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Home >> GMC >> 1996 >> C3500 HD 7.4 J, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Gasoline >> Diagnostic Trouble Code Tests >> DTC P0121 - TP Sensor System Performance >> Circuit Description
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Circuit Description

Throttle Position (TP) sensor provides a voltage signal that changes relative to throttle opening. Signal voltage varies from about .5 volt at idle to about 4.5 volts at Wide Open Throttle (WOT). TP sensor signal is one of the most important inputs used by VCM for fuel control and most VCM control outputs.