168 ($A8) Governor Pressure Sensor Volts Too High

NAME OF CODE
168 ($A8) Governor Pressure Sensor Volts Too High

WHEN MONITORED
Continuously with the key on and engine running.

SET CONDITION
The voltage from the Governor Pressure Sensor is above 4.89 volts for 8.5 seconds.

THEORY OF OPERATION
The governor pressure control system is used to regulate governor pressure. Governor pressure is raised or lowered by changing the duty cycle of the governor pressure solenoid. This is done by the Powertrain Control Module (PCM) and is based on input from the Output Speed Sensor. The governor pressure solenoid is normally open, therefore 0% duty cycle provides full governor pressure and 100% duty cycle would provide 0 PSI governor pressure. The governor pressure sensor provides a voltage signal to the PCM. The PCM compares this to the target governor pressure and makes changes accordingly.

TRANSMISSION EFFECTS
Governor pressure solenoid duty cycle is set to minimum. This results in 3rd gear launch. 4th gear (OD) and Torque Converter Clutch (TCC) operation remain unchanged. The Malfunction Indicator Lamp (MIL) is illuminated.

POSSIBLE CAUSES
- Corroded, damaged, pushed out, miswired, or disconnected connector(s)
- Open Governor Pressure Sensor signal circuit
- Governor Pressure Sensor failure
- Governor Pressure Solenoid failure
- Internal controller failure (PCM)