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The mkiv Supra Owners Club

Throttle Position Sensor (TPS) intermittent harsh gear changes and idle problems


TubbyTwo

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Got the TPS pin just waiting on the ecu pin. To run a wire between the two.

 

Ian, to use your method would I just strip back some of the wire insulation both ends and wrap the new wire round the existing and try that way without cutting anything?

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Yes just get a wire around each end with original wire still attached as close to the pin or even around it and see how that goes, but the wire may still be the issue if it is a earthing out fault internitantly so if the temp wire still has the issue then you may have to cut and try it with the old wire not attached at all.

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Got the TPS pin just waiting on the ecu pin. To run a wire between the two.

 

Ian, to use your method would I just strip back some of the wire insulation both ends and wrap the new wire round the existing and try that way without cutting anything?

 

Yes, that's it. There isn't one diagnostic test that will fix this in isolation, what we are doing here is eliminating some things and lowering the probability of others. Getting a multimeter reading of the ecu end of things would also be a good test, see if its a steady voltage and in the right range.

 

- - - Updated - - -

 

Got the TPS pin just waiting on the ecu pin. To run a wire between the two.

 

Ian, to use your method would I just strip back some of the wire insulation both ends and wrap the new wire round the existing and try that way without cutting anything?

 

Yes, that's it. There isn't one diagnostic test that will fix this in isolation, what we are doing here is eliminating some things and lowering the probability of others. Getting a multimeter reading of the ecu end of things would also be a good test, see if its a steady voltage and in the right range.

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Ok thanks :)

 

As soon as multimeter arrives I will be on it. Can't test drive at the moment as my fmic is shot so needs replacing and the large top intercooler hose from the turbos split when taking it off so need to replace that as well.....

 

Still at least the weather us getting warmer.

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  • 4 weeks later...
  • 9 months later...

New year update! Fitted a different tps, possibly managed to set it using a multimeter athough as before not 100% sure its correct. Can ran fine for a few months then was parked up. 4 months later its back on the road and doing the exact same thing again. Tested in TTC works fine. In sequential mode hangs at 3k rpm again although this time gear changes are very smooth. Time to look at the tps wires again. Tempted just to book the damm thing in to Lee and get it sorted.

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  • 1 year later...

Did you ever get to the bottom of this? Tried to PM you TubbyTwo but your inbox is full. I'm having the 3k revs hanging in Sequential but not TTC and pretty much the same issues you've had reading through the thread, really hoping you got to the bottom of what caused it?

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