C 2500 Truck 2WD V8-379 6.2L DSL VIN J FI (1992)
Pressure Control Solenoid (PCS): Description and Operation
Force Motor Circuit
Purpose:
The force motor takes the place of the throttle valve or vacuum modulator used on past transmissions. It controls transmission line pressure.
Operation:
The force motor controls line pressure by moving a pressure regulator valve against spring pressure. The PCM/TCM varies line pressure based on
engine load. Engine load is calculated from various inputs especially the TPS switch. Line pressure is actually varied by changing the amperage
applied to the force motor from 0 amps at high pressure to 1.1 amps at low pressure. Current to the force motor is periodically pulsed to prevent
contamination from sticking the pressure regulator valve.
Location:
The force motor is attached to the valve body.
