LEMON Manuals: Even more car manuals for everyone
Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can System (DTC/Circuit Diagnosis) >> Circuit Diagnosis >> 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?

    >>

    GO TO 2.

    >>

    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?

    >>

    GO TO 3.

    >>

    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?

    >>

    Replace the ECM. Refer to Removal and Installation .

    >>

    Error was detected in the ECM branch line.

    >>

    Repair the power supply and the ground circuit.

scientia non olet · About LEMON Manuals