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Clearing dtcs

Tiny
BMXWAYNE
  • MEMBER
  • 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 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 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
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  • 58 POSTS
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
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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
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  • 58 POSTS
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
  • MECHANIC
  • 20,761 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
  • 58 POSTS
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
  • MECHANIC
  • 20,761 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
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  • 58 POSTS
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
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  • 58 POSTS
How common is it for an ecm to go bad
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Wednesday, January 19th, 2011 AT 11:59 PM
Tiny
BMXWAYNE
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  • 58 POSTS
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
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
No, you didn't do the proper troubleshooting before doing that and the ECM was not the problem.
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Sunday, February 13th, 2011 AT 12:39 PM
Tiny
BMXWAYNE
  • MEMBER
  • 58 POSTS
Ok I checked my tps as per instructions in chilton manual and it is giving me almost 5 volts at idle position where as the chilton manual says it should only be.45 - 1.25 volts at that position and as I open the throttle the voltage decreases so my question is whether the tps is bad or is the chilton manual wrong
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Thursday, November 24th, 2011 AT 4:15 AM

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