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. Start the engine and let it idle for 1 minute.
2. Turn engine OFF.
3. Turn ignition switch ON.
4. Connect CONSULT and check for existing ENGINE diagnostic trouble codes:
  - P0652-00
  - P0653-00
  - P245C-00
  - P245D-00
  - P2494-00
  - P2495-00
Are any of the above current DTCs present?

YES

Refer to DTC Index .

NO

GO TO 2 .
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 10 .

CHECK THE EGR BYPASS SENSOR SUPPLY AND RETURN CIRCUITS

Turn ignition switch ON.

Check the voltage between EGR bypass actuator position sensor supply and return circuits at the EGR bypass valve connector.

EGR bypass valve

Voltage (V)

(Approx.)

Connector

Terminal (+)

Terminal (-)

F145

Is the inspection result normal?

YES

GO TO 4 .

GO TO 6 .

CHECK THE CIRCUIT RESPONSE
1. Leave EGR bypass valve actuator connector disconnected.
2. Wait 30 seconds.
3. Using CONSULT, check for current "ENGINE" diagnostic trouble codes.
Is P2495-00 DTC current?

YES

GO TO 5 .

NO

GO TO 6 .
CHECK THE CIRCUIT RESPONSE
1. Connect a jumper wire between the EGR bypass actuator position sensor RETURN circuit terminal 3 and the SIGNAL circuit terminal 4 at the EGR bypass actuator connector.
2. Wait 30 seconds.
3. Using CONSULT, check for current "ENGINE" diagnostic trouble codes.
Is P2494 - 00 DTC current?

YES
- A malfunctioning EGR bypass valve actuator position sensor has been detected. Replace the EGR bypass valve actuator. Refer to Removal and Installation .
- GO TO 10 .
NO

GO TO 6 .
INSPECT ECM AND ELECTRICAL CONNECTIONS
1. Turn ignition switch OFF.
2. Disconnect the jumper wire.
3. Disconnect the ECM F101 connector.
4. 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 7 .

NO
- Repair or replace error-detected parts.
- GO TO 10 .
CHECK THE ECM RESPONSE
1. Turn ignition switch ON.
2. Wait 30 seconds.
3. Using CONSULT, check for current "ENGINE" diagnostic trouble codes.
Is P2495-00 DTC current?

YES

GO TO 8 .

NO
- Replace the ECM. Refer to Removal and Installation .
- GO TO 10 .
CHECK THE ECM RESPONSE
CAUTION:
When probing or jumping between connector pins or terminals:
- Always use extreme care or connector damage could result. Do not bend or damage connector pins and terminals. Damaged connectors, pins or terminals could result in additional issues or difficult-to-diagnose intermittent incidents.
- Do not probe or short unintended circuits or component and/or control module damage could result.
1. Connect a jumper wire between ECM connector F101 return circuit pin 127 and signal circuit pin 172.
2. Turn ignition switch ON.
3. Wait for 30 seconds.
4. Using CONSULT, check for current "ENGINE" diagnostic trouble codes.
Did DTC P2494-00 become current?

YES

GO TO 9 .

NO
- Replace the ECM. Refer to Removal and Installation .
- GO TO 10 .
CHECK FOR CURRENT DTC
1. Turn ignition switch OFF.
2. Disconnect the jumper wire.
3. Connect all harness connectors.
4. Start the engine and let it idle for 1 minute.
5. Using CONSULT, check for current "ENGINE" diagnostic trouble codes.
Did DTC P2493-00 become current?

YES
- High resistance has been detected in the engine harness. Repair or replace the engine harness.
- GO TO 10 .
NO
- The removal and installation of the connector corrected the issue.
- GO TO 10 .
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 P2493-00 DTC current?

YES

Return to Diagnosis Procedure. Refer to DTC Description .

NO

Repair complete.