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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can System (DTC/Circuit Diagnosis) >> Circuit Diagnosis >> EVTC 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).
      • Electric intake valve timing control module
      • 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 electric intake valve timing control module.
    2. Check the resistance between the electric intake valve timing control module harness connector terminals.
      Electric intake valve timing control module harness connector Resistance (Ω)
      Connector No. Terminal No.
      F91 3 1 Approx. 108 - 132

    Is the measurement value within the specification?

    >>

    GO TO 3.

    >>

    Repair the electric intake valve timing control module branch line.

  3. CHECK POWER SUPPLY AND GROUND CIRCUIT 

    Check the power supply and the ground circuit of the electric intake valve timing control module. Refer to Wiring Diagram .

    Is the inspection result normal?

    >>

    Replace the electric intake valve timing control module. Refer to Removal and Installation .

    >>

    Error was detected in the electric intake valve timing control module branch line.

    >>

    Repair the power supply and the ground circuit.