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PCM issues?

Old 12-09-2015, 03:18 PM
Thread Starter
Join Date: Dec 2015
Location: Cedar Falls, Iowa
Posts: 2
Year: 2001
Model: Cherokee
Engine: 4.7L v8
Unhappy PCM issues?

I have a 2001 Cherokee Limited with the 4.7L V8. I got a P0202 Injector Circuit Malfunction - Cylinder 2 code (only code shown). My jeep barley starts and when it does it sounds like its missing bad, RPM's float between 600-1000.

So far I have changed all spark plugs, coil packs, injectors, fuel filter, cam positioning sensor, (not the crank yet since i've heard its a *****) and a couple sensors on the intake. I am still getting the P0202 Injector Circuit Malfunction - Cylinder 2 code...

I've inspected the wiring on injector 2 and it doesn't seem to be an issue, I'm looking at replacing the PCM, think this will do the trick?
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Old 12-10-2015, 05:04 PM
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dave1123's Avatar
Join Date: Nov 2010
Location: Manlius, east of Syracuse, NY
Posts: 11,262
Year: 2000
Model: Grand Cherokee (WJ)
Engine: 4.0L

Back-probe the #2 injector plug and see if you're getting an active pulse signal. It could be as simple as a bent pin on the PCM harness or a bad solder connection.

Don't condemn the PCM before you check out your electrical circuits. The problem is NOT ALWAYS components.

I can't figure out why you changed all the ignition stuff when the code was for the injector.

Last edited by dave1123; 12-10-2015 at 09:42 PM.
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