Hot mode

The temperature of the clutch is calculated via a model in the TCM.

The following variables are incorporated in the calculation: 

• Engine torque
• Rotational speed signals from the ISS 1, ISS 2, OSS and the engine speed
• Calculated torque of the clutch

The Hot Mode function is used to prevent the clutch from being damaged as a result of excessively high temperatures. Here, the clutch is engaged more quickly and the engine torque is reduced.

At a calculated clutch temperature at which the clutch lining would suffer heat damage, the following message is displayed on the multi-function display of the instrument cluster: 

• Transmission hot - stop the vehicle or accelerate
• Transmission hot - wait
• Transmission hot - wait 10 minutes.

Once the clutch has cooled down, the message "Transmission ready for operation" is displayed on the multi-function display of the instrument cluster.

At a calculated clutch temperature of more than 300 °C the clutches are disengaged.