CCM code 54 "Cranks does NOT run"! '90 MY

[WVZR-1]

Originally Posted by XfireZ51

I'm pretty confused by your post. If you had a VATS problem, motor wouldn't crank. You'd have no juice going to starter.
When you turn ignition ON, do you hear fuel pumps priming? If pumps are not running, it's because there's no signal from ECM indicating that you have ignition or Distributor Reference Pulse. Does the motor try to start and then die or simply not ignite at all?

VATS in a '90 MY and more accomplishes both "crank" and "fuel enable". They're somewhat related but you certainly can have "crank" with NO "fuel enable"! Like I mentioned I have crank and it will crank with key, and I've also used an interrogator. For the ECM to do what you mention the CCM needs to supply either a 30 Hz or 50 Hz signal to it. It may be more technical than that but I believe that's it in "simple terms"!

Fuel enable I believe was accomplished in the late '86+ VATS cars through the "Theft Deterent Module". I believe in '90+ cars it was moved to CCM/BCM component.

'90 MY FSM 8D54 - CCM Code 54 - VATS (Pass-key) FUEL ENABLE CIRCUIT (Fuel enable failure)

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KW - I have but weeks ago and it has run several times since. This time I started the car, idled it for some time and moved it maybe 100 yards. Hours later "cranks - does not run"! I've read where a battery jump start can disable a CCM. Is that what your maybe implying? Could be?

I'd maybe be interested in trying a CCM if someone had one with a "known key resistance" that would save the aggravation of the interrogator! I can have mine rebuit but a used now on loan or very inexpensive could make it run NOW! The diagnostics would be over. I could then just not install the by-pass that shold be here probably Wednesday!



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I'm quite interested in whether the "fuel enable" can be defeated in a "PROM update" and if it's possible I might just consider removing the secondaries and defeating the "fuel-enable" with just one PROM change. I hadn't planned on the secondary removal until next fall (if at all) BUT this situation could change my plan if it can be accomplished.