Circuit Description

Pressure Control (PC) solenoid is used to regulate transmission line pressure. PCM compares TP sensor voltage, engine RPM and other inputs to determine appropriate line pressure for given load. PCM will regulate pressure by applying varying amperage to PC solenoid. Applied amperage can vary from 0.1-1.0 amp. PCM then monitors amperage. DTC P0748 is set if PCM detects a continuous open or short to ground in PC solenoid circuit.