Question about 2004 Jeep Grand Cherokee

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2004 Jeep G Cherokee diagnostic code open injector

Had the check engine light come. Diagnostic pointed to an open injector on cyl 3. Engine has an intermittent miss. It does not seem to be related to engine temp or atmospheric variables. I changed the injector on # 3 cyl. but still have the problem. Could it be a faulty PCM or perhaps in the wiring harness? Mileage approx 115000.

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  • darryljr23 Jan 10, 2009

    It is the 4.0 six

  • darryljr23 Jan 10, 2009

    It is the 4.0 six

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  • 51 Answers

It could be a faulty pcm or wiring as you stated in you post. the pcm pulses a ground to the injector circuit allowing the solenoid in the injector to activate momentarily are inject fuel into the intake. if you give me the engine size. V8 4.7L or strait 6 cylinder 4.0L and i will post the proper wiring diagram for the fuel injectors to help you out with your battle

Posted on Jan 10, 2009

  • Ernest Stalker
    Ernest Stalker Jan 10, 2009














    FUEL INJECTOR NO. 3 (GAS) - BLACK 2 WAY


    CAV
    CIRCUIT
    FUNCTION

    1
    K13 18YL/WT
    FUEL INJECTOR NO. 3 DRIVER

    2
    F42 18DG/LG
    FUSED AUTO SHUT DOWN RELAY OUTPUT















































































































































































































































  • Ernest Stalker
    Ernest Stalker Jan 10, 2009



    FUEL INJECTOR NO. 3 (GAS) - BLACK 2 WAY


    CAV
    CIRCUIT
    FUNCTION

    1
    K13 18YL/WT
    FUEL INJECTOR NO. 3 DRIVER

    2
    F42 18DG/LG
    FUSED AUTO SHUT DOWN RELAY OUTPUT

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