July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnostic Procedures

Fig 1: DTC P0121: Throttle Position Sensor Circuit Insufficient Activity (Steps 1-4)

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Fig 2: DTC P0121: Throttle Position Sensor Circuit Insufficient Activity (Steps 5-14)

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Fig 3: DTC P0121: Throttle Position Sensor Circuit Insufficient Activity (Steps 15-23)

Courtesy of GENERAL MOTORS CORP.