Control Module: Description and Operation

INPUT/OUTPUT SIGNAL OF TCM:

TCM FUNCTION
The function of the TCM is to:
- Receive input signals sent from various switches and sensors.
- Determine required line pressure, shifting point, lock-up operation, and engine brake operation.
- Send required output signals to the respective solenoids.



A/T COMMUNICATION LINE

System Description
These circuit lines are used to control the smooth shifting up and down of A/T during the hard acceleration/deceleration.

Voltage signals are exchanged between ECM and TCM (Transmission Control Module).

A/T DIAGNOSIS COMMUNICATION LINE

Component Description
The malfunction information related to A/T (Automatic Transmission) is transferred through the line (circuit) from TCM (Transmission control module) to ECM. Therefore, be sure to erase the malfunction information such as DTC not only in TCM (Transmission control module) but also ECM after the A/T related repair.