TPS code technical help wanted

[4bangin318is]

So here is the deal I have been trying to fix my tps code for a while now with no luck I have researched the issue from top to bottom and still no luck.

Peake research tool to retrieve codes since I cant pedal stomp the car(tps fault)

Parts replaced:

Throttle cable
2tps sensors
Cleaned TB and checked for binding going through motion.
Adjusted cable to correct position.

Resistance for both sensors checked out according to Bentley manual.1k-4k ohms. Resistance also changes smoothly through throttle motion.

Harness side is where I think my issue is. When I reset the code with my peake reader and go to fire it up, it will start great and immediatly die and set code. I can start it right up after the code sets and it runs because the DME is setting the correct values for the motor.

My question is on the harness connector is there a way to check for a break in the wire doing an ohm test? I know you can do continuity test which I have already and it checked out. I should probably retest continuity. Does anyone have an ECM pinout for tps wiring for a 95 318is m42?

Any input will not go overlooked. thankyou

[por911]

You might try cleaning up the grounds throughout the engine bay first. See if that does not help. Does the throttle body look bent at all, or a gap? Is the actuation smooth?
regards

[flyfishvt]

What was the brand of TPS that you installed? Its well known that these cars have issues with non OEM sensors. You should also clean the contacts that the on the plug that attaches to the TPS. If your car has ASC look at the ASC throttle body and any hoses that go to it. Take out the ICV and clean it. Did you test for voltage going to the TPS?

It will take some time but search for BMW Service Bulletins on this issue. Start with a simple search for something like M42 service bulletins or M42 TPS bulletins or something similar.

[4bangin318is]

You might try cleaning up the grounds throughout the engine bay first. See if that does not help. Does the throttle body look bent at all, or a gap? Is the actuation smooth?
regards

I did have a pretty rough ground by my front right motor mount. I repaired it about a week ago. Are there any other common grounds that are prone to failing?

Throttle body is smooth. No gaps.


What was the brand of TPS that you installed? Its well known that these cars have issues with non OEM sensors. You should also clean the contacts that the on the plug that attaches to the TPS. If your car has ASC look at the ASC throttle body and any hoses that go to it. Take out the ICV and clean it. Did you test for voltage going to the TPS?

It will take some time but search for BMW Service Bulletins on this issue. Start with a simple search for something like M42 service bulletins or M42 TPS bulletins or something similar.

Both tps sensors are genuine bmw.
TPS cleaned, no asc.
ICV was cleaned as well.
MAF sensor cleaned with crc.
Voltage coming from harness with vehicle running Pins 1,2 and 3 all give 4.9-5.0 volts.

Which I understand should be correct since the wires ar carrying information.

Am I wrong in thinking that?

I have ALLDATA and will check for TSB's on the issue.

[4bangin318is]

Sorry to bring this back from the dead but my tps issues are still there.

I checked continuity again from tps harness back to dme harness.

All three wires are solid. I have read every thread I can find on tps issues like mine with no luck.

[truthbtold]

Sorry to bring this back from the dead but my tps issues are still there.

I checked continuity again from tps harness back to dme harness.

All three wires are solid. I have read every thread I can find on tps issues like mine with no luck.


When I first got this 325is, I had the same issue among others. I got a tps code set, and read a post from a bmw mechanic that mentioned the ICV at the culprit. I also had a weird tranny idiot light on as well and this guy said it's ICV 100%.

I removed ICV and sure enough it was gummed up mostly open. Replaced it and problem solved. I also cleaned ICV with carb cleaner until it passed "rattle test" so I have a backup maybe.

Checked the values with meter and it was within range so...

[4bangin318is]

When I first got this 325is, I had the same issue among others. I got a tps code set, and read a post from a bmw mechanic that mentioned the ICV at the culprit. I also had a weird tranny idiot light on as well and this guy said it's ICV 100%.

I removed ICV and sure enough it was gummed up mostly open. Replaced it and problem solved. I also cleaned ICV with carb cleaner until it passed "rattle test" so I have a backup maybe.

Checked the values with meter and it was within range so...

So you had a code for a tps sensor and it was the ICV?

Thanks for giving some info

Anyone with input will help me, this has been a long headache

[4bangin318is]

Nobody else has any input?

Is it possible for my peake reader to be throwing a tps code and it be something totally different?

[flyfishvt]

What is the 4 digit code you're getting?

[4bangin318is]

What is the 4 digit code you're getting?

My peake reader gives me "OC", peake manual says TPS

Since I cant do a pedal stomp I would guess its 1216, but I am not positive.

I have been researching DIS and INPA, to be able to dig deeper into the dme.

I have also thought that maybe my throttle shaft is tweaked and it doesnt return all the way back, but I have ruled this out earlier because I have cleaned my throttle body and it functions perfectly, also at ignition on and car off my tps "closed ohms is about 1.3k".

Ive cleaned ICV, and it seems to function properly.

Im also thinking maybe DISA

[4bangin318is]

I still havnt had anybody assure me that you can get "faulse" error code readings. Lets say I have a bad ICV but im getting a tps code.

Has it happened to anbody?

[4bangin318is]

Bump for some more advice

[4bangin318is]

UPDATE: I have solved my TPS issue. This update is for people like me that wanted to see the end result of threads started by people that never finished them.

I read through tons of info on this issue and never found a solution. I started my own thread for advice and like always, good info was chimed in and never neglected.

After getting random codes for ECT, TPS, 02 and MAF I started brainstorming what all of these have in common. So I jumped into my bentley manual and started tracing wiring diagrams. There was one wire that went to all of these sensors. It was a BR/BL wire that acted as a signal ground from the DME.

It stumped me for a while because I did numerous continuity tests and everything checked out.

After researching signal, earth and chassis grounding I decided to ground BR/BL wire. As soon as I touched that wire to ground my cars check engine light immediatly went off and idle stabilized.

I know that my car has been running at a certain default values from the DME due to the check engine lights for the last year and a half so I pulled my battery for about a half hour and reinstalled.

Gas mileage is now up at about 480 miles a tank. And throttle response is back.

I know I will eventually need a new DME because it isnt sending signal ground anymore(possibly a bad diode inside?)

Just wanted to say thankyou for everybody that chimed in and tried to help.

It just goes to show that persistance breaks resistance.