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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 211 (Engine Control System (DTC/Circuit Diagnosis) (CUMMINS 5.0L) (1 Of 6)) >> DTC/Circuit Diagnosis >> DTC P0106-00: Manifold Absolute Pressure Sensor >> Diagnosis Procedure

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.
  1. CHECK DTC PRIORITY 
    1. Turn ignition switch ON.
    2. Connect CONSULT and check for ENGINE diagnostic trouble codes.
    3. Check for DTCs P0102-00, P0103-00, P0104-00, P0107-00, P0108-00, P0237-00, P0238-00, P1191-00, P1192-00, P1193-00, P2280-00 or P2579-00 being current or past (high counts) on the CONSULT screen.

    Is applicable DTC detected?

    YES

    Refer to DTC Index .

    NO

    GO TO 2 .

  2. CHECK DTC PRIORITY 

    Check for any turbocharger, compressor bypass valve, EGR valve or EGR bypass valve DTCs being current on the CONSULT screen.

    Is applicable DTC detected?

    YES

    Refer to DTC Index .

    NO

    GO TO 3 .

  3. CHECK DATA MONITOR 
    1. Check turbocharger compressor intake pressure Data Monitor item on the CONSULT screen.
    2. Compare turbocharger compressor intake pressure to the local barometric pressure.

    Is the reading within ± 2 kPa (0.3 psi) of local barometric pressure?

    YES

    GO TO 4 .

    NO

    Replace the turbocharger compressor intake pressure sensor. Refer to Removal and Installation .

  4. CHECK DATA MONITOR 

    Check charge air cooler outlet pressure Data Monitor item on the CONSULT screen.

    Is the reading within ± 10.3 kPa (1.5 psi) of local barometric pressure?

    YES

    GO TO 5 .

    NO

    GO TO 7 .

  5. CHECK CHARGE AIR COOLER 
    1. Start the engine.
    2. Check the charge air cooler and connections for air leaks.
      • Check for air leaks in connections and hoses between the turbocharger outlet and the charge air cooler inlet.

    Are any air leaks present?

    YES

    Repair or replace the leaking component.

    NO

    GO TO 6 .

  6. CHECK DATA MONITOR 
    1. Turn ignition switch OFF.
    2. Turn ignition switch ON.
    3. Check intake and exhaust restriction Data Monitor items on the CONSULT screen.

    Is the exhaust or intake restriction within specifications?

    YES

    GO TO 14 .

    NO

    Repair or replace the restricted component.

  7. INSPECT ENGINE CHARGE AIR COOLER OUTLET PRESSURE/TEMPERATURE SENSOR AND CONNECTOR PINS 
    1. Turn ignition switch OFF.
    2. Disconnect engine charge air cooler outlet pressure/temperature sensor connector F140.
    3. Inspect the harness and 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 8 .

    NO

    Repair or replace error-detected parts.

  8. CHECK DTC PRIORITY 
    1. Engine charge air cooler outlet pressure/temperature sensor connector F140 remains disconnected.
    2. Turn ignition switch ON.
    3. Check for DTC P0107-00 being current on the CONSULT screen after 30 seconds.

    Is applicable DTC detected?

    YES

    GO TO 9 .

    NO

    GO TO 11 .

  9. CHECK DTC PRIORITY 
    1. Turn ignition switch OFF.
    2. Connect a jumper wire between terminals 1 and 2 of the engine charge air cooler outlet pressure/temperature sensor connector F140.
    3. Turn ignition switch ON.
    4. Check for DTC P0108-00 being current on the CONSULT screen after 30 seconds.

    Is applicable DTC detected?

    YES

    GO TO 10 .

    NO

    GO TO 11 .

  10. CHECK ENGINE CHARGE AIR COOLER OUTLET PRESSURE/TEMPERATURE SENSOR 
    1. Turn ignition switch OFF.
    2. Remove the engine charge air cooler outlet pressure/temperature sensor. Refer to Removal and Installation .
    3. Inspect the tip of the sensor for soot or carbon buildup.

    Does the tip of the sensor display soot or carbon buildup?

    YES

    Use compressed air to remove the soot or carbon buildup.

    NO

    GO TO 14 .

  11. INSPECT ECM AND CONNECTOR PINS 
    1. Turn ignition switch OFF.
    2. Disconnect ECM connector F101.
    3. Inspect the harness and module 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 12 .

    NO

    Repair or replace error-detected parts.

