Code 21 at WOT

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04-28-2007, 11:33 AM

subliminal

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Code 21 at WOT

Ive ran my car a few times at the strip and everytime Ive ran it my check engine light comes on after I get a little ways down the track. It only comes on when I have the Throttle wide open for a few seconds, and then after I let off it goes away.

I scanned the code and its a Code 21 (TPS voltage too high) My friend and I checked the TPS and it seems like its working right when we hook a volt meter up to it. Anyone have any ideas? Thanks

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04-28-2007, 08:17 PM

1fastam

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Car: 1991 transam

Engine: 305 30 over long tubes into 3" y

Transmission: 700r4

Axle/Gears: 4:10

Re: Code 21 at WOT

code 21 is tps check for sticking or misadjusted tps plunger check all wiring and connections at the tps and at the ecm adjust or replace tps hope this helps jimmy

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04-29-2007, 08:42 AM

RBob

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Car: check

Engine: check

Transmission: check

Re: Code 21 at WOT

Quote:

Originally Posted by subliminal

The MAF ECMs are picky about the TPS setting. Check and if required set the TPS voltage when the throttle is closed. It needs to be set at .54 volts. Then at WOT the TPS voltage shouldn't go higher then about 4.4 volts. The upper voltage is the critical setting, as when the voltage exceeds a set value the code 21 is thrown.

RBob.