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1999 GMC Sonoma MISFIRE ON #2 CYLINDER

Tiny
BISHOP6B
  • MEMBER
  • 1999 GMC SONOMA
  • 4 CYL
  • 2WD
  • MANUAL
  • 110,242 MILES
HELLO, I HAVE PULLED ERROR CODE P0200 OUT OF PCM, STATES FUEL INJECTOR MALFUCTION. NOW I HAVE CONNECTED THE NOID TO ALL 4 INJECTOR HARNESS I GET A PULSATING LIGHT FOR #1-3-4 BUT #2 THE LIGHT STAYS ON CONSTANTLY SO THE PROBLEM ISN'T THE INJECTOR IS IT. I HAVE CHECKED THE HARNESS FOR SHORTS CAN'T FIND ANY? PLEASE HELP I DONT WANT TO CHANGE THE PCM YET IF THERES A WAY TO CHECK IT TO MAKE SURE. THANKS
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Sunday, March 30th, 2008 AT 2:11 PM

2 Replies

Tiny
FLEXY5
  • MECHANIC
  • 512 POSTS
One way to test it would be to disconnect the PCM harness at the PCM and perform an Ohm test for a short or for a ground problem on the wires for that injector. If there is no ground short and the resistance is ok, then it is the PCM. You could also just try tapping on the PCM to see if it will start working again. I have had a few times where that has worked. Try that and post back. If you have any other questions, feel free to ask.
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Sunday, March 30th, 2008 AT 6:05 PM
Tiny
BISHOP6B
  • MEMBER
  • 2 POSTS
Thanks flexy5 performed those checks, it was the pcm (bad injector drive). I replaced it and the car is working perfectly. Thanks for the heads up.
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Friday, April 11th, 2008 AT 4:49 PM

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