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ABS light comes on?

Tiny
JIGBIM
  • MEMBER
  • 1997 GMC SIERRA
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 249,000 MILES
1. Scan fails.
2. ABS light comes on transmission gets out of sync.
3. Pin 5 in dlc is signal ground, but with key on I read.04 volts could this cause scanner not to link with ecm. My understanding there should be no voltage on pin 4 or pin 5 when grounded used dvm to test.
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Monday, July 1st, 2024 AT 7:19 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Pin 5 is ground so it should never show voltage, but.04 is close to nothing but I would check or replace the ground circuit to be sure you are getting a good connection, here is the wiring diagrams for the ALDL connector so you can see how the system works. I would also check the fuse # 7 in the use panel inside the truck. Check out the images (below). Please let us know what happens.
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Tuesday, July 2nd, 2024 AT 10:03 AM

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