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Old 24-06-2016   #31
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Throttle Position Sensor - Replacing

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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Last edited by typecastboy; 24-06-2016 at 11:03.
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Old 24-06-2016   #32
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Re: Throttle Position Sensor - Replacing

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.
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Old 24-06-2016   #33
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Re: Throttle Position Sensor - Replacing

I posted a video further up in the thread, the butterfly valve doesn't seem to open fully. Hardly at all in fact.
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Old 24-06-2016   #34
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Re: Throttle Position Sensor - Replacing

No I mean now you've changed the bits, ie is there a difference between start up and revving and actually driving under load conditions?
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Old 25-06-2016   #35
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Re: Throttle Position Sensor - Replacing

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).
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Old 25-06-2016   #36
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Re: Throttle Position Sensor - Replacing

No, I think it's the same. Have booked it into a garage for next Friday. Hopefully they will get to the bottom of it. It's completely baffling me.
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Old 04-07-2016   #37
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Re: Throttle Position Sensor - Replacing

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.
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Old 05-07-2016   #38
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Re: Throttle Position Sensor - Replacing

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.
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Old 09-07-2016   #39
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Throttle Position Sensor - Replacing

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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Old 09-07-2016   #40
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Re: Throttle Position Sensor - Replacing

Bit of a way out thought could you not create a new stable feed using standard components ?
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Old 09-07-2016   #41
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Re: Throttle Position Sensor - Replacing

Glad you've gotten to the bottom of it!
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Old 09-07-2016   #42
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Re: Throttle Position Sensor - Replacing

Quote Originally Posted by John202020 View Post
Bit of a way out thought could you not create a new stable feed using standard components ?

I did ask if he could not just leave the two connected and he said it would be a bodge. I'm selling the car as soon as it's fixed and I didn't want to bodge it. Will lose money on this car now but can't be helped.
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Old 09-07-2016   #43
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Re: Throttle Position Sensor - Replacing

As a positive you've helped the community and you know for future should you have an issue again
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Old 10-07-2016   #44
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Re: Throttle Position Sensor - Replacing

Quote Originally Posted by Pathaleon View Post
As a positive you've helped the community and you know for future should you have an issue again

Absolutely. This forum has helped me so much over the last couple of years. I like to give back. Hopefully it will help others in the future. I've just changed the curtain airbag on my latest acquisition and filmed that too so I will be uploading that soon.
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Old 15-07-2016   #45
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Re: Throttle Position Sensor - Replacing

Another update on this. I bought a replacement ECU from Club500Italia on eBay. They told me that if I get one that has the same part number it would be plug and play, and someone on here suggested the same. It is not the case.

I took the ECU to the garage yesterday, they fitted it and said the car will not even start now. I did think it was too good to be true. They've had the car for 2 weeks now. They are trying other diagnostics today. Hopefully some sort of relearn will work. If not they are getting a dedicated auto electrician in next week.

I can see this costing me an arm and a leg. What a 'mare!!
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