Control Systems: Operation
CAUTION:
Disconnection of the TCM and/or the vehicle battery will cause system adaptions to be lost; this may be apparent by shift quality degradation. Following reconnection, a period of "varied" driving will reinstate adaptions and thus normal operation. Please ensure that the customer is made aware that the adaption period is variable and may occur after hand over, as the transmission re-learns the prevailing driving style.
NOTE:
Should the TCM fail, please ensure that the control housing cooling fan is operating correctly. Failure of the cooling fan MUST be rectified before renewing the TCM and details of a fan failure should accompany the returned TCM.
The TCM processes information received in both analogue and digital form, such as:
- Transmission input speed.
- Transmission output speed.
- Throttle position.
- Pedal demand.
- Gear selector position.
- Engine torque.
- Engine speed.
- Transmission oil temperature.
- Mode switch.
This information is then used by the TCM to control shift energy management and decide which shift program to implement and which gear to select.
The TCM uses the various sensors and inputs to monitor the correct operation of the system and is programmed to take default action and inform the operator when a fault occurs.