Don't have a scan tool yet, but I need to check the TPS voltage tonight. How do you do this? ('95 Camaro LT1)

 

Take a needle from your wife/gf's sewing kit. Pierce the wire with it iirc its the blue one. Set your multimeter to read up to 1v dc put the red lead on the needle, put the black lead on the engine or alt to ground it.

Have to do this with the key on so the circuit is energized. Record reading, should be in the .5-.7v range for idle, up toward 4.5-5v for wot.

 

A few months back when i was troubleshooting, my car had 1 volt with the throttle closed and 6 volts wide open. It was acting really crazy but basically fixed itself. The high voltage at idle would have told the pcm that the throttle was partially pressed wouldn't it?

 

Thanks!

 

Pro94lt, Under normal conditions the PCM will recalibrate the voltage when the key turned on and the engine is not running to TPS = 0%. So TPS=0% can have different voltages. HOWEVER significantly higher voltages at throttle closed will mess this calibration up. Rule of thumb is to keep the TPS voltage below .75 volts at the no throttle (against the stop) position.

 

I dont know you you ever read 6v for wot, since the pcm only supplies 5v to the sensor if the pcm is working correctly. Not saying it didnt happen but thats just .