Transaxle Control Module (TCM)

Fig 1: View Of Transaxle Control Module (TCM)

Courtesy of GENERAL MOTORS CORP.

The transaxle control module (TCM) primarily controls shift points and lockup engagement.

The transaxle is controlled by an electronic shift system. The TCM processes input signals. From the information received, the TCM controls the transaxle hydraulic system.

The electronic shift system consists of the following components:

• TCM
• Shift Solenoid (SS1 and SS2)
• Pressure Control Solenoid (PSC)
• Lockup Solenoid
• Input Shaft Speed (ISS) Sensor
• Output Shaft Speed (OSS) Sensor
• Transmission Fluid Temperature (TFT) Sensor
• Park/Neutral Position (PNP) Switch