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GMC
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1991
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Forward Control 6.2 J, Automatic
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Engine Controls - Tests W/Codes - Diesel
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Diagnostic Charts
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Code 23, Throttle Position Sensor MISADJUSTED
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Diagnostic Aids
Diagnostic Aids
Disregard Code 23 if SERVICE ENGINE SOON light goes out when throttle is returned to idle.
Fig 1: Code 23 Schematic & Flow Chart - TPS Sensor Misadjusted