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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Gateway (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> 3CH Can Gateway >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE 

    Check that the following fuse are not blown.

    Signal name Fuse No.
    Battery power supply 20
    Ignition power supply 53

    Is the fuse blown (open)?

    >>

    Replace the blown fuse after repairing the affected circuit if a fuse is blown.

    >>

    GO TO 2.

  2. CHECK POWER SUPPLY CIRCUIT 
    1. Turn the ignition switch OFF.
    2. Disconnect the connector of 3CH CAN gateway.
    3. Check voltage between 3CH CAN gateway harness connector and ground.
      Terminals Condition Voltage(Standard) Voltage(Reference value)
      (+) (-)
      3CH CAN gateway Ground Ignition switch
      Connector Terminal
      M454 8 OFF 6 - 16 V Battery voltage
      5 ON 7 - 16 V Battery voltage

    Is the measurement value normal?

    >>

    GO TO 3.

    >>

    Repair harness or connector.

  3. CHECK GROUND CIRCUIT 

    Check continuity between 3CH CAN gateway harness connector and ground.

    3CH CAN gateway Ground Continuity
    Connector Terminal
    M454 6 Existed
    7

    Does continuity exist?

    >>

    INSPECTION END

    >>

    Repair harness or connector.