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 P1626-00 being current on the CONSULT screen.
Is applicable DTC detected?

YES

GO TO 2 .

NO

Refer to Intermittent Incident .
CHECK DTC PRIORITY
Check for DTC P0562-00 or P0563-00 being current on the CONSULT screen.

Is applicable DTC detected?

YES

Refer to DTC Index .

NO

GO TO 3 .
INSPECT SCR TEMPERATURE SENSOR MODULE AND CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect SCR temperature sensor module connector C30.
3. Inspect the harness and 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 4 .

NO

Repair or replace error-detected parts.

CHECK BATTERY SUPPLY VOLTAGE

Turn ignition switch OFF.
Disconnect SCR temperature sensor module connector C30.
Turn ignition switch ON.

Check voltage between the terminals of the SCR temperature sensor module connector C30.

SCR temperature sensor module connector C30		Condition	Voltage (V) (Approx.)
Terminal	Terminal
3	4	Ignition switch ON	< 6 V
		Engine cranking
		Engine at idle

Is the inspection result normal?

YES

GO TO 6 .

GO TO 5 .

CHECK CONDITION OF SCR TEMPERATURE SENSOR MODULE
1. Turn ignition switch OFF.
2. Connect SCR temperature sensor module connector C30.
3. Connect CONSULT and check for "ENGINE" diagnostic trouble codes.
4. Start and idle the engine.
5. Check for DTC P1626-00 being current on the CONSULT screen.
Is applicable DTC detected?

YES

Replace SCR temperature sensor module. Refer to Removal and Installation .

NO

Refer to Intermittent Incident .
CHECK BATTERY TERMINALS
Check the battery terminal connections.

Are the battery terminal connections tight and corrosion free?

YES

GO TO 7 .

NO

Tighten and clean the terminals.

CHECK BATTERY SUPPLY VOLTAGE CIRCUIT

Turn ignition switch OFF.
Disconnect SCR temperature sensor module connector C30.
Turn ignition switch ON.

Check voltage between SCR temperature sensor module connector C30 and ground.

SCR temperature sensor module

Ground

Voltage (V)

(Approx.)

Connector

Terminal

C30

< 6 V

Is the inspection result normal?

YES

Repair the open or high resistance condition in the battery supply voltage circuit.

Repair the open or high resistance condition in the ground circuit.