tps low - Team Camaro Tech
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post #1 of 3 (permalink) Old May 10th, 06, 06:35 AM Thread Starter
 
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Question tps low

i have a 89 camaro iroc and on the scanner it shows that the tps is low. when i try to adjust it. it doesn't have to much of effect. when i drive the car the service light comes on and goes off. do you have and sugguestion on this problem?
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post #2 of 3 (permalink) Old May 10th, 06, 08:49 AM
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Re: tps low

Check for 5VDC, with a Digital VOM, between terminals "A" & "C" at the TPS - with the key ON.
If the voltage is low, check the wiring connectors and the wiring back to the ECM. ECM should have 5VDC reference voltage between terminal #14, which supplies the TPS, and a good ground.
Bad, corroded and loose connector terminals are a common cause of intermittent faults.
The ground wire loops through several other sensors, so be sure to check any common sensor connectors in the harness.

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post #3 of 3 (permalink) Old May 10th, 06, 09:36 PM
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Scott
 
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Re: tps low

Vintage68 has it correct. I assume the trouble code you are getting is a TPS code.

Another thing to check is the sensor ground at the TPS. It should read .05V or less to the battery negative terminal with the key on. What is the actual TPS voltage reading on the scanner. Most GM TPS's read .5-.6V at idle.
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