SOLVED: 2003 X5, 3.0l, runs rough, reset on restart?

[StephenVA]

The signal you are reading is what is called a processed value. It will NOT give you a lab scope line wave/steps.

In order to get a true value of TPS readings you will need a lab scope. But there is an alternative. Just read it with the engine off but key on through the OBDC port with a scanner. It will put you in the ball park to see if it functions. When they fail the volt values jump all over so there usually no codes being set, just input the engine management systems can not comprehend so it does stupid stuff. Most shops choose the "when in doubt replace" methodology as it is after all 15 years old and only has a 100 thousand mile cycle life.....

If you purchase the BMW laptop software you can see the values live and any captured failures
Helpful?

[cmelkoni]

StephenVA,

Thanks for the reply. I believe what you are saying is that the "ABSLT TPS %" value from my Actron scanner when the car is running is not a real-time value but is processed. You therefore won't see the expected smooth transition from about 5% at idle to 90% WOT while the car is running. Correct?

I believe you are also saying that you can see the expected smooth transition if you scan with the key on/engine off. However, in this case, throttle must be manually actuated.

Please confirm above.

Yes, I do have BMW laptop software, DIS V57 with K-line cable. I just haven't installed and used it yet which I will do tonight.