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  A, ISS  B, OSS  and the engine speed
• Calculated torque transfer of the clutch

The Hot Mode function is used to prevent the clutch from being damaged as a result of excessively high temperatures. When hot mode is active, 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 message center: 

• 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 (572 °F) the clutches are disengaged.