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 U010E-00 being current on the CONSULT screen.
Is DTC U010E-00 detected as current?

YES

Refer to DTC Index .

NO

GO TO 2 .
INSPECT DEF CONTROL MODULE AND HARNESS CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect DEF control module harness connector C35.
3. Inspect the DEF control module 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 DEF control module harness connector C35.
3. Turn ignition switch ON and wait 30 seconds.
4. Check for DTC U010E-00 being current on the CONSULT screen.
Is DTC U010E-00 detected as current?

YES

GO TO 4 .

NO

Replace ECM. Refer to Removal and Installation .
CHECK DTCS AND VERIFY CONDITION
1. Turn ignition switch OFF.
2. Connect DEF control module harness connector C35.
3. Turn ignition switch ON and wait 30 seconds.
4. Connect CONSULT and check for current "ENGINE" diagnostic trouble codes.
Did DTC U040F-00 become current?

YES

GO TO 5 .

NO

The removal and installation of the connector corrected the issue.
INSPECT ECM AND HARNESS CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector E93.
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 FOR PAST DTC
1. Connect all components.
2. Turn ignition switch ON and wait 30 seconds.
3. Connect CONSULT and check for "ENGINE" diagnostic trouble codes.
4. Check for DTC U040F-00 being past on the CONSULT screen.
Is DTC U040F-00 detected as past?

YES

The removal and installation of the connector corrected the issue.

NO

Replace the DEF control module. Refer to Removal and Installation .