First MJ(s)

[Awesome]

Alright someone help me understand this:

 

With the TPS plugged in, I get maybe 1v at pins A-B (power and ground), pins B-C get wildly varying voltage (with zero throttle activity) from .3-5.18v.

With the TPS unplugged, I get nothing at pins A-B, and pins B-C go to 5.18v steady.

 

Verified with two multimeters.

 

Bad TPS? Or a bad power lead TO the TPS?

[eaglescout526]

Power wire could be messed up. Verifying will require the ECU to be unplugged and verify continuity to the TPS from the ECU input and ECU output. Now I’ll admit, backprobing that damn plug sucks. 

[Awesome]

The TPS was bench-tested today and tested good.

 

I am armed with some schematics and the knowledge that the MAP sensor is also tied to the TPS circuit.

 

Going to check some wires tomorrow.

 

Had a stupid thought too... one of the other things I hooked up was the coolant temp gauge that had previously not been hooked up to anything. Part of me wonders if that's grounding something out that shouldn't be grounded out. I'll have to check to see if I'm somehow getting voltage across it.