Engagement

Engagement

Cruise control is engaged by pressing the SET+ steering wheel switch. On receipt of the input from the SET+ switch, the interface ECU outputs a SET MFL message. Provided the vehicle is in the correct driving configuration, when the ECM receives the SET message it stores the current vehicle speed in memory as the set speed. The ECM then adjusts the throttle as necessary to maintain the vehicle at the set speed, and changes the CAN bus message of cruise control status to active.

The vehicle is in the correct driving configuration, when:
- The brakes are off.
- The gearbox is in drive.
- The vehicle is moving at a road speed between 22 and 125 mph (35 and 200 km/h).
- Electronic Traction Control (ETC) is not active.

On receipt of the cruise control active message on the CAN bus, the instrument pack illuminates the cruise control warning lamp and the interface ECU outputs the hardwired cruise control engaged signal to the EAT ECU. On receipt of the cruise control engaged signal, the EAT ECU adopts the cruise control mode, which uses a gear change map less sensitive to changes of accelerator pedal position, to prevent unnecessary gear changes. This improves operating refinement for a minor loss of performance.