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Home >> Geo >> 1989 >> Tracker Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Tests W/Codes >> Code 21, TPS Signal High >> Diagnostic Aids

Diagnostic Aids

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Using a DVOM, TPS voltage should be between .49-.59 volt at closed throttle and 4.95-5.05 volts at wide open throttle.

Fig 1: Code 21, Circuit Wiring Diagram & Flow Chart
G121692Courtesy of GENERAL MOTORS CORP.