 1.
3. Turn ignition switch ON and wait 30 seconds.
4. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Did DTC P040C-00 become current?

YES

Replace the EGR temperature sensor. Refer to Removal and Installation .

NO

GO TO 5 .
INSPECT ECM AND ENGINE HARNESS CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect ECM from engine 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 6 .

NO

Repair or replace error-detected parts.
CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch OFF.
2. Disconnect the engine harness connector F101 from the ECM.
3. Turn ignition switch ON and wait 30 seconds.
4. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Did DTC P040D-00 become current?

YES

GO TO 7 .

NO

Replace ECM. Refer to Removal and Installation .
CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch OFF.
2. Disconnect EGR temperature sensor connector F142 from the engine harness.
3. Connect a jumper wire between EGR temperature return terminal 1 and signal circuit terminal 2 at the ECM connector F101.
4. Turn ignition switch ON and wait 30 seconds.
5. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Did DTC P040C-00 become current?

YES

Repair or replace the engine harness for an open or short.

NO

Replace ECM. Refer to Removal and Installation .