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:
  - P0104-00
  - P0472-00
  - P0473-00
  - P2280-00
  - Any turbocharger DTCs
  - Any EGR or EGR bypass DTCs
Is applicable DTC detected?

YES

Refer to DTC Index .

NO

GO TO 2 .
CHECK THE EXHAUST GAS PRESSURE SENSOR TUBE
1. Turn ignition switch OFF.
2. Remove the exhaust gas pressure sensor tube.
  - Inspect the inside of the tube. If clogged, use compressed air to remove debris or soot buildup.
  - Check the tube for cracks and thread damage.
Is the inspection result normal?

YES

GO TO 3 .

NO

Clean or replace the exhaust gas sensor pressure tube.
INSPECT EXHAUST GAS PRESSURE SENSOR AND CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect exhaust gas pressure sensor harness connector F199.
3. Inspect the harness connector and exhaust gas pressure sensor 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 and wait 30 seconds.
2. With the exhaust gas temperature sensor harness connector F199 disconnected. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Did P0472-00 DTC become current?

YES

GO TO 5.

NO

GO TO 6 .
CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch OFF.
2. Connect a jumper wire between exhaust gas pressure sensor harness connector F199 terminals 1 and 3.
3. Turn ignition switch ON and wait 30 seconds.
4. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Did P0473 DTC become current?

YES

GO TO 7 .

NO

GO TO 6 .
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 FOR AN OPEN CIRCUIT IN THE ENGINE HARNESS

Turn ignition switch OFF.

Check continuity between ECM harness connector F101 and exhaust gas pressure sensor harness connector F199.

ECM		ECM		Resistance
Connector	Terminal	Connector	Terminal
F101	106	F199	1	< 10 Ω
	127		2
	132		3

Is the inspection result normal?

YES

GO TO 8 .

Repair or replace harness for an open circuit.

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

Measure the resistance between the ECM harness connector F101 terminal 132 and all other F101 terminals.

ECM		ECM		Resistance
Connector	Terminal	Connector	Terminal	Resistance
F101	132	F101	All	> 100k Ω

Is the inspection result normal?

YES

GO TO 9 .

Repair or replace harness for a short circuit.

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

Measure the resistance between ECM harness connector F101 terminal 132 and ground.

ECM		Ground	Resistance
Connector	Terminal
F101	132	-	> 100k Ω

Is the inspection result normal?

YES

GO TO 10 .

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

INSPECT THE ROTARY TURBINE CONTROL VALVE ACTUATOR
1. Disconnect the rotary turbine control valve actuator harness connector F146.
2. Inspect the rotary turbine control valve actuator and harness 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 11 .

NO

Repair or replace error-detected parts.
INSPECT THE TURBOCHARGER TURBINE ACTUATOR LINKAGE
Inspect the turbocharger turbine actuator linkage for damage.

Is the inspection result normal?

YES

GO TO 12 .

NO

Replace the turbocharger turbine actuator linkage. Refer to Exploded View .
INSPECT THE TURBOCHARGER TURBINE ACTUATOR LINKAGE MOVEMENT
Rotate (by hand) the turbocharger turbine actuator linkage from stop to stop.
- Check for smooth movement between the stops.
- There will be an initial friction force that must be overcome before the linkage will move. Once movement is started, the actuator linkage must move to the other stop position by hand.
Is the inspection result normal?

YES

Replace the exhaust gas pressure sensor. Refer to Removal and Installation .

NO

Inspect the base engine components for damage. Replace the turbocharger assembly.