Code 33

CIRCUIT DESCRIPTION
The force motor solenoid is a variable position solenoid whose plunger moves in relation to the current received from the TCM. The TCM uses the force motor solenoid to control line pressure. By changing the line pressure, the TCM controls gear shifts. The TCM determines the proper gear by using electronic inputs to read engine load, engine speed, and vehicle speed. As operating conditions change, the TCM changes the plunger's position by varying the amount of current (amperage) sent through the solenoid.

Line pressure can vary from less than 50 psi to more than 200 psi. The line pressure varies inversely to the amount of current. High current causes low pressure and low current causes high pressure.

TEST DESCRIPTION
Numbers below refer to circled numbers on the diagnostic chart.
1. This test determines if the solenoid windings or wires to the solenoid are open.
2. This test determines if the wiring to terminals 40 and/or 41 of the TCM connector are shorted to voltage.
3. This test determines if the wire between terminal 40 of the TCM connector and the adapter case connector is shorted to voltage.
4. This test determines if the wire at terminal 2(B) of the adapter case connector is shorted to voltage.

DIAGNOSTIC AIDS
Trouble Code 33 sets when the TCM detects a current draw greater than 1.5 amps between terminals 40 and 41. In the event of an electrical failure, the force motor solenoid is turned off, allowing maximum fluid pressure.

CIRCUIT DIAGRAM

Force Motor Solenoid Circuit:

CODE 33 DIAGNOSTIC CHART

Code 33 Diagnostic Chart: