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Home › Infiniti › 2024 › QX60 Autograph, FWD › Repair and Diagnosis › Engine Performance › System › Engine Control System (DTC/Circuit Diagnosis) (6 Of 6) › DTC/Circuit Diagnosis › Ignition Signal › Component Function Check

Component Function Check

  1. INSPECTION START 

    Turn ignition switch OFF, and restart engine.

    Does the engine start?

    YES-1>>

    With CONSULT : GO TO 2.

    YES-2>>

    Without CONSULT : GO TO 3.

    No>>

    Proceed to Diagnosis Procedure .

  2. CHECK IGNITION SIGNAL FUNCTION 

    SYMBOL With CONSULT

    1. Perform "POWER BALANCE" in "Active Test" mode of "ENGINE".
    2. Make sure that each circuit produces a momentary engine speed drop.

    Is the inspection result normal?

    YES>>

    INSPECTION END

    NO>>

    Proceed to Diagnosis Procedure .

  3. CHECK IGNITION SIGNAL FUNCTION 

    SYMBOL Without CONSULT

    1. Let engine idle.
    2. Read the voltage signal between ECM harness connector terminals under the following conditions with an oscilloscope.
      ECM Condition Voltage signal
      + -
      Connector Terminal Connector Terminal
      F79 153 E32 204 [Engine is running]
      • Warm-up condition
      • Idle speed
        NOTE: SYMBOL The pulse cycle changes depending on RPM at idle
      GNSDB126364Courtesy of NISSAN NORTH AMERICA, INC.
      154
      161
      162
      164
      168

    Is the inspection result normal?

    YES>>

    INSPECTION END

    NO>>

    Proceed to Diagnosis Procedure .

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