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Speeodmeter and odometer

Tiny
JESTERGMC
  • MEMBER
  • 1992 GMC SONOMA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
My speedometer and odometer quit working. I replaced the speed sensor on trans. Checked resistance on the stepper motors in cluster. Replaced cluster. Check for voltage going to speed sensor plug=0. Also traced wiring back to firewall. What else can I do?
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Saturday, May 7th, 2011 AT 4:30 PM

13 Replies

Tiny
JESTERGMC
  • MEMBER
  • 8 POSTS
I also cleaned plug with electrical cleaner and checked for voltage at the wire and plug.
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Saturday, May 7th, 2011 AT 4:34 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Raise rear wheels off ground place DVOM meter on AC scale trans in neutral. Rotate tires by hand @3mph meter shloud read.5 - 1 v AC
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Saturday, May 7th, 2011 AT 4:41 PM
Tiny
JESTERGMC
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  • 8 POSTS
Do I take the reading off the speed sensor? If it read good or bad what are the options?
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Saturday, May 7th, 2011 AT 5:49 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Yes reading off seed sensor this will tell if signal is being produced
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Saturday, May 7th, 2011 AT 7:13 PM
Tiny
JESTERGMC
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  • 8 POSTS
I got readings that jumped from 0 to 1.5 but had to turn the wheels at higher speed to get anything? So what does that mean?
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Tuesday, May 10th, 2011 AT 8:20 PM
Tiny
JESTERGMC
  • MEMBER
  • 8 POSTS
Is there something simple that I am missing?
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Tuesday, May 10th, 2011 AT 8:54 PM
Tiny
DOCFIXIT
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Find VSS buffer item F in first diagram on firewall near ECM. Check White Wire term.10 for output to speedo also check input signal from VSS
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Wednesday, May 11th, 2011 AT 1:52 PM
Tiny
JESTERGMC
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  • 8 POSTS
I am having a hard time finding the VSS. Is it on the engine firewall or in the cab?
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Saturday, May 14th, 2011 AT 4:43 PM
Tiny
DOCFIXIT
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Info I have firewall next to ECM
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Monday, May 16th, 2011 AT 8:12 PM
Tiny
JESTERGMC
  • MEMBER
  • 8 POSTS
Thanks. I found it and fixed it.
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Thursday, May 19th, 2011 AT 2:03 PM
Tiny
DOCFIXIT
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Great so it was VSS?
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Thursday, May 19th, 2011 AT 3:32 PM
Tiny
JESTERGMC
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It was a wire grounding out on the fire causing the brake fuse to blow. But I had brake lights the whole time.
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Saturday, May 21st, 2011 AT 1:52 PM
Tiny
DOCFIXIT
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Thanks that was an unusual fault good work finding that
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Monday, May 23rd, 2011 AT 1:42 PM

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