Left Hand Drive

PURPOSE
The Transmission Control Module (TCM) determines shift and converter lockup timing based on signals from the sensors. The valve body solenoids are activated/deactivated accordingly.

OPERATION
The TCM has a self diagnostic program. Component and circuitry malfunctions can be diagnosed with the DRB III tester. Once a malfunction is noted and stored in TCM memory, it is retained even after the problem has been corrected. To cancel a stored malfunction, simply disconnect and reconnect the "Trans." fuse in the TCM harness.

CIRCUIT OPERATION
Vehicles have electronically controlled solenoids in the automatic transmission valve body.

The Transmission Control Module (TCM) receives inputs from the Throttle Position Sensor (TPS) on circuit K22 and the stop lamp switch on circuit K29. Circuit K4 connects to the TCM to provide ground for the TPS signal. The TCM receives the transmission output speed sensor signal on circuit T505. Circuit A14 from fuse 2 in the Power Distribution Center supplies battery voltage to the TCM. Circuit Z12 provides ground for the TCM.

The TCM powers the S1 solenoid on circuit T510, the S2 solenoid on circuit T509 and the S3 solenoid on circuit T508. Circuit Z12 provides ground for the S1, S2 and S3 solenoids.