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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 510 (Manual Air Conditioner (DTC/Circuit Diagnosis)) >> DTC/Circuit Diagnosis >> Heater Pump >> DTC Diagnosis Procedure >> Diagnostic Procedure For Heater Pump Circuit

Diagnostic Procedure For Heater Pump Circuit

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK POWER SUPPLY TO HEATER PUMP 
    1. Disconnect heater pump connector.
    2. Turn ignition switch ON.
    3. Set front blower motor to maximum speed.
    4. Turn temperature control dial to full hot.
    5. Check voltage between heater pump harness connector E26 terminal 1 and ground.

    1 - Ground

    : Battery voltage

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    GO TO 3.

  2. CHECK HEATER PUMP GROUND 
    1. Turn ignition switch OFF.
    2. Check continuity between heater pump harness connector E26 terminal 2 and ground.

    2 - Ground

    : Continuity should exist.

    Is the inspection result normal?

    YES

    Replace heater pump. Refer to Removal and Installation .

    NO

    Repair harness or connector.

  3. CHECK HEATER PUMP RELAY 
    1. Turn ignition switch OFF.
    2. Check heater pump relay. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Replace heater pump relay.

  4. CHECK RELAY POWER SUPPLY 
    1. Turn ignition switch ON.
    2. Check voltage between heater pump relay harness connector E27 terminals 2, 5 and ground.

    2 - Ground

    : Battery voltage

    5 - Ground

    : Battery voltage

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair harness or connector.

  5. CHECK HEATER PUMP MOTOR POWER CIRCUIT 
    1. Turn ignition switch OFF.
    2. Check continuity between heater pump relay harness connector E27 terminal 3 and heater pump harness connector E26 terminal 1.

      3 - 1

      : Continuity should exist.
    3. Check continuity between heater pump relay harness connector E27 terminal 3 and ground.

      3 - Ground

      : Continuity should not exist.

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Repair harness or connector.

  6. CHECK CIRCUIT BETWEEN HEATER PUMP RELAY AND FRONT AIR CONTROL 
    1. Disconnect front air control connector.
    2. Check continuity between front air control harness connector M49 terminal 8 and heater pump relay harness connector E27 terminal 1.

      1 - 8

      : Continuity should exist.
    3. Check continuity between heater pump relay harness connector E27 terminal 1 and ground.

      1 - Ground

      : Continuity should not exist.

    Is the inspection result normal?

    YES

    Replace front air control. Refer to Removal and Installation - Front Air Control .

    NO

    Repair harness or connector.

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