Pressure Control Solenoid

WITH 4L60-E AUTOMATIC TRANSMISSION

Pressure Control Solenoid Circuit Check:

Pressure Control Solenoid Circuit:

Circuit Description:
The pressure control solenoid is a PCM controlled device used to regulate transmission line pressure. The PCM compares TP percentage, engine RPM, and other inputs to determine the line pressure for a given load. The PCM then regulates the pressure by applying a variable amperage to the pressure control solenoid. The applied amperage varies from 0.1 to 1.1 amps. At low current the line pressure will be high causing harsh shifts. At 1.1 amps the line pressure will be low causing soft shifts.

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 internal transmission harness and the pressure control solenoid resistance.
3. This test checks internal transmission harness and the pressure control solenoid resistance.
4. This test checks for short to ground.

Diagnostic Aids:
Check for poor connections at PCM and the transmission pass-thru connector.