96 Tahoe dies while driving and won't start

Discussion in 'Engine & Drivetrain' started by Nightflyer, Aug 23, 2017.

  1. east302

    east302 Full Access Member

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    Either jumping the pink (voltage feed) to the black stripes (ground via VCM) or battery positive to black stripes would work.

    So the VCM didn't ground any of the eight injectors?

    I'll see if the manual has any further diagnostic for the VCM and let you know.
     
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  2. Nightflyer

    Nightflyer TYF Newbie

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    Yes, the VCM didn't ground them.....:(

    Thank you...:)!!
     
  3. east302

    east302 Full Access Member

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    Here you go. It looks like you're getting a "no" for step #3 so start at #4. The tool mentioned in that step (J 34730-350) and in step 5 is just a noid light. A test light would work as you have done before.

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  4. east302

    east302 Full Access Member

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    Forgot to attach the explanatory material for the above diagnostics table:

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  5. Nightflyer

    Nightflyer TYF Newbie

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    Hi east302,

    That's great...:)! Thank you...!!!

    I can test it on Sunday.

    One question: what is the fuel injector coil test? Something with the ICM?

    Best regards

    Matthias
     
  6. east302

    east302 Full Access Member

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    Here is the GM procedure for that. Best I can tell, it's trying to identify any particular injector with a resistance out of spec, but uses a special tool since, I suppose, each injector lacks an individually accessible connector.

    Since you replaced the injectors, I wouldn't worry about it. The balance test that is referred to in the table measures pressure drop across each injector.

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  7. Nightflyer

    Nightflyer TYF Newbie

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    Ok,

    Installed test light on each injector circuit:

    Ignition on: light is lightly on
    Cranking: light flickers
    diconnecting VCM (red an blue): light is off

    So: is my VCM bad or damaged?
     
  8. east302

    east302 Full Access Member

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    So in step 3 of the table, the answer is "yes"...it flashes on each injector? Correct?

    That means that the VCM is correctly grounding out each injector. If it stayed on constant, then that would mean that the VCM is providing a constant ground, so the injector would be firing at all times and not intermittently like it is supposed to.

    If it is flickering, it doesn't look like a VCM issue.
     
  9. east302

    east302 Full Access Member

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    Regardless if the check engine light is on, is code P0338 stored in the history?
     
  10. Nightflyer

    Nightflyer TYF Newbie

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    Hi,

    It's flickering while cranking and constantly on by ignition on.

    There is no code
     

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