Hello folks - had a question on the wiring for the throttle position sensor (tps). I am going through trouble shooting the cruiser not being able to rev above 2200 rpm, and when I remove/unclip the tps she revs just fine, so I'm pretty sure that it is something to do with the tps (read quite a few good posts on troubleshooting from the forum - I'm at the 'is it the wiring' stage). Wiring all looks fine (I just finished doing the head gasket and inspected the wire harness pretty well before putting it back). The one thing I did do is replace the female clip on the tps - two wires were frayed. I'm worried that I maybe messed up re-wiring hence the malfunction. Is anyone able to verify based on their own working tps, whether the colored wires are in order? Please see a picture of mine below - cruiser is 1997 US model. Many thanks in advance!!
TPS wiring
- Thread starter zimboy83
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
Those wires look reversed to me. Pin 1 should be on the right in that picture.
- Thread starter
- #4
Hey @bpenn1980 - so after tracing all my wires from the wire harness I noticed about 4 that were either shorting or visibly in bad shape.
There is also a test in the FSM to check at the ECU for electrical shorts, and I kept getting a bad reading.
I ended up just splurging and just getting a new wire harness because I was almost 1 month deep into diagnosis lol.
New wire hire harness fixed my issue and car is revving as it should, no check engine light etc!
If you need any more info on the above just tag me here and I can see what I can do!
@jonheld I guess we will never know if my shoddy wiring was really the culprit and I could have saved myself a pretty penny on the wire harness
There is also a test in the FSM to check at the ECU for electrical shorts, and I kept getting a bad reading.
I ended up just splurging and just getting a new wire harness because I was almost 1 month deep into diagnosis lol.
New wire hire harness fixed my issue and car is revving as it should, no check engine light etc!
If you need any more info on the above just tag me here and I can see what I can do!
@jonheld I guess we will never know if my shoddy wiring was really the culprit and I could have saved myself a pretty penny on the wire harness
- Thread starter
- #5
@bpenn1980 - sorry I realize I didn't answer your actual question. Yes it would get to 2200 and then drop to a lower Rev count around 1400. Culprit likely being a short somewhere in the engine harness.
I think you were on the right path with the TPS fwiw. That specific pattern of cycling up to 2200rpm from 1400rpm seems to indicate TPS short. In my case I think it was water in the plug.
I'd like to find a new engine harness for my '94 so I can replace it when I do the head gasket eventually.