CLEARING DTCS

  • Tiny
  • bmxwayne
  • 1993 Pontiac Sunbird
  • 4 CYL
  • FWD
  • manual
  • 231,000 miles

I tried to clear dtcs in my 1993 pontiac sunbird by removing the ecm fuse it was out overnight and the codes are still there please help

Wednesday, January 19th, 2011 AT 12:21 PM

12 Answers

  • Tiny
  • Wrenchtech
  • Expert
  • 19,542 posts

That probably means that they are hard codes and simply resetting immediately. You have to resolve/repair the code issues and not simply try to clear them.

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Wednesday, January 19th, 2011 AT 1:19 PM
  • Tiny
  • bmxwayne
  • Member

They were still there after clearing and before the car had been started again

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Wednesday, January 19th, 2011 AT 9:42 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,542 posts

Yes, many codes can set immediately when the key is turned on.

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Wednesday, January 19th, 2011 AT 9:46 PM
  • Tiny
  • bmxwayne
  • Member

Ok all seven of the codes I am getting according to my chilton manual are supposed to turn the mil light on but it is not does this mean my ecm is going out or what

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Wednesday, January 19th, 2011 AT 11:21 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,542 posts

You never said you were getting that many codes. That does tend to point to a bad ECM but it should still be analyzed further.

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Wednesday, January 19th, 2011 AT 11:24 PM
  • Tiny
  • bmxwayne
  • Member

What can I do to check things out myself I do have a scantool and also a digital multimeter 10megaohms

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Wednesday, January 19th, 2011 AT 11:26 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,542 posts

You're going to have to manually check out each one of those codes and determine if they are false codes or not and then verify all the power and ground supplies to the ECM.

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Wednesday, January 19th, 2011 AT 11:28 PM
  • Tiny
  • bmxwayne
  • Member

Ok so my multimeter and my chilton manual just became my best friends

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Wednesday, January 19th, 2011 AT 11:41 PM
  • Tiny
  • bmxwayne
  • Member

How common is it for an ecm to go bad

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Wednesday, January 19th, 2011 AT 11:59 PM
  • Tiny
  • bmxwayne
  • Member

Ok I replaced the ecm but the codes are still there are they actually stored in the prom chip

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Sunday, February 13th, 2011 AT 4:46 AM

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