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Nissan Sentra B18 (2020-2025) Service Manual / Electrical & Power Control / Lan System :: Can / Dtc/circuit Diagnosis / Ecm Branch Line Circuit (vehicle Can Communication 1 Circuit)

Nissan Sentra B18 (2020-2025) Service Manual: Ecm Branch Line Circuit (vehicle Can Communication 1 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 terminals and connectors of the ECM 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 ECM.

    2. Check the resistance between the ECM harness connector terminals.

      ECM harness connector

      Resistance (Ω)

      Connector No.

      Terminal No.

      E16

      134

      133

      Approx. 108 – 132

    Is the measurement value within the specification?

    YES >>

    GO TO 3.

    NO >>

    Repair the ECM branch line.

  3. CHECK POWER SUPPLY AND GROUND CIRCUIT

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

    Is the inspection result normal?

    YES (Present error) >>

    Replace the ECM. Refer to Removal and Installation.

    YES (Past error) >>

    Error was detected in the ECM branch line.

    NO >>

    Repair the power supply and the ground circuit.

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