Code P022, Open Throttle Position (TP) Sensor: Action

PCM turns on MIL and disables TCC. PCM sets TP sensor equal to 13 degrees when throttle position switch is open and 6 degrees when throttle position switch is closed. PCM disables 3rd and 4th gears.

1. If Code P032 is present, check circuit No. 474 for open or short to ground. TP sensor and MAP sensor share 5-volt signal.
2. With TP sensor or wiring open, PCM data parameter PD01 will read -5 or less.
3. Checks for open TP sensor or wiring. If data value stays less than 80 with TP sensor terminals "A" and "C" jumpered together, problem is in wiring.
4. Voltage should be greater than 0.5 volt if circuit No. 474 is not open or shorted to ground.
5. Checks if circuit No. 474 is open, not open or shorted to ground.
6. Checks if signal is reaching PCM. If signal is reaching PCM, then fault is with PCM.

Fig 1: Code P022 Schematic, Open Throttle Position (TP) Sensor

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code P022 Diagnostic Flow Chart, Open TP Sensor

Courtesy of GENERAL MOTORS CORP.