Jims86
Full Access Member
- Joined
- Aug 3, 2010
- Posts
- 5,492
- Reaction score
- 135
- Location
- Patterson,Ca
- First Name
- Jim
- Truck Year
- 1986
- Truck Model
- K10 Suburban Silverado
- Engine Size
- 5.7 TBI
I may take a look at the tps then.
Thanks guys!!! I'm not use to odb1 troubleshooting
If your harness is like the trucks, your TPS plug has a green, a blue, and a black wire.
with the key in the on position, Take a DVOM and probe the - to the black wire terminal, and the + to the green wire terminal. You should see 5v.
if so, plug it back into the TPS, and with The + probe, you can go from the wire side of the plug through the rubber, and probe the blue wire, and you can ground the - anywhere you want, and watch the meter while you rotate the throttle, look for any glitches or dead spots. Closed throttle should be no less than .5v
Wide open should be around 4v.
Assuming you see 5v in the first test, that alone would make me replace the TPS.
The only time you will see voltage code from the ECM is when the Alternator regulator takes a ****, and spikes up over 17v.
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