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Home >> Infiniti >> 2018 >> QX30 Essential, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can System (Circuit Diagnosis) >> Circuit Diagnosis >> Can PDEC (Chassis 2) - Low Tire Pressure Warning 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 (chassis 2)
    • Low tire pressure warning control unit

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Securely connect the harness connectors.

  2. CHECK POWER SUPPLY AND GROUND CIRCUIT 

    Check power supply and ground circuit for low tire pressure warning control unit. Refer to Diagnosis Procedure .

    Is the inspection result normal?

    YES

    GO TO 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 (chassis 2)
      • Low tire pressure warning control unit
    3. Check voltage between CAN potential distributor electrical connector (chassis 2) harness connector and ground.

      Terminals

      Voltage

      (Approx.)

      +

      -

      CAN potential distributor electrical connector (chassis 2)

      Ground

      Connector

      Terminal

      M279

      12

      --

      0 V

      13

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair or replace harness.

  4. CHECK CIRCUIT (SHORT TO GROUND) 

    Check continuity between CAN potential distributor electrical connector (chassis 2) harness connector and ground.

    CAN potential distributor electrical connector (chassis 2)

    Ground

    Continuity

    Connector

    Terminal

    M279

    12

    --

    Not existed

    13

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair or replace harness.

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

    Check continuity between CAN potential distributor electrical connector (chassis 2) harness connector terminals.

    CAN potential distributor electrical connector (chassis 2)

    Continuity

    Connector

    Terminal

    Connector

    Terminal

    M279

    12

    M279

    13

    Not existed

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Repair or replace harness.

  6. CHECK CIRCUIT (OPEN) 

    Check continuity between the following unit harness connectors.

    • CAN potential distributor electrical connector (chassis 2)
    • Low tire pressure warning control unit
      CAN potential distributor electrical connector (chassis 2) - Low tire pressure warning control unit

      CAN potential distributor electrical connector (chassis 2)

      Low tire pressure warning control unit

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M279

      12

      M44

      3

      Existed

      13

      4

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Repair or replace harness.

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