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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 P3103: Dc/Dc Converter Cooling System >> Diagnosis Procedure

Diagnosis Procedure

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

ELECTRIC_SHOCK Since hybrid vehicles and electric vehicles contain a high voltage battery, there is the risk of electric shock, electric leakage, or similar accidents if the high voltage component and vehicle are handled incorrectly. Be sure to follow the correct work procedures when performing inspection and maintenance.

WARNING:
  • Be sure to remove the service plug in order to disconnect the high voltage circuits before performing inspection or maintenance of high voltage system harnesses and parts.
  • The removed service plug must always be carried in a pocket of the responsible worker or placed in the tool box during the procedure to prevent the plug from being connected by mistake.
  • Be sure to wear insulating protective equipment before beginning work on the high voltage system.
  • Never allow workers other than the responsible person to touch the vehicle containing high voltage parts. To keep others from touching the high voltage parts, these parts must be covered with an insulating sheet except when using them.
  • Refer to HIGH VOLTAGE PRECAUTIONS .
CAUTION:

Never bring the vehicle into the READY status with the service plug removed unless otherwise instructed in the Service Information. A malfunction may occur if this is not observed.

  1. CHECK INTAKE GRILLE OF REAR PARCEL SHELF FINISHER

    Check whether there is blocking in the intake grille of rear parcel shelf finisher. Refer to EXPLODED VIEW WITH TORQUE SPECIFICATIONS .

    Is there blocking in the intake grill?

    YES 

    Remove foreign matter.

    NO 

    GO TO STEP 2  .

  2. CHECK INTAKE DUCT

    Check whether there is blocking the foreign matter in the intake ducts and state of the installation of all the intake ducts. Refer to EXPLODED VIEW WITH TORQUE SPECIFICATIONS .

    Is the installation normal?

    YES 

    GO TO STEP 3  .

    NO 

    Repair or replace error-detected parts.

  3. CHECK BATTERY COOLING FAN POWER SUPPLY - 1

    1. Turn ignition switch OFF.
    2. Disconnect battery cooling fan harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between battery cooling fan harness connector terminals as follows.
      Battery cooling fan Voltage
      Connector + -
      Terminal
      T11 1 4 Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 9  .

    NO 

    GO TO STEP 4  .

  4. CHECK BATTERY COOLING FAN POWER SUPPLY - 2

    Check the voltage between battery cooling fan harness connector and ground.

    + - Voltage
    Battery cooling fan
    Connector Terminal
    T11 1 Ground Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    GO TO STEP 6  .

  5. CHECK BATTERY COOLING FAN GROUND CIRCUIT

    Check the continuity between battery cooling fan harness connector and ground.

    + - Continuity
    Battery cooling fan
    Connector Terminal
    T11 4 Ground Existed

    Is the inspection result normal?

    YES 

    Perform INTERMITTENT INCIDENT .

    NO 

    Repair or replace error-detected parts.

  6. CHECK BATTERY COOLING FAN RELAY POWER SUPPLY

    1. Turn ignition switch OFF.
    2. Remove battery cooling fan relay.
    3. Turn ignition switch ON.
    4. Check the continuity between battery cooling fan relay harness connector and ground.
      + - Voltage
      Battery cooling fan relay
      Connector Terminal
      T36 1 Ground Battery voltage
      5

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    Repair or replace error-detected parts.

  7. PRECONDITIONING

    WARNING:

    Follow the instructions below before starting the procedure.

    1. Disconnect high voltage circuit. Refer to HOW TO DISCONNECT HIGH VOLTAGE .
    2. Check voltage in high voltage circuit. Refer to CHECK VOLTAGE IN HIGH VOLTAGE CIRCUIT .

    GO TO STEP 8  .

  8. CHECK BATTERY COOLING FAN RELAY CONTROL SIGNAL CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect Li-ion battery harness connector.
    3. Check the continuity between Li-ion battery harness connector and battery cooling fan relay harness connector.
      + - Continuity
      Li-ion battery Battery cooling fan relay
      Connector Terminal Connector Terminal
      T28 17 T36 2 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    Check battery cooling fan relay.

    NO 

    Repair or replace error-detected parts.

  9. PRECONDITIONING

    WARNING:

    Follow the instructions below before starting the procedure.

    1. Disconnect high voltage circuit. Refer to HOW TO DISCONNECT HIGH VOLTAGE .
    2. Check voltage in high voltage circuit. Refer to CHECK VOLTAGE IN HIGH VOLTAGE CIRCUIT .

    GO TO STEP 10  .

  10. CHECK BATTERY COOLING FAN CONTROL SIGNAL CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect Li-ion battery harness connector.
    3. Check the continuity between Li-ion battery harness connector and battery cooling fan harness connector.
      + - Continuity
      Li-ion battery Battery cooling fan
      Connector Terminal Connector Terminal
      T28 1 T11 2 Existed
      13 3
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    Perform INTERMITTENT INCIDENT .

    NO 

    Repair or replace error-detected parts.

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