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 P0691-00 being current on the CONSULT screen.
Is DTC P0691-00 detected as current?

YES

GO TO 2 .

NO

Refer to Intermittent Incident .
INSPECT FAN CLUTCH ASSEMBLY AND CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect fan clutch assembly harness connector F106.
3. Inspect the harness connector and fan clutch assembly 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 FAN CLUTCH VOLTAGE

Turn ignition switch OFF.
Disconnect the fan clutch assembly harness connector F106.
Turn ignition switch ON.

Measure the voltage between fan clutch assembly harness connector F106 terminal 1 and ground.

Fan clutch assembly

(-)

Voltage (V)

(Approx.)

Connector

Terminal

F106

Ground

Battery voltage

Is the inspection result normal?

YES

GO TO 4 .

Repair or replace the engine harness for an open circuit.

CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch OFF.
2. Disconnect fan clutch assembly harness connector F106.
3. Turn ignition switch ON and wait 30 seconds.
4. Connect CONSULT and check for current "ENGINE" diagnostic trouble codes.
Is DTC P0692-00 current?

YES

Replace fan clutch assembly. Refer to Exploded View .

NO

GO TO 5 .
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 6 .

NO

Repair or replace error-detected parts.

CHECK FOR A PIN-TO-GROUND SHORT CIRCUIT IN THE ENGINE HARNESS

Turn ignition switch OFF.
Disconnect the ECM harness connector F101.
Disconnect the fan clutch assembly harness connector F106.

Measure the resistance between the ECM harness connector F101 terminal 181 and ground.

ECM		Ground	Resistance
Connector	Terminal
F101	181	-	> 100k Ω

Is resistance greater than 100k ohms?

YES

GO TO 7 .

Repair or replace the engine harness for a short to ground.

CHECK FOR A PIN-TO-PIN SHORT CIRCUIT IN THE ENGINE HARNESS

Turn ignition switch OFF.
Disconnect the ECM harness connector F101.
Disconnect the fan clutch assembly harness connector F106.

Measure the resistance between the ECM harness connector terminal 80 and all other terminals in the ECM harness connector F101.

ECM		ECM		Resistance
Connector	Terminal	Connector	Terminal	Resistance
F101	181	F101	All	> 100k Ω

Is resistance greater than 100k ohms?

YES

GO TO 8 .

Repair or replace the engine harness for a short.

CHECK FOR PAST DTC
1. Connect all components.
2. Turn ignition switch ON and wait 30 seconds.
3. Connect CONSULT and check for current "ENGINE" diagnostic trouble codes.
Is DTC P0691 past?

YES

The removal and installation of the connector corrected the fault.

NO

Replace ECM. Refer to Removal and Installation .