DTC 73, Pressure Control Solenoid Circuit (Current Error): Notes

Pressure control solenoid is a PCM-controlled device used to regulate transmission line pressure. PCM compares TP voltage, engine RPM and other inputs to determine line pressure appropriate for a given load. PCM will regulate pressure by applying a varying amperage to pressure control solenoid. The applied amperage can vary from .1-1.1 amp. PCM then monitors amperage at the return line. DTC 73 will set when return amperage varies greater than .16 amp from commanded amperage for at least one second and DTC 75 is not set.

PCM will default to full line pressure being applied, causing harsh shifts. DTC 73 will be stored in PCM memory but will not turn on MIL.

1. This test checks PCM's ability to command pressure control solenoid.
2. This test checks internal transmission harness and pressure control solenoid for correct resistance.