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. Are any of the following displayed as current on the CONSULT screen:
  - P0103-00
  - P0107-00
  - P0108-00
  - P012C-00
  - P012D-00
  - P0652-00
  - P1192-00
  - P1193-00
  - P22CD-00
  - P22CE-00
Is applicable DTC detected?

YES

Refer to DTC Index .

NO

GO TO 2 .
CHECK FOR INTERMITTENT DTC
1. Turn ignition switch ON.
2. Connect CONSULT and clear past "ENGINE" diagnostic trouble codes.
3. Start the engine.
4. Using accelerator pedal, increase engine speed to 1500 RPM for at least 20 seconds.
5. Allow engine to idle.
6. Connect CONSULT and check for "ENGINE" diagnostic trouble codes.
7. Check for DTC P0049-00 being current on the CONSULT screen.
Is applicable DTC detected?

YES

GO TO 3 .

NO

Refer to Intermittent Incident .
INSPECT TURBOCHARGER SPEED SENSOR AND CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect turbocharger speed sensor harness connector F126.
3. Inspect the engine harness and turbocharger speed 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 SENSOR SUPPLY VOLTAGE AND RETURN CIRCUIT

Turn ignition switch OFF.
Disconnect the turbocharger speed sensor harness connector F126.
Turn ignition switch ON.

Measure the voltage between turbocharger speed sensor harness connector F126 terminals 1 and 2.

Turbocharger speed sensor

Voltage

(Approx.)

Connector

Terminal

F126

4.75V - 5.25V

Is the inspection result normal?

YES

GO TO 5.

GO TO 6.

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

Turn ignition switch OFF.
Disconnect the ECM harness connector F101.
Disconnect the turbocharger speed sensor harness connector F126.

Measure the resistance between the ECM harness connector F101 terminal 188 and all other terminals in the ECM harness connector F101.

ECM		ECM		Resistance
Connector	Terminal	Connector	Terminal	Resistance
F101	188	F101	All	> 100k Ω

Is the inspection result normal?

YES

Replace turbocharger speed sensor. Refer to Removal and Installation .

Repair or replace the harness for a short.

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 7 .

NO

Repair or replace error-detected parts.

CHECK THE SENSOR SUPPLY VOLTAGE AND RETURN CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector F101.
Turn ignition switch ON.

Measure the voltage between ECM harness connector F101 terminals 106 and 127.

ECM

Voltage

(Approx.)

Connector

Terminal

F101

106

127

4.75V -5.25V

Is the inspection result normal?

YES

Repair or replace the harness for an open.

Replace the ECM. Refer to Removal and Installation .