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1999 Chevy K2500 7.4L Tps issue


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Hello,

I am having some issues with my k2500 and they are driving me nuts! So I hope some one can help.

So here is what happens, when I clear the code start and run the truck I can drive a little down the road and all seems ok. But then it throws a code P0122, then all goes down hill from here, it begins to run bad. I do not get any other codes than P0122.

So I looked this up and it is an intermittent low voltage on the TPS circuit. I began to troubleshoot this issue:

Checked the three TPS wire to see if any had opens or shorts and they all toned out to where they should be. Two to the VCM and one to ground. I check the one wire that comes from the VCM for 5 volts and it had 5 volts. I also checked this wire for voltage while the truck was running and it had 5 volts. I hooked up a scan tool to the truck and the TPS have .43 volts without the pedal being pushed and 4.4 volts with the pedal being pushed to the floor. So those numbers are within range I believe. I believe I narrowed down what could be wrong, TPS, or VCM? So I went the least expensive route and swapped the TPS, this did not fix it. Does anyone else have any suggestions? Thanks for any help!

 

Paul

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Whenever I have odd electrical issues I always start by checking and cleaning grounds. Engine to frame, frame to battery, etc.

 

Also try jiggling, cleaning or replace ignition switch in steering column. EVERYTHING runs through the ignition switch.

 

I assume you have searched the internet for your problem? Maybe someone else already had similar issue and solved it?

 

That's all the internet mechanic advice I have for now :-)

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