1991 Buick Century 3.3L 65k miles

Tiny
DOCHAGERTY
  • MECHANIC
  • 1991 BUICK CENTURY
What does it indicate when fault codes can not be erased. I have a century limited that I have had for too
long now and the damn thing will not let me erase the faults 22 and 43. I have left the battery disconnected
overnight to no avail.
this is starting to look like it is time to replace the PCM
any ideas anyone
Friday, November 2nd, 2007 AT 1:59 PM

4 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
To clear the codes,turn the key on and ground terminal B on the ALDL connector Thurn the key off and remove the control mod fuse for 10 seconds, replace the fuse and the ground lead.
Then do a field service check if the codes clear!


https://www.2carpros.com/forum/automotive_pictures/62217_ALDL_2.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_Knock_copy_1.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_Field_service_copy_1.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_TPS_copy_1.jpg

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Friday, November 2nd, 2007 AT 2:28 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,603 POSTS
Thanks merlin, I will start over and follow your suggestion
and let you know
Dr. Hagerty
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Friday, November 2nd, 2007 AT 4:43 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,603 POSTS
Codes still present after multiple attempts to clear
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Saturday, November 3rd, 2007 AT 6:39 AM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Did you try tracing the knock sensor yet? Try removing the battery cable and unpluigging the ecm.
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Saturday, November 3rd, 2007 AT 9:46 AM

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