Grand Cherokee 2WD V8-5.2L VIN Y (1998)
Governor Pressure Sensor
The governor pressure solenoid valve is mounted in the governor body. The body is bolted to the lower side of the transfer plate. The transfer plate
channels line pressure to the solenoid valve through the governor body. It also channels governor pressure from the solenoid valve to the governor
circuit. It is the solenoid valve that develops the necessary governor pressure.
Transmission Output Speed Sensor
TRANSMISSION SPEED SENSOR
The speed sensor is located in the overdrive gear case. The sensor is positioned over the park gear and monitors transmission output shaft rotating
speed. Speed sensor signals are triggered by the park gear lugs as they rotate past the sensor pickup face. Input signals from the sensor are sent to the
transmission control module for processing. The vehicle speed sensor also serves as a backup for the transmission speed sensor. Signals from this
sensor are shared with the Powertrain Control Module (PCM).
GOVERNOR PRESSURE CURVES
There are four governor pressure curves programmed into the transmission control module. The different curves allow the control module to adjust
governor pressure for varying conditions. One curve is used for operation when fluid temperature is at, or below, 1°C (30°F). A second curve is used
when fluid temperature is at, or above, 10°C (50°F) during normal city or highway driving. A third curve is used during wide-open throttle operation.
The fourth curve is used when driving with the transfer case in low range.
