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Home >> Infiniti >> 2017 >> QX30 Base >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> LAN System (Can) >> DTC/Circuit Diagnosis >> Can PDEC (Powertrain) - 4WD Control Unit Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK HARNESS CONNECTOR CONNECTION

    Check the following harness connector for disconnection or looseness.

    • CAN potential distributor electrical connector (powertrain)
    • AWD control unit

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Securely connect the harness connectors.

  2. CHECK POWER SUPPLY AND GROUND CIRCUIT

    Check power supply and ground circuit for AWD control unit. Refer to WIRING DIAGRAM .

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Repair or replace the malfunctioning part.

  3. CHECK CIRCUIT (SHORT TO BATTERY)

    1. Turn ignition switch OFF.
    2. Disconnect the following unit connectors.
      • CAN potential distributor electrical connector (powertrain)
      • AWD control unit
    3. Check voltage between CAN potential distributor electrical connector (powertrain) harness connector and ground.
      Terminals Voltage
      (Approx.)
      + -
      CAN potential distributor electrical connector (powertrain) Ground
      Connector Terminal
      M175 4 - 0 V
      5

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Repair or replace harness.

  4. CHECK CIRCUIT (SHORT TO GROUND)

    Check continuity between CAN potential distributor electrical connector (powertrain) harness connector and ground.

    CAN potential distributor electrical connector (powertrain) Ground Continuity
    Connector Terminal
    M175 4 - Not existed
    5

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair or replace harness.

  5. CHECK CIRCUIT (SHORT WITH CAN-H AND CAN-L)

    Check continuity between CAN potential distributor electrical connector (powertrain) harness connector terminals.

    CAN potential distributor electrical connector (powertrain) Continuity
    Connector Terminal Connector Terminal
    M175 4 M175 5 Not existed

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Repair or replace harness.

  6. CHECK CIRCUIT (OPEN)

    Check continuity between the following unit harness connectors.

    • CAN potential distributor electrical connector (powertrain)
    • AWD control unit
      CAN POTENTIAL DISTRIBUTOR ELECTRICAL CONNECTOR (POWERTRAIN) - AWD CONTROL UNIT

      CAN potential distributor electrical connector (powertrain) AWD control unit Continuity
      Connector Terminal Connector Terminal
      M175 4 M48 3 Existed
      5 2

    Is the inspection result normal?

    YES 

    INSPECTION END

    NO 

    Repair or replace harness.

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