Automatic Gearbox Information

Automatic Gearbox Information

Information sent to and from the EAT ECU is transmitted on the CAN bus.

the ECM requires information on gear position to calculate the likely engine load during acceleration and deceleration conditions. the ECM also disables the misfire detection function whenever low range is selected. the ECM receives this information from the transfer box ECU on the CAN Bus.

There are several possible fault codes associated with the CAN bus and the validity of the messages exchanged between the ECM and the EAT ECU. In most cases, the ECM will store engine speed, engine coolant temperature and details of the battery voltage at the time a CAN fault is detected.

If the EAT ECU detects a gearbox fault, it requests the ECM to illuminate the MIL in the instrument pack and to store freeze frame data.