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 DTC
1. Turn ignition switch ON.
2. Connect CONSULT and check for existing "ENGINE" diagnostic trouble codes.
Is P245C-00 DTC current?

YES

GO TO 2 .

NO

Refer to Intermittent Incident .
INSPECT EGR BYPASS VALVE ACTUATOR AND ELECTRICAL CONNECTIONS
1. Turn ignition switch OFF.
2. Disconnect the EGR bypass valve actuator connector.
3. Inspect connector 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.
- GO TO 8 .

CHECK EGR BYPASS MOTOR RETURN CIRCUIT FOR SHORT TO GROUND

Disconnect the ECM.
Check for continuity between EGR bypass valve connector F145 motor return circuit signal terminal 5 and ground.

EGR bypass valve		Ground	Continuity
Connector	Terminal
F145	5	-	No

Is the inspection result normal?

YES

GO TO 4 .

Repair or replace harness for a short to ground.
GO TO 8.

CHECK THE EGR BYPASS MOTOR RETURN CIRCUIT FOR OPEN OR HIGH RESISTANCE

Check the return circuit for continuity between the ECM connector and the EGR bypass valve connector.

ECM		EGR bypass valve		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F101	159	F145	5	Yes

Is the inspection result normal?

YES

GO TO 5 .

Repair open circuit in harness or connectors.
GO TO 8 .

CHECK EGR BYPASS MOTOR POWER CIRCUIT FOR SHORT TO GROUND

Check for continuity between EGR bypass valve connector F145 motor power circuit terminal 1 and ground.

EGR bypass valve		Ground	Continuity
Connector	Terminal
F145	1	-	No

Is the inspection result normal?

YES

GO TO 6 .

Repair or replace harness for a short to ground.
GO TO 8.

CHECK THE EGR BYPASS MOTOR POWER CIRCUIT FOR OPEN OR HIGH RESISTANCE

Check the power circuit for continuity between the ECM connector and the EGR bypass valve connector.

ECM		EGR bypass valve		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F101	180	F145	1	Yes

Is the inspection result normal?

YES

Replace EGR bypass valve. Refer to Removal and Installation .
GO TO 7 .

Repair open circuit in harness or connectors.
GO TO 8 .

CHECK FOR CURRENT DTC
1. Connect all harness connectors.
2. Turn ignition switch ON.
3. Using CONSULT, check for current "ENGINE" diagnostic trouble codes.
Is P245C-00 DTC current?

YES
- Replace the ECM. Refer to Removal and Installation .
- GO TO 8 .
NO
- The removal and installation of the connector corrected the issue.
- GO TO 8 .
ERASE CURRENT DTCS
1. Turn ignition switch OFF.
2. Connect all harness connectors.
3. Turn ignition switch ON.
4. Using CONSULT, erase ENGINE diagnostic trouble codes.
5. Operate the engine within the "Conditions for Clearing DTC".
6. Using CONSULT, check for current "ENGINE" diagnostic trouble codes.
Is P245C-00 DTC current?

YES

Return to Diagnosis Procedure. Refer to DTC Description .

NO

Repair complete.