DTC 73

Diagnostic Trouble Code (DTC) 73:

Pressure Control Solenoid Circuit.:

CIRCUIT DESCRIPTION
The pressure control solenoid is a Powertrain Control Module (PCM) controlled device used to regulate transmission line pressure. The PCM compares Throttle Position (TP) voltage, engine RPM and other inputs to determine the appropriate line pressure for a given load. The PCM will regulate the pressure by applying a varying amperage to the pressure control solenoid. The applied amperage can vary from 0.1 to 1.1 amp. The PCM then monitors the amperage at the return line.

DTC 73 WILL SET WHEN:
The return amperage varies greater than 0.16 amp from the commanded amperage for at least one second, and no DTC 75 stored.

ACTION TAKEN (PCM will default to):
Full line pressure will be applied causing harsh shifts. DTC 73 will be stored in the PCM memory but will not turn "ON" the Malfunction Indicator Lamp (MIL).

DTC 73 WILL CLEAR WHEN:
The fault condition(s) no longer exist, and the ignition switch is cycled "OFF" then "ON."

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

1. This test checks the ability of the PCM to command the pressure control solenoid
2. This test checks for voltage at PCM.

DIAGNOSTIC AIDS
Check for poor connections at PCM and at transmission connector.