  12. CHECK DTC PRIORITY 
    1. ECM connector F101 remains disconnected.
    2. Turn ignition switch ON.
    3. Check for DTC P0107-00 being current on the CONSULT screen after 30 seconds.

    Is applicable DTC detected?

    YES

    GO TO 13 .

    NO

    Replace the ECM. Refer to Removal and Installation .

  13. CHECK DTC PRIORITY 
    1. Turn ignition switch OFF.
    2. Connect a jumper wire between terminals 106 and 194 of the ECM connector F101.
    3. Turn ignition switch ON.
    4. Check for DTC P0108-00 being current on the CONSULT screen after 30 seconds.

    Is applicable DTC detected?

    YES

    High resistance or a short circuit is detected in the engine harness. Repair or replace the harness.

    NO

    Replace the ECM. Refer to Removal and Installation .

  14. VERIFY THE VACUUM PUMP OUTPUT 
    1. Turn ignition switch OFF.
    2. Install any previously removed components and connect any previously disconnected connectors.
    3. Turn ignition switch ON.
    4. Start the engine.
    5. Connect a hand pump or vacuum gauge to the vacuum pump inlet.

    Is the vacuum within specifications?

    YES

    GO TO 15 .

    NO

    Replace the vacuum pump. Refer to Removal and Installation .

  15. CHECK COMPRESSOR BYPASS VALVE ACTUATOR 
    1. Turn ignition switch OFF.
    2. Using a hand pump, apply vacuum to the compressor bypass valve vacuum inlet. Verify that the valve moves from stop to stop.

    Does the compressor bypass valve move from stop to stop?

    YES

    GO TO 16 .

    NO

    Remove any obstructions preventing the valve from moving, or replace the compressor bypass valve. Refer to Exploded View .

  16. CHECK DATA MONITOR 
    1. Turn ignition switch ON.
    2. Monitor and record engine speed, charge air cooler outlet pressure and compressor bypass valve Data Monitor items on the CONSULT screen.
    3. Start the engine.
    4. Override the compressor bypass valve to OPEN.
    5. Using the accelerator pedal, raise the engine speed to 2000 RPM and hold for 20 seconds.
    6. Return the engine speed to idle.
    7. Override the compressor bypass valve to CLOSED.
    8. Using the accelerator pedal, raise the engine speed to 2000 RPM and hold for 20 seconds.
    9. Return the engine speed to idle.

    Did the charge air cooler outlet pressure increase by 50 kPa (7 psi) or more?

    YES

    GO TO 17 .

    NO

    Replace the engine charge air cooler outlet pressure/temperature sensor. Refer to Removal and Installation .

  17. CHECK DATA MONITOR 
    1. Monitor and record engine speed, turbocharger speed and compressor bypass valve Data Monitor items on the CONSULT screen.
    2. Start the engine.
    3. Override the compressor bypass valve to OPEN.
    4. Using the accelerator pedal, raise the engine speed to 2000 RPM and hold for 20 seconds.
    5. Return the engine speed to idle.
    6. Override the compressor bypass valve to CLOSED.
    7. Using the accelerator pedal, raise the engine speed to 2000 RPM and hold for 20 seconds.
    8. Return the engine speed to idle.

    Was the turbocharger speed less than 130, 000 RPM with the valve OPEN and between 140, 000 and 160, 000 RPM with the valve CLOSED?

    YES

    GO TO 18 .

    NO

    Replace the turbocharger speed sensor. Refer to Removal and Installation .

  18. CHECK DATA MONITOR 
    1. Monitor and record engine speed, low pressure turbocharger boost pressure, charge air cooler outlet pressure and compressor bypass valve Data Monitor items on the CONSULT screen.
    2. Start the engine.
    3. Override the compressor bypass valve to OPEN.
    4. Using the accelerator pedal, raise the engine speed to 2000 RPM and hold for 20 seconds.
    5. Return the engine speed to idle.
    6. Override the compressor bypass valve to CLOSED.
    7. Using the accelerator pedal, raise the engine speed to 2000 RPM and hold for 20 seconds.
    8. Return the engine speed to idle.

    Did the low pressure turbocharger boost pressure increase by 5 kPa (1 psi) or greater from the valve OPEN to the valve CLOSED at 2000 RPM?

    YES

    Refer to Intermittent Incident .

    NO

    Replace the low pressure turbocharger boost pressure sensor. Refer to Removal and Installation .

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