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Nissan Sentra B18 (2020-2025) Service Manual: Diagnostic Can Communication Circuit

Diagnosis Procedure

Diagnosis Procedure

  1. CONNECTOR INSPECTION

    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).

      • Data link connector

      • 8CH CAN gateway

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    Repair the terminal and connector.

  2. CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

    1. Disconnect the connector of 8CH CAN gateway.

    2. Check the continuity between the 8CH CAN gateway harness connector terminals.

      8CH CAN gateway harness connector

      Continuity

      Connector No.

      Terminal No.

      M37

      13

      29

      Existed

      14

      30

      Existed

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Check the harness and repair or replace the root cause.

  3. CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

    Check the continuity between the 8CH CAN gateway harness connector terminals.

    8CH CAN gateway harness connector

    Continuity

    Connector No.

    Terminal No.

    M37

    13

    14

    Not existed

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Check the harness and repair or replace the root cause.

  4. CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

    Check the continuity between the 8CH CAN gateway harness connector and the ground.

    8CH CAN gateway harness connector

    Ground

    Continuity

    Connector No.

    Terminal No.

    M37

    13

    Not existed

    14

    Not existed

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    Check the harness and repair or replace the root cause.

  5. CHECK TERMINATION CIRCUIT

    1. Remove the 8CH CAN gateway.

    2. Check the resistance between the 8CH CAN gateway terminals.

      8CH CAN gateway

      Resistance (Ω)

      Terminal No.

      13

      14

      Approx. 108 – 132

      29

      30

      Approx. 108 – 132

    Is the measurement value within the specification?

    YES (Present error) >>

    Check CAN system type decision again.

    YES (Past error) >>

    Error was detected in the diagnostic CAN communication circuit.

    NO >>

    Replace the 8CH CAN gateway.

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