Code 21 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-30-2006, 03:00 PM   #1
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I got code 21. I checked TPS and i get .41 at idle and 4.00 at WOT (engine off)
What the proper TPS voltage should be? I can't find it in tech area.
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Old 07-31-2006, 11:52 AM   #2
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According to the '93 factory shop manual, the voltage at idle should be between 0.2 and 0.74 volts (engine off), so I wouldn't expect 0.41 volts to have set an error code, but make sure the measurement is made when the engine is warm.

I don't believe that the TPS on the '93 is adjustable like the older models were. If yours is adjustable, the 2 mounting holes will be ovular rather than circular, and you can adjust it to a slightly lower voltage at idle. If it'* not adjustable, check the wiring to the electrical connector, and if that'* ok, you may need to replace the TPS sensor.
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Old 07-31-2006, 02:24 PM   #3
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It'* adjustable. I checked and there are no flat spots. I'll try lowering it a bit. If it doesn't help i'll put a new one in.
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