TPS Wiring question on an '89

[EUCWolf]

Sorry if this is the wrong place to ask, or if its already answered, but I've been searching for about half an hour and haven't found an answer so I'm hoping someone can help.

I just finished replacing my injector seats and repairing my aux air valve (3d printing is amazing, I love living in the future) on my 1989 automatic transmission van, and as I was testing it and getting ready to adjust the distributor (as long as I was working on it, I replaced my rather weak coil in the distributor), the TPS connector spontaneously disassembled itself.

I'm confident I can put the wires back in to the connector, but due to the insulation on it, I don't actually have any pictures showing which wire goes to which pin.

13446

It seems like the problem was simply that the pieces on the contacts that keep them from popping out of the connector failed over time, so when i started the van, the shaking of the motor just pulled them fully out of the connector.

So my question is: Does anyone know which of these wires goes to which pin on the TPS?

If it helps at all: Assuming the brown wire is ground (since i get negative voltages on my dmm otherwise), I get 12V on the black wire and 11V on the green wire.

Edit with even more additional info: I'm getting errors 4-3 and 5-1 from the ECU. Im pretty sure 5-1 is because of the TPS being disconnected, and i'm assuming 4-3 is because my starter solenoid wire failed somewhere in the harness and I've run a completely new wire to the starter solenoid straight from the ignition switch.

[EUCWolf]

Update: As I got impatient and tried different arrangements of the wires in the connector, the connector itself disintegrated, so I've ordered a new one and I'm going to put 3 short lengths of wire in it with blade connectors on the ends, then I'll put blade connector receptacles on the wires from the harness so I can just trial and error it without risking destroying another connector. there are only six possible combinations so it should be quick once I put together my testing plug.

I'll update once I figure it out in case anyone else has the same question.

In other news: My fuel pump seems to have failed, so I have to figure out if that too is a wiring issue of if the pump itself is actually dead before I can actually start the van again, though i can at least clear the codes and then turn the ignition on to see if the computer likes the TPS wiring or throws the code again as I try different arrangements.

[EUCWolf]

Another update: After some trial and error, clearing the codes after every attempt, I've now got the rapid blink of success.


[EDIT] I've done more testing after replacing my fuel pump and testing my fuel pressure. While the computer was completely happy with the arrangement, it thought it was always at full throttle.

Assuming the throttle body and TPS are mounted in the van, the correct arrangement is:

Top: Green
Middle: Brown
Bottom: Black


I do not know how the wiring in my 1989 compares to other years of van, but I do know the wiring is different from a '91 celica, which seems to use the same TPS, but with pink wires with stripes for the top and bottom pins.

Hopefully this will help anyone else who winds up in the same situation. I realize that a factory service manual would've gotten me to the answer a lot faster than trial and error, but I don't have an FSM for my van (yet) since people seem to want quite a bit for them on eBay.

Now I just need to figure out why fuel isn't reaching my rail and my van should be good to go again.

Once I've finished the whole process and had a chance to actually drive a bit to make sure nothing fails, I'll probably make a thread about the injector seats and aux air valve face-plate I printed (and include the files and what materials I used, though I'd also happily sell them once I'm sure they are sturdy enough).

[EUCWolf]

Would a mod mind deleting this entire thread? I'm no longer sure at all which way is correct and don't want to be potentially giving out bad information.

The van seems to be happy (rapid blink/no code) and run fine with either of the wire arrangements I've described in this thread, but also my ECU might be failing, so I no longer trust any of the testing methods I've used to "confirm" my findings.

This van is making me feel like I'm losing my mind, seriously. 60 miles of running better than it ever has followed by just completely ******** itself and seemingly cutting power to the ECU, EFI, and Ignition systems.

[Coryyyv]

Hello reopening this thread I need help with replacing my TPS sensor connector I have the replacement connector I just want to know if it’s the same order as the old one as far as which wires to connect the colors are different the original from looking from the top goes “black,red,green” and my new one goes “blue,black, red” would I match the blue to the green and then obviously the others match? Thank you it’s for my 1989 cargo van