CAN Bus Switching (Automatic gearbox - Jatco) (page 2 of 2)

l Torque reduction status. This message from the ECM informs the EAT ECU of the success of a torque reduction request. l Engine MIL status. This message from the ECM indicates to the EAT ECU that the MIL has been illuminated by the ECM. The EAT ECU will disable OBD fault monitoring. l Hill descent activity status. This message from the ABS ECU informs the EAT ECU that HDC has been requested. Providing the selector lever is in position 1 or R, the EAT ECU enters HDC mode and assists the ABS with engine braking. l Virtual throttle position (diesel only). This message from the ECM informs the EAT ECU of a virtual throttle position when cruise control is enabled and operative. The message is compiled from a combination of main throttle and secondary throttle inputs.

CAN Outputs l Cooling request. Request for additional cooling of the transmission fluid. The ECM switches on, or increases the speed of the cooling and, if fitted, condenser fans. l Current/Target gear. Informs the ECM what gear is currently engaged or, if a gear shift is in progress, the gear to which the gearbox is shifting. Used by the ECM for engine load change prediction. l Gear selector lever position. The EAT ECU transmits a signal to the ECM of the gear selector lever position selected by the driver. The ECM outputs a CAN message to the instrument pack to display the selection in the LCD l Gear shift in progress. Informs the ECM when a gear shift is in progress. Used at idle speed to compensate for engine load changes during the gear shift. l Gearbox fault status. The EAT ECU uses this signal to display the status of the EAT ECU. If a gearbox fault occurs, the EAT ECU will generate this message to alternately display 'F' and '4' in the instrument pack LCD and initiate the default strategy for the gearbox. l Torque reduction request. Requests the ECM to reduce engine torque for a gear shift (equivalent to lifting off the throttle in manual gearbox models). Amount of torque reduction required expressed as a percentage of maximum engine torque. l Gearbox MIL status. The EAT ECU transmits a signal to the ECM that there is a gearbox fault which will increase emissions above an acceptable level. The ECM outputs a message to the instrument pack which illuminates the MIL. l Gear shift mode. This signal is used to display the currently selected gearshift mode, drive, sport or manual, in the instrument pack LCD. This signal is originated from the EAT ECU.