1G 1991 proper adjustment for tps?

[kneipperk]

I'm trying to find the correct procedure for adjusting my friends throttle position sensor on his 1991 awd 5spd. His ecu read CEL 14 (tps). He doesn't have a dsmlink and we are using a analog volt meter. I read that the vfaq is wrong and not to measure resistance, but to measure the voltage. I already checked resistance and my meter moves smoothly with the throttle. I came across a post saying .48 - .52 volts at idle... Not sure if thats between pins 1&4 or 2&4? Can anybody clarify the correct procedure for adjusting the 1991 tps?

 

[blktalon3]

Try this one
http://www.plymouthlaser.com/tps.htm

 

[o0GuitarKid0o]

Resistance will work you just have to compare it to another tps and prob need 2 ppl to do it or take it off and test it


Edit use that link it tells you the ohms

 

[19Eclipse90]

From: did i set tps correct?

...for a TPS to be good it has to measure at least 3.5k ohms between 1 and 4 and no more than 6.5k ohms. You can't do anything about that besides measure it.
It also has to while measuring between 2 and 4 change resistance smoothly as you rotate the center shaft.
Those are validation tests to see if you have a good part.

The adjustment requires you to hook the TPS to the throttle body, attach the connector, turn on the ECU and then measure the voltage at pin 2 either by probing the wire at the TPS, probing pin 19 at the ECU, using a datalogger, or the sensor voltage check on a SAFC since it is also connected to the TPS signal, then turning the TPS body until you read about 0.5v as the output voltage.

The TPS output voltage should be measured between pin 2 and sensor ground which happens to be pin 4 on the TPS.

 

[steve]

There are several checks performed by the ECU before it throws a TPS CEL. The key checks I remember are:

Is the TPS > 40% and the IPS still closed?
Is the TPS < 3%?

I've posted why just measuring the TPS resistance is at best hit or miss. The FSM calls out a nominal 0.5v output with the butterfly closed on a stock ECU.

The IPS grounds the signal from the ECU when it's closed. That requires a good ground to the TB which is provided by the ground strap on stock cars. The IPS should open allowing the signal line to float back up to it's biased voltage shortly after the throttle starts to open.

Make sure that the throttle cable actually allows the butterfly to close, set the TPS voltage, and make sure that the IPS works.