P0748

Diagnostic Chart:

Schematic:

The Powertrain Control Module (PCM) uses the Pressure Control (PC) solenoid valve in order to regulate the transaxle line pressure. The PC solenoid valve consists of an electrical connector, a coil, an armature, a regulating spring, and a poppet valve. The PC solenoid valve is attached to the upper control body. The PCM compares TP voltage, engine speed, fluid temperature, gear states, and other inputs in order to determine the line pressure appropriate for a given load. The PCM regulates the pressure by applying a varying current to the PC solenoid valve. The applied current varies from 0.1 amps for maximum line pressure to 1.1 amps for minimum line pressure. The PCM then monitors the current at the return line.

DTC PARAMETERS
DTC P0748 will set if PC actual current differs from PC command current by more than 0.16 amps and the following conditions have been met:
^ Ignition voltage is between 8 and 18 volts
^ Engine is running

DIAGNOSTIC AIDS
Extended engine cranking with a weak battery could set DTC P0748.