Clio RS throttle body TPS voltage issue.
Long shot but I need some help with addressing the voltage issue I have with the Clio RS throttle position sensor.
The issue is that at wot it goes to 4.90v and it's seen as idleing speed for the ECU and when it does this the engine just bogs down and looses all power. I'm using the original Clio RS throttle position sensor,I can't use the Saxo one as it rotes clockwise and the Clio one anticlockwise. I was told it was possible to calibrate the tps trough the Lexia diagnostic which I bought just for this but there no option for that,only to calibrate the idle stepper motor,I believe it might only be the single plug ECU that has this option? I have a three plug. I've tried swapping wires but it just makes it worse,i also have another Tps from a different brand but it reads the same voltage. The link below is to a YouTube video that shows the voltage change in real time using diagnostic as it makes it a bit easier to understand this way, thanks for any help. https://youtu.be/gR_VfCXP0Dc |
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Failing that, you could fit a throttle stop at about 90% throttle. Anything over about 80% doesn't really affect air flow or power. |
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This is what the throttle body looks like at 4.70volts, anything more it causes the issue described, it's not really a problem for 1st and 2nd gear,3rd can be annoying and 4th and 5th gear aren't very useable if not with light pressure. I did fit a stop using a bolt bolted to the floor and I think I'll go back to it for the time being. |
Very strange as the sensor is virtually identical to the saxo one.
It must be wired different internally I presume? Have you changed any wiring on the engine loom itself? |
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I've got an aftermarket ECU and wiring my TPS took 4 attempts! one of the attemps did have a similar result in that it would only see partial of the sweep. just a thought. Im at a loose end |
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This time I'll write down every combination as I do it just to make sure as I haven't done that last time, thank you for the help. |
Just to update I did try all the combinations but it just makes it worse.
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Peugeot sport added a modification to the 206 Cup cars that used the 48P ECU with a resistive potentiometer.
I've never looked into what they did but I assumed that it was because of the differences between the original 'hall proximity' type position sensor and the resistive type. If you have more than zero volts on the signal wire when the wire is not connected then there must be a 'pull-up' resistor in the ECU. If you remove that resistor you may get a suitable range of voltage. By the way, modifying the throttle spindle is a bad idea. I've seen them crack across the screw hole after a while and the screw then disappears inside the engine, causing lots of damage. |
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Unplugged voltages are: Pin 1: Pin 2: Pin 3: Plugged in. Pin 1: Pin 2: Pin 3: Battery was flat so some voltages might be a bit lower sorry about that. |
Pin 1 is the signal wire and there's obviously a pull-up on that pin.
If you open the ECU and trace back from the pin you'll find a resistor with a higher voltage on the other side of it. Removing the resistor will reduce the voltage on the pin and might solve your problem. |
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I've traced the wire back and it is the number 4B on the ECU pins side.
Second wire from bottom right,above the white wire. Second pin from top left,smaller plug. This is as far as I will go as I don't know what I'm doing and I don't want to ruin my ECU especially as there's Wayne's map on it. |
In the end I just put a 1.8k ohm resistor on the 5v feed wire and the maximum I get is 4,55v which is full load. :y:
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