No spark, no injector pulse VR V6

[vombil]

Gday guys I recently purchased a vr V6 column that im going to put a V8 into. The V6 in there has given the previous owner grief. Its now got no spark and no injector pulse. He has previously replaced the CAS. He suspects it might be the DMI. Given I dont have the injector pulse or spark does this lend itself to CAS or DMI more or neither? it could still be either of those? thanks in advance!

 

[Immortality]

Most likely some sort of issue related to the ignition system. The PCM can't fire the injectors until it gets a timing signal from the ignition. However you should see one injection pulse when you first hit the key as I believe the PCM fires a priming pulse to help get it started.

The DFI module is the brains of the ignition system but you would need to test he ignition signal output from the DFI

 

[vombil]

yeah im totally useless at elec diagnosis! im good at swapping part though! thanks mate

 

[Immortality]

Fair enough, most people don't have the test gear to diagnose these issues, myself included. Ideally you need a scope meter to be able to properly trace inputs and outputs.

The other option is been able to hook up a diagnostic computer to the PCM (Tech2 or equivalent) and see what that tells you.

 

[vombil]

was the DMI. luckily I didn't rule it out for 1 second... despite it being brand new aftermarket