Electronic Pressure Control (EPC) Solenoid

CAUTION:The electronic pressure control pressure output from the variable force solenoid is NOT adjustable. Any modification to the electronic pressure control solenoid will affect the transmission warranty.

DESCRIPTION
The electronic pressure control solenoid is a variable force solenoid. The variable-force type solenoid is an electrohydraulic actuator combining a solenoid and a regulating valve. It supplies electronic pressure control that regulates transmission line pressure and line modulator pressure. This is done by producing resisting forces to the main regulator and the line modulator circuits. These two pressures control clutch application pressures.

SYMPTOMS
Failed on - minimum electronic pressure control pressure (minimum transmission torque capacity). Limited engine torque (partial fuel shutoff, heavy misfire); Flashing transmission control indicator lamp.

Failed off - maximum electronic pressure control pressure, harsh engagements and shifts. May flash transmission control indicator lamp.

DIAGNOSTIC TROUBLE CODES
P1746, P1747