Hi all. My flat engine side connector on the TPS tests, adjusts fine. Less then an ohm from the middle ground "B" terminal to ground. I got 4.89V from the ECU feed to A. Adjusted it to 17% of that out C. . ,.83V, throttle closed, back-probing with paper clips, that I sanded a little. (to not tear things shoving them in along side the wire)
So checking the square trans side, I find NO ground. Furthermore, "C" just stays at .6V when I move the throttle. Also no continuity between the two "B's). So I'll dig in to the diagrams now, was wondering if someone could shed some light on this. Shouldent B be grounded on the harness side of the trans side of the TPS?

 

I See now Cruiser answered my question in my injector swap thread, "Grounds to the TCU" . I'll figure my lack of continuity from the B terminal of the harness side of the trans side of the TPS plug, is an issue with my wireing or the TCU it's self.

Side note. I've picked up, (guessed), that all the sensors ground throught the (ECU, PCM, TCU), to protect them from getten juiced from the ground side. (Like for instance someone putten the jumpers on backwards in the dark).

So...dead thread I suppose, unless anyone has any gems of wisdom...

 

Clean your engine dipstick tube stud and all connectors.

Re-test.

Still no ground after that? Wiggle the harness in the engine bay while testing fro ground.

 

Yea, I done did that right off. Somethensfunky. I did find it's a black wire that turns to tan-orange before it goes to D2 on the TCU.

 

Check for continuity from the TPS ground wire to the dipstick stud.

 

Crimeney Pete, on the one hand THANKS!, on the other hand get on the page!

Like I posted, it's fine from the engine side, no ground from B on the trans side. I have the panel off right now looking for D3 on the TCU, I came in for my bigger magnifier to see #'s on the plug. Tried contact cleaner.

Stud was cleaned. I see the TCU has two grounds in the diagram. Suspicious of a bad diode in the TCU? Working.....

 

Where's the other ground?

Shift point logic ground is C5. TCU ground is D7 They end up at g104--dipstick.

So you're trying to determine if D3 has ground in the TCU?.

 

Not exactly. My diagram shows d3 is the black B ground on the trans side of the tps plug. I have a long wire routed around (on the driveway) to check continuity between the plug and D3 on the TCU plug.

 

That is correct. Does D3 at teh TCU have continuity to ground when back probed?

 

On my first, (not triple checked), continuity test, I get nothing to a tan.orange wire 3 pins out form the end of the TCU connector. (I ran an old speaker wire around from the engine, through the open door to the TCU plug)

 

Tan/org is d3. Backprobe it while connected to the TCU and see if you have continuity to ground.

Did you know you spelled renix wrong in your thread title?

I have that exact same calculator as you in my Jeep, too!!

 

OK now just tell me exactly where that's "open" and I'll send you some seria.

Gettn dark and starten to rain. gonna "flintstone" it, with that wire through the mouse hole.

 

What's open? What's seria?

 

The circuit between the B terminal on the trans side of the TPS, and the TCU, and a beer I believe you prefer.

 

So, no continuity from B to D3?

D3 have continuity to ground with harness plugged in and backprobing it?

90, so no C101. Maybe you should just ground B and check your TPS again.