96 Tahoe dies while driving and won't start

[east302]

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.

 

[Nightflyer]

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

Thank you...!!

 

[east302]

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.

 

[east302]

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

 

[Nightflyer]

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

 

[east302]

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.

 

[Nightflyer]

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?

 

[east302]

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.

 

[east302]

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

 

[Nightflyer]

Hi,

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

There is no code