LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Volvo >> 2012 >> XC90 Base, AWD >> Repair and Diagnosis >> Body & Frame >> Windows >> Electrical Components - Design And Function >> Transmission Control Module (TCM) (4T65 AWD; 2003-2006) >> Function >> Other Modes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Other Modes

Adaptation 

The transmission control module (TCM) monitors each shift during all driving conditions to ensure consistent and smooth gear shifts. The control module does this by either lowering or increasing the hydraulic pressure used during the shift itself. The changed pressure levels are stored in the control module memory when the car has been switched off and are retrieved on start-up. This provides improved shifting comfort and increased service life.

Adaptation occurs when the following conditions have been met:

Temperature controlled lock-up 

If the transmission temperature increases abnormally as a result of heavy load under high ambient temperature conditions, the torque converter lock-up function is activated as often as possible (temperature controlled lock-up). This reduces slippage and the generation of heat in the transmission. If the temperature is below +20 °C the lock-up function does not engage in order to increase the temperature of the oil more rapidly.