C 2500 Truck 2WD V8-379 6.2L DSL VIN J FI (1992)
Pressure Control Solenoid (PCS): Testing and Inspection
Force Motor Circuit
Circuit Description:
The force motor is a PCM/TCM controlled device used to regulate transmission line pressure. The PCM/TCM looks at TPS voltage, engine rpm,
and other inputs to determine the line pressure appropriate for a given load, then regulates the pressure by applying a variable amperage to the
force motor. The applied amperage varies from .1 to 1.1 amps.
The PCM/TCM then monitors the amperage at the return line and if the return amperage varies more than .16 amp from the commanded amperage
for a duration of at least 1 second, Code 73 is set. Once code 73 is set, the force motor is disabled and full line pressure will be applied until the
next time the ignition key is cycled. Code 73 will remain stored but the force motor will resume normal function until the conditions for code 73
re-occur.
