Transmission Solenoid Body

DESCRIPTION
The powertrain control module controls the E40D transmission operation through four ON/OFF solenoids and one variable force solenoid. These solenoids and transmission fluid temperature sensor are housed in the transmission solenoid body assembly. All are part of the transmission solenoid body and are not replaced individually.

The four ON/OFF solenoids operate in the following manner.
- When the solenoid is OFF, the fluid pressure feed is blocked by a check ball. The check ball is held in place by the solenoid piston.
- When the solenoid is turned ON by the PCM, the piston is pulled up, releasing the check ball and allowing fluid pressure to be applied to the check valves, other components controlled by the solenoid, or both.