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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 616 (Engine Control System (DTC/Circuit Diagnosis) (17 Of 17)) >> Circuit Diagnosis >> Refrigerant Pressure Sensor >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTION 
    1. Turn A/C switch and blower fan switch OFF.
    2. Turn ignition switch OFF.
    3. Check ground connection E9. Refer to Ground Inspection in Intermittent Incident .

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Repair or replace ground connection.

  2. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY 
    1. Disconnect refrigerant pressure sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between refrigerant pressure sensor harness connector and ground.

      +

      -

      Voltage

      (Approx.)

      Refrigerant pressure sensor

      Connector

      Terminal

      E244

      1

      Ground

      5 V

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    GO TO 3.

  3. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.

      Refrigerant pressure sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E244

      1

      F78

      80

      Existed
    4. Also check harness for short to power and short to ground.

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair or replace error-detected parts.

  4. CHECK SENSOR POWER SUPPLY 2 CIRCUIT 

    Refer to Diagnosis Procedure .

    Is the inspection result normal?

    YES

    Perform the trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure .

    NO

    Repair or replace error-detected parts.

  5. CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.

      Refrigerant pressure sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E244

      3

      F79

      97

      Existed
    4. Also check harness for short to power and short to ground.

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Repair or replace error-detected parts.

  6. CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.

      Refrigerant pressure sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E244

      2

      F78

      70

      Existed
    2. Also check harness for short to power and short to ground.

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    Repair or replace error-detected parts.

  7. CHECK INTERMITTENT INCIDENT 

    Refer to Intermittent Incident .

    Is the inspection result normal?

    YES

    Replace refrigerant pressure sensor. Refer to Removal and Installation .

    NO

    Repair or replace error-detected parts.

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