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 FOR CURRENT RELATED DIAGNOSTIC TROUBLE CODES
1. Turn ignition switch ON.
2. Connect CONSULT and check for the following "current" ENGINE diagnostic trouble codes:
  - P0117-00
  - P0118-00
Are any of the above DTCs detected?

YES

Perform diagnosis of applicable DTC first. Refer to DTC Index .

NO

GO TO 2 .
CHECK THE THERMOSTAT
Check the thermostat for correct operation.

Does the thermostat operate correctly?

YES

GO TO 3 .

NO

Replace the thermostat. Refer to Removal and Installation .
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 4 .

NO

Repair or replace error-detected parts.
CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch ON.
2. Wait for 30 seconds.
3. Using CONSULT, check for current ENGINE diagnostic trouble codes.
Is P0118-00 DTC current?

YES

GO TO 5 .

NO

GO TO 6 .
CHECK THE ECM RESPONSE
1. Connect a jumper wire between the coolant temperature sensor two connector terminals 1 and 2.
2. Wait for 30 seconds.
3. With CONSULT check for current ENGINE diagnostic trouble codes.
Is P0117-00 DTC current?

YES

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

NO

GO TO 6 .
INSPECT ECM AND ENGINE HARNESS CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect the ECM engine harness connector F101.
3. 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 CIRCUIT RESPONSE
1. Turn ignition switch ON.
2. Wait for 30 seconds.
3. Using CONSULT, check for current ENGINE diagnostic trouble codes.
NOTE: Other DTCs will be set during this step.

Is P0118-00 DTC current?

YES

GO TO 8 .

NO

Replace the ECM. Refer to Removal and Installation .
CHECK THE ECM RESPONSE
CAUTION:
When probing or jumping between connector pins or terminals:
- Always use extreme care or connector damage could result. Do not bend or damage connector pins and terminals. Damaged connectors, pins or terminals could result in additional issues or difficult-to-diagnose intermittent incidents.
- Do not probe or short unintended circuits or component and/or control module damage could result.
1. Connect a jumper wire between ECM connector F101 pins 170 and 193.
2. Wait for 30 seconds.
3. With CONSULT check for current ENGINE diagnostic trouble codes.
Is P0117-00 DTC current?

YES
- High resistance or short circuit has been detected in the engine harness. Repair or replace the engine harness.
- GO TO 9 .
NO
- Replace the ECM. Refer to Removal and Installation .
- GO TO 9 .
CHECK FOR CURRENT DTC
1. Turn ignition switch OFF.
2. Disconnect the jumper wire.
3. Connect all harness connectors.
4. Turn ignition switch ON.
5. Using CONSULT, erase ENGINE diagnostic trouble codes.
6. Operate the engine within the "Conditions for clearing the DTC".
7. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Is P0116-00 DTC current?

YES

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

NO

The removal and installation of the connector corrected the issue.