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 other existing ENGINE diagnostic trouble codes.
3. Check for DTC P0117-00 being current on the CONSULT screen.
Is applicable DTC current?

YES

GO TO 2 .

NO

Refer to Intermittent Incident .
INSPECT COOLANT TEMPERATURE SENSOR AND CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect the coolant temperature sensor from engine harness connector.
3. Inspect the coolant 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 ON.
2. With the sensor disconnected, connect CONSULT and wait 30 seconds.
3. Check for current ENGINE diagnostic trouble codes.
Is P0118-00 DTC current and P0117-00 DTC past?

YES

GO TO 4 .

NO

GO TO 5 .
CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch OFF.
2. Reconnect the coolant temperature sensor.
3. Turn ignition switch ON. Wait 30 seconds.
4. Recheck for current ENGINE diagnostic trouble codes.
Is P0117-00 DTC current and P0118-00 DTC past?

YES

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

NO

The removal and installation of the connector corrected the issue.
INSPECT ECM AND ENGINE HARNESS CONNECTOR PINS
1. Turn ignition switch OFF.
2. Inspect the ECM connector F101 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 7 .

NO

Repair or replace error-detected parts.
CHECK THE ECM RESPONSE
1. Turn ignition switch OFF.
2. Disconnect ECM engine harness side connector F101.
3. Turn ignition switch ON and wait 30 seconds.
4. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Is P0118-00 DTC current and P0117 DTC past?

YES

GO TO 6 .

NO

Replace the ECM. Refer to Removal and Installation .

CHECK COOLANT TEMPERATURE SENSOR SIGNAL FOR SHORT TO OTHER CIRCUITS

Check the continuity between the coolant temperature sensor signal and all other circuits at ECM harness connector.

ECM			Continuity
Connector	Terminal	Terminal	Continuity
F101	193	All others	No

Is the inspection result normal?

YES

GO TO 8 .

Repair short circuit in harness connector.

CHECK COOLANT TEMPERATURE SENSOR SIGNAL FOR SHORT TO GROUND

Check the continuity between ECM harness connector and ground.

ECM		Ground	Continuity
Connector	Terminal
F101	195 (+)	Ground (-)	No

Is the inspection result normal?

YES

GO TO 9 .

Repair short circuit in harness or connectors.

CHECK FOR INACTIVE DTC
1. Connect all components in the correct positions.
2. Turn ignition switch ON.
3. Connect CONSULT and check for ENGINE diagnostic trouble codes.
Is P0117-00 DTC past?

YES

The removal and installation of the connector corrected the issue.

NO

Troubleshooting procedure need to be repeated. Go to DTC Description .