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

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

1. If Code P032 is present, check circuit No. 474 for open or short to ground. TP sensor and MAP sensor share the 5-volt reference signal.
2. With TP sensor or wiring open, PCM data parameter PD01 will read -5 or less.
3. Checks for open TP sensor or circuit. If data value stays less than 80 degrees 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 to see if circuit No. 474 is not open, open or shorted to ground.
6. Checks if signal is reaching PCM. If signal is reaching PCM, then fault is in PCM.

Fig 1: Code P022 Schematic (DeVille)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code P022 Flow Chart (DeVille)

Courtesy of GENERAL MOTORS CORP.