Speedodometer oil pressure gauges

INCUBUS75

MEMBER
1991 CHEVROLET S-10

Electrical problem
1991 Chevy S-10 4 cyl Two Wheel Drive Automatic

I just bought a 91 s10 for my son. The speedodometer intermittently works and the oil pressure gauge when driving is at 80. the truck run pretty good for being that old. I have changed the speed sensor (which still leaks trans fluid through the plug) and that didn't help. I was told to it could be the DRAC/speed buffer (I have no idea what or where it is) or the ground from the DRAC to the ECM. I need help...I am no mechanic!! I believe I changed Brake module (what I thought was the DRAC/buffer) due to the p-brake light staying on. Well that p-brake light is fixed. Please let me know if you can help me. The pic. is what I changed.

3 Replies

MERLIN2021

MECHANIC
17,250 POSTS

Thats the rear anti-lock control unit. The DRAC is under the right side of the dash next to the ECM.

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Monday, February 23rd, 2009 AT 4:01 PM

INCUBUS75

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2 POSTS

And that the drac was next to the ecm. I was told that it might be the ground from the drac to the ecm. I have no idea where the wire is. Looking a a Haynes book I see the wiring diagram that goes from the speed sensor(ppl&w/grn&blk) to the drac then to the speedodometer then to the ecm. I dont know what to do. I hear kind of a winding noise from the instrument cluster but I am not sure if its there when the sppedodo is working. Any suggestions on what I should do?

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Monday, February 23rd, 2009 AT 6:33 PM

MERLIN2021

MECHANIC
17,250 POSTS

These vehicles has a speed sensor amplifier which is a small green box on the wiring harness behind the instrument cluster. I have seen wear they fail and cause the problem you are describing.

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Thursday, February 26th, 2009 AT 1:45 PM