1982 Corvette-Voltmeter Test on Throttle Position Sensor
Thread Starter
Racer
Joined: Aug 2007
Posts: 278
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From: New Rochelle New York
1982 Corvette-Voltmeter Test on Throttle Position Sensor
Hi,
I do not know much about cars. I have a digital voltmeter and want to check the voltage on my throttle position sensor. Pulling a code 22 which is TPS voltage is too low. I know where the TPS is located and where to place the leads. There is also an adjustment screw to modify the voltage input. My question is when testing:
1) Should the engine be running
2) Should the engine be shut off
3) Should I just turn the ignition switch to on position
4) Should I just turn the ignition switch to accessory position
Thanks
I do not know much about cars. I have a digital voltmeter and want to check the voltage on my throttle position sensor. Pulling a code 22 which is TPS voltage is too low. I know where the TPS is located and where to place the leads. There is also an adjustment screw to modify the voltage input. My question is when testing:
1) Should the engine be running
2) Should the engine be shut off
3) Should I just turn the ignition switch to on position
4) Should I just turn the ignition switch to accessory position
Thanks
Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Hi,
I do not know much about cars. I have a digital voltmeter and want to check the voltage on my throttle position sensor. Pulling a code 22 which is TPS voltage is too low. I know where the TPS is located and where to place the leads. There is also an adjustment screw to modify the voltage input. My question is when testing:
1) Should the engine be running
2) Should the engine be shut off
3) Should I just turn the ignition switch to on position
4) Should I just turn the ignition switch to accessory position
Thanks
I do not know much about cars. I have a digital voltmeter and want to check the voltage on my throttle position sensor. Pulling a code 22 which is TPS voltage is too low. I know where the TPS is located and where to place the leads. There is also an adjustment screw to modify the voltage input. My question is when testing:
1) Should the engine be running
2) Should the engine be shut off
3) Should I just turn the ignition switch to on position
4) Should I just turn the ignition switch to accessory position
Thanks
1. Connect DVM to the TPS sensor.
2. Key to ON, engine OFF.
3. Should read .525V if correct.
4. If it doesn't read that, barely loosen two screws enough to just move the sensor and make the adjustment and get the reading as close as you can to .525V.
5. Tighten screws and your done.
6. NOTE: As you tighten the screws, the voltage may wonder and you may have to play with the TPS sensor to get it where you want it.
The reason you set the TPS that way is so that the ECM knows where idle is by the blade angle.
Another NOTE: If you mess with the TB balance in any way, you MUST reset the TPS sensor again to .525V so the ECM knows where idle is. Also, if you don't have a GM service Manual, you really need to get one to work on that car. Lots of good info in it including how to adjust TPS sensor. eBay usually has one. Good Luck.
Last edited by Buccaneer; Aug 13, 2017 at 05:23 PM.
