1991 buick century 3.3L 65k miles

1991 BUICK CENTURY
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DOCHAGERTY
  • ✓Experienced Mechanic
  • 9,606 POSTS
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
Nov 2, 2007 at 6:59 AM
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MERLIN2021
  • ✓Experienced 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://images.2carpros.com/forum/automotive_pictures/62217_ALDL_2.jpg


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


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


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

Nov 2, 2007 at 7:28 AM
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DOCHAGERTY
  • ✓Experienced Mechanic
  • 9,606 POSTS
Thanks merlin, I will start over and follow your suggestion
and let you know
Dr.Hagerty
Nov 2, 2007 at 9:43 AM
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DOCHAGERTY
  • ✓Experienced Mechanic
  • 9,606 POSTS
codes still present after multiple attempts to clear
Nov 2, 2007 at 11:39 PM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
Did you try tracing the knock sensor yet? Try removing the battery cable and unpluigging the ecm...
Nov 3, 2007 at 2:46 AM
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