SPEEODMETER AND ODOMETER

1992 GMC Sonoma

Tiny

jestergmc

May, 7, 2011 AT 4:30 PM

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?

13 Answers

Tiny

jestergmc

May, 7, 2011 AT 4:34 PM

I also cleaned plug with electrical cleaner and checked for voltage at the wire and plug.

Tiny

Docfixit

May, 7, 2011 AT 4:41 PM

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

Tiny

jestergmc

May, 7, 2011 AT 5:49 PM

Do I take the reading off the speed sensor? If it read good or bad what are the options?

Tiny

Docfixit

May, 7, 2011 AT 7:13 PM

Yes reading off seed sensor this will tell if signal is being produced

Tiny

jestergmc

May, 10, 2011 AT 8:20 PM

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?

Tiny

jestergmc

May, 10, 2011 AT 8:54 PM

Is there something simple that I am missing?

Tiny

Docfixit

May, 11, 2011 AT 1:52 PM

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

Tiny

jestergmc

May, 14, 2011 AT 4:43 PM

I am having a hard time finding the VSS. Is it on the engine firewall or in the cab?

Tiny

Docfixit

May, 16, 2011 AT 8:12 PM

Info I have firewall next to ECM

Tiny

jestergmc

May, 19, 2011 AT 2:03 PM

Thanks. I found it and fixed it.

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