Theory Of Operation

WARNING: This page is about a different variant/trim than selected.

The Transmission Control Output circuit is used to supply power to the Powertrain Control Module (PCM), Transmission Solenoid/Pressure Switch Assembly, Transmission Range Sensor (TRS) and the Line Pressure Sensor/Variable Force Solenoid when in normal operating mode. The purpose of the Transmission Output circuit is to allow the Transmission Control System to turn off the power to these components in the event that the transmission should need to be placed into "limp-in" mode due to a DTC.

After a PCM reset, (ignition switch turned to the run position, or after cranking the engine) the Transmission Control System verifies that the Transmission Output circuit is open by checking for voltage on the Transmission Output circuits before the Transmission Control System request for the circuit to be powered up. The request is sent by a direct circuit control from the PCM to the TIPM. If voltage is detected on the Transmission Output circuits before the request is sent, the DTC will set.