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 sensor supply DTCs being current on the CONSULT screen.
Is applicable DTC detected?

YES

Refer to DTC Index .

NO

GO TO 2 .
CHECK DTC PRIORITY
1. Turn ignition switch ON.
2. Connect CONSULT and check for ENGINE diagnostic trouble codes.
3. Check for DTC P0473-00 being past on the CONSULT screen.
Is DTC P0473-00 detected as past?

YES

Refer to Intermittent Incident .

NO

GO TO 3 .
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 engine harness and exhaust gas pressure 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 CIRCUIT RESPONSE
1. Turn ignition switch OFF.
2. Disconnect exhaust gas pressure sensor harness connector F199.
3. Turn ignition switch ON and wait 30 seconds.
4. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Did DTC P0472-00 become current and DTC P0473-00 become past?

YES

GO TO 5 .

NO

GO TO 7 .

CHECK THE SENSOR SUPPLY VOLTAGE AND RETURN CIRCUIT

Turn ignition switch OFF.
Disconnect the exhaust gas pressure sensor from the engine harness connector F199.
Turn ignition switch ON.

Measure the voltage between exhaust gas pressure sensor harness connector F199 terminals 2 and 3.

Exhaust gas pressure sensor

Voltage

(Approx.)

Connector

Terminal

Connector

Terminal

F199

4.75-5.25

Is the inspection result normal?

YES

GO TO 6.

GO TO 10.

CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch OFF.
2. Connect the exhaust gas pressure sensor harness connector F199.
3. Turn ignition switch ON and wait 30 seconds.
4. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Did DTC P0473-00 become current?

YES

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

NO

The removal and installation of the connector corrected the issue.
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 8 .

NO

Repair or replace error-detected parts.
CHECK THE ECM RESPONSE
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector F101.
3. Turn ignition switch ON. Wait 30 seconds.
4. With CONSULT check for current ENGINE diagnostic trouble codes.
Did P0472-00 DTC become current and P0473-00 DTC become past?

YES

GO TO 9 .

NO

Replace the ECM. Refer to Removal and Installation .
CHECK DTC PRIORITY
1. Connect all components.
2. Turn ignition switch ON.
3. Connect CONSULT and check for ENGINE diagnostic trouble codes.
4. Check for DTC P0473-00 being past on the CONSULT screen.
Is the inspection result normal?

YES

The removal and installation of the connector corrected the issue.

NO

Repair or replace harness for an open or shorted SUPPLY circuit.
INSPECT ECM AND ENGINE 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 11 .

NO

Repair or replace error-detected parts.

CHECK THE SENSOR SUPPLY VOLTAGE AND RETURN CIRCUIT

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

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

ECM

Voltage

(Approx.)

Connector

Terminal

F101

127

106

4.75-5.25

Is the inspection result normal?

YES

GO TO 12.

Replace the ECM. Refer to Removal and Installation .

CHECK DTC PRIORITY
1. Connect all components.
2. Turn ignition switch ON.
3. Connect CONSULT and check for ENGINE diagnostic trouble codes.
4. Check for DTC P0473-00 being past on the CONSULT screen.
Is DTC P0473-00 detected as past?

YES

The removal and installation of the connector corrected the issue.

NO

Repair or replace harness for an open or pin-to-pin short.