Throttle position sensor

Tiny
WINTERDRU
  • MEMBER
  • 2004 AUDI A4
  • 1.8L
  • 4 CYL
  • TURBO
  • AWD
  • MANUAL
  • 95,000 MILES
My car is throwing a code for throttle position sensor limit too high. I have replaced throttle body and gas pedal assembly and still getting the same code. Not sure what else it could be.
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Wednesday, June 28th, 2017 AT 11:32 PM

5 Replies

Tiny
CARADIODOC
  • EXPERT
Codes related to a sensor voltage too high or too low are almost always due to a broken wire or corroded splice or connector terminal. Fault codes only indicate the circuit or system that needs further diagnosis, or the unacceptable condition. They never say to replace parts or that one is bad. It is possible for a sensor to set a voltage-high code, but it is not very common. Also, be aware you have to manually erase the code, if you did not already. Do not become confused when an old code is still there after the repairs have been completed.
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Thursday, June 29th, 2017 AT 4:22 PM
Tiny
WINTERDRU
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I have erased the code after doing the repairs but it comes up right away. Also there is no throttle response when I hit the gas, but if I press the brake and release it the car goes wide open throttle.
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Thursday, June 29th, 2017 AT 4:25 PM
Tiny
CARADIODOC
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You are working on a throttle-by-wire system that put Toyota in the news a few years ago. Most independent mechanics do not want to work on them for fear of becoming party to any future lawsuits. Most likely the new throttle body assembly needs to be programmed to the vehicle by the dealer. No throttle response is a very common symptom, but I have never heard of one going to wide-open-throttle related to the brakes. Seems like a pretty dangerous condition. I have a suspicion that is another symptom related to what set the fault code.

Can you get to the throttle position sensor to take some voltage readings? To be valid, they will need to be taken while it is plugged in, by back-probing next to the wires where they go into the connector.
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Thursday, June 29th, 2017 AT 4:38 PM
Tiny
WINTERDRU
  • MEMBER
Unfortunately I do not have a voltage meter. This all started when I was trying to get my radiator fans to work so I was pulling fuses and relays to check if they were bad. Afterwards when I went to start the car it had the new check engine light on. I ran the adaptation after putting on the new parts but still have the same code
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Thursday, June 29th, 2017 AT 4:42 PM
Tiny
CARADIODOC
  • EXPERT
When this type of thing happens to me, it is usually due to overlooking something I unplugged or something I broke and did not see. Using the voltmeter is typically the last step in finding the source of the problem. Before that we would use a scanner to view live data and see what the engine computer is seeing for TPS voltage. Without either of those, all you are left with is a visual inspection.
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Thursday, June 29th, 2017 AT 4:55 PM

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