Traction Control Mode

Traction Control Mode is an adaptive mode, which is automatically engaged when a traction event occurs. When driving on slippery surfaces (i.e. sand, ice) it is possible for the driven wheels to begin to spin. The TCM believes the vehicle speed is increasing and therefore it may begin to upshift. These upshifts reduce the torque at the wheel and so tend to reduce wheel slip. The downshift lines are forced downwards to prevent unwanted shifts. To reduce the effects of this, if a traction event occurs a signal is transmitted by the ABS module to the TCM over the CAN network, the TCM uses this signal to change the currently selected shift map. The new shift map will have gearshift lines further apart, thus inhibiting the transmission shifting to a lower gear.