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Home >> Jaguar >> 2004 >> XJ8 Base >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Servicing >> Descriptions & Operation >> Transmission Control Module (TCM) & Main Control Valve Body >> Transmission Shift Selection >> Hot Mode
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Hot Mode

This is one of the adaptive modes the transmission can enter when conditions are correct. When the transmission fluid temperature, chip temp, engine oil temp or coolant temperature becomes hot enough to reach threshold values, the TCM will cause the transmission to enter Hot mode. This mode will automatically engage new shift and lock-up maps to reduce heat generated within the transmission. The shift map will enable the transmission to change to higher gears at lower vehicle speeds and the lock-up map will engage the lock-up clutch at lower vehicle speeds and in lower gears. The effect of this is that less heat will be generated within the transmission due to the effects of lock-up clutch slip and churning effects. There will be forced upshift strategy used in hot mode. To exit hot mode the selector lever must be moved or the brake pedal applied or the accelerator pedal applied 100%, during all of these methods of exiting from hot mode the fluid temperature must be lower than the threshold values.