Technical Throttle Position Sensor - Replacing

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Technical Throttle Position Sensor - Replacing

Just to update on my other post - car went into our local garage at the end of last week, but the fault wasn't replicated and no more error codes showed up. Car has been working absolutely fine since, so just a case of keeping an eye on it I guess!

The garage was really good, they only charged £20+VAT for that particular bit to cover their labour. Also did the car's MOT, and my wife arranged for both front brake pads and front tyres to be replaced as well as they were borderline fails. £250 all in for the whole job which I think is very good going to be fair, plus the joy of not having to deal with Vospers or have to do anything more than walk 10 minutes to the garage!(y)
 
I've now changed the throttle body in mine. Cleared the code, drove up the road and it came back by the time I got to 3rd gear. I now have the replacement pedal with sensor and will be changing it tomorrow. Fingers crossed. It's only 3 bolts and an electrical connection so although it's tricky to get to, hopefully it will do the trick and not take long.
 
Indeed, MES has a "throttle position learning" feature on the adjustments page (F7), but I assume you already tried that with both the original and the new throttle body.
 
I found it. I didn't know about this. Thanks. I will try it in the morning.

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I've cleared the code this morning, done the throttle relearn. Drive up the road, same thing again. I dont think the butterfly valve is opening as it should. When Andy came round last week and I was cleaning his throttle valve while he pressed the peddle, the valve was opening up from horizontal fully closed to vertical fully open and everything in between. Mine hardly opens at all. It's the same as it was before I changed both the pedal and the throttle body. This makes no sense. Is there another sensor? Why would the code say throttle potentiometer even though I've changed both parts.

I keep seeing these pictures of a sensor which I haven't seen before. This sensor is not on the pedal or the body.

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After you clear the code but before you drive the car have someone blip the pedal and look at the butterfly? just wonder if it changes after you start driving. If you turn on the ignition but don't start the car, does the butterfly move with respect to the pedal?, it may not however move.
 
At least on the TA, it won't rev past 3K if you're in gear, so it could be a faulty gear position switch, maybe? That's also a potentiometer. It's located at the base of the shifter (assuming all models have one of course).
 
Update on the TPS error:

Car went into a local independent good garage today to try to find the problem. I've just had a call and they have had it plugged in and say that the TPS and Throttle Body appear to be doing what they are meant to do. They believe there is a voltage problem on another sensor that is on the same circuit.

Sensors on the circuit are the air conditioning refridgerant sensor and the gearbox neutral sensor. I said that the Start/Stop was working fine until the code pops up, but he thinks it's the other way around and that their is a fault with the neutral sensor which is in turn giving false information to the TPS. They are going to continue to do more tests tomorrow.

Hope this gets to the bottom of it. Your thoughts on this possibility?

Hopefully, I'll get a call tomorrow with a result.
 
Just had another call from the garage. It's not the neutral sensor. Has measured voltage on the two lines from the pedal. One is 5v as it should be, the other is high, on occasions nearly 6v. He is going to try with bits of wire to try to get a 5v stable voltage on the high one. Possibly the main a Ecu! Are main ECUs swappable? I have an identical car coming this week which I could take the ECU out if they are swappable.
 
Penultimate update on this, the Garage has found the fault. There are two wires that are 5v feeds from the ECU to the throttle pedal. One of these is bang on 5v the other is fluctuating to 6v. The garage disconnected the one that is too high and temporarily wired it to the one that is correct and the car is behaving properly. It seems that something in the engine ECU is delivering voltage that is too high and this is tripping the error. I have ordered an ECU FROM Club500italia for £64.49 which has the same part number so I'm hoping that it is plug and play. Final update next week when fingers crossed, I get the car back fixed.
 
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