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Tps Voltage Issues

Keeper

By Keeper,
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Keeper Experienced

Keeper

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My TPS gives a 0.40V signal to my PowerFC when IGN ON engine stopped, but when the engine is started the voltage increases approx 0.1V to 0.50V.

I'm having problems with the ATTESSA and it's fault code is 21, TPS. So I keep resetting the TPS, I can sometimes get 5-10 kms out of the car, but if i back off the gas and roll up to lights it will then fault again. I checked a friends car yesterday and his keeps the same voltage if the car is running or not. Should I look at replacing TPS, or try a different ECU?

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https://www.sau.com.au/forums/topic/357127-tps-voltage-issues/
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89CAL Grand Master

89CAL

Posted
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It could be dependent on your voltage strength through the wiring. When you turn the car on and the alternator is powering everything up to around 14.5v, you will possibly get a slightly higher reading, just a guess but anyway.

0.4v will be outside the readable range (0.5-4.5v). Have you tried turning the TPS a bit?

Keeper Experienced

Keeper

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Thanks for the reply. I tried it again at .5volts and I got it running got till the car got warm. I'm having trouble understanding the workshop manual, but I believe I need to set it .5 or just a tad over e.g. .51 when IGN on but ENGINE OFF. My tsp flickers a little by 0.01 when running. And this needs to all be set at normal operating temperature, does this sound right.

Keeper Experienced

Keeper

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Reset TPS tonight; 0.5Volts IGN ON and Engine Stopped, 0.55Volts IGN ON and Engine Running, Faulted in 1-2 mins driving

After 10-15 mins drive I tried to reset it as the voltage was now reading; 0.47 Engine Stopped, 0.53 Engine Running

Reset to 0.50 Engine Stopped, 0.55 Running faulted in 1-2 mins driving, then without any changes I drove home, this was the best I had all night, the 4WD still faulted, but took 10 minutes of driving to do so, and occured when stationary.

Most of the time the car is either, stationary, coasting down a hill, or low RPM turning tightly when the TPS error seams to kick in on the 4WD.

Getting a constand 13.5-13.7Volts on the PowerFC display, and my battery is now in the boot, but with that sort of ECCU voltage it shouldn't be haing any effect.

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