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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 49 (Can System) >> Can >> DTC/Circuit Diagnosis >> TCU Branch Line Circuit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CONNECTOR 
    1. Turn the ignition switch OFF.
    2. Disconnect the battery cable from the negative terminal.
    3. Check the terminals and connectors of the TCU for damage, bend and loose connection (unit side and connector side).

    Is the inspection result normal?

    YES

    GO TO 2 .

    NO

    Repair the terminal and connector.

  2. CHECK HARNESS FOR OPEN CIRCUIT 
    1. Disconnect the connector of TCU.
    2. Check the resistance between the TCU harness connector terminals.

      TCU harness connector

      Resistance (Ω)

      Connector No.

      Terminal No.

      M173

      6

      7

      Approx. 54 - 66

    Is the measurement value within the specification?

    YES

    GO TO 3 .

    NO

    Repair the TCU branch line.

  3. CHECK POWER SUPPLY AND GROUND CIRCUIT 

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

    Is the inspection result normal?

    YES

    Replace the TCU. Refer to Removal and Installation .

    YES

    Error was detected in the TCU branch line.

    NO

    Repair the power supply and the ground circuit.

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