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Home >> Infiniti >> 2016 >> Q50 Base, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 123 (Hybrid Motor System (Diagnostic Trouble Codes (DTCS) P2122-P31FF And Circuit Diagnosis) (Hybrid)) >> DTC / Circuit Diagnosis >> DTC P3123, P3124: HV System Cooling Pump >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different variant/trim than selected.

  1. CHECK ELECTRIC WATER PUMP OPERATION

    G-20 With CONSULT

    1. Turn ignition switch ON.
    2. Select "ACTIVE TEST" mode of "EV/HEV" using CONSULT.
    3. Perform "WATER PUMP".
    4. With operating the test item, touch in the main body of pump and check the operation vibration of the electric water pump.
      ON : Electric water pump operate
      OFF : Electric water pump stop

    G-21 Without CONSULT

    1. Set the vehicle to READY.
    2. Touch in the main body of pump and check the operation vibration of the electric water pump.

    Is the inspection result normal?

    YES 

    Perform INTERMITTENT INCIDENT .

    NO 

    GO TO STEP 2  .

  2. CHECK ELECTRIC WATER PUMP POWER SUPPLY-1

    1. Turn ignition switch OFF.
    2. Disconnect electric water pump harness connector.
    3. Check the voltage between electric water pump harness connector.
      Electric water pump Voltage
      Connector + -
      Terminal
      E23 1 2 Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    GO TO STEP 3  .

  3. CHECK ELECTRIC WATER PUMP POWER SUPPLY-2

    Check the voltage between electric water pump harness connector and ground.

    + - Voltage
    Electric water pump
    Connector Terminal
    E23 1 Ground Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Perform the trouble diagnosis for power supply circuit.

  4. CHECK ELECTRIC WATER PUMP GROUND CIRCUIT

    Check the continuity between electric water pump harness connector and ground.

    + - Continuity
    Electric water pump
    Connector Terminal
    E23 2 Ground Existed

    Is the inspection result normal?

    YES 

    Perform INTERMITTENT INCIDENT .

    NO 

    Repair or replace error-detected parts.

  5. CHECK ELECTRIC WATER PUMP SIGNAL CIRCUIT

    1. Disconnect HPCM harness connector.
    2. Check the continuity between HPCM harness connector and electric water pump harness connector.
      + - Continuity
      HPCM Electric water pump
      Connector Terminal Connector Terminal
      B15 48 E23 4 Existed
      61 3
    3. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    Replace electric water pump. Refer to REMOVAL AND INSTALLATION .

    NO 

    Repair or replace error-detected parts.

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