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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can System (DTC/Circuit Diagnosis) >> Circuit Diagnosis >> TCM Branch Line Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK CONNECTOR 
    1. Turn the ignition switch OFF.
    2. Disconnect the battery cable from the negative terminal.
    3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).
      • TCM
      • Harness connector F6
      • Harness connector E4

    Is the inspection result normal?

    >>

    GO TO 2.

    >>

    Repair the terminal and connector.

  2. CHECK HARNESS FOR OPEN CIRCUIT 
    1. Disconnect the connector of TCM.
    2. Check the resistance between the TCM harness connector terminals.
      TCM harness connector Resistance (Ω)
      Connector No. Terminal No.
      F75 33 23 Approx. 54 - 66

    Is the measurement value within the specification?

    >>

    GO TO 3.

    >>

    Repair the TCM branch line.

  3. CHECK POWER SUPPLY AND GROUND CIRCUIT 

    Check the power supply and the ground circuit of the TCM. Refer to Diagnosis Procedure .

    Is the inspection result normal?

    >>

    Replace the TCM. Refer to Removal and Installation .

    >>

    Error was detected in the TCM branch line.

    >>

    Repair the power supply and the ground circuit.