I need a diagnostic flow chart for code 21.

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Jul 27, 2005 | 08:00 PM

trueburton

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Joined: Mar 2003

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From: Michigan

Car: '88 Red Trans Am w/ T-tops

Engine: 305 TPI

Transmission: T-5

I need a diagnostic flow chart for code 21.

So where can i get the chart or can someone just provide one for me?

Jul 31, 2005 | 11:51 AM

Vader

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A Helms manual should have the diagnostic aides.

Trickster probably already has one scanned.

Has the TPS been replaced or tested?

Jul 31, 2005 | 05:01 PM

trueburton

Thread Starter

Senior Member

Joined: Mar 2003

Posts: 522

Likes: 0

From: Michigan

Car: '88 Red Trans Am w/ T-tops

Engine: 305 TPI

Transmission: T-5

I replaced the TPS with a Wells unit about 2 years ago. I tested this one recently and the voltage is reading correct. I tried replacing the TPS but the same codes kept coming up after clearing the computer. So i returned the TPS and put the 2 year old Wells unit back in. My brother said sometimes these kind of sensors should only be replaced with OEM parts because the ECM can be very fussy. I did find a flow chart too and it came out saying either a bad TPS or bad TPS connector. Any other ideas?