Can Bus Communication
The E46 utilizes the now familiar "twisted pair" CAN bus wiring configuration for drivetrain and instrument cluster communication interface. The MS 42.0 to GS 20 link is a dedicated CAN circuit. The MS 42.0 is the gateway for data exchange between the GS 20 and Mark 20 EI (traction control) and the instrument cluster. See Fig 1 .
CAN bus data exchange for the GS 20 includes:
- Engine Speed (input).
- Engine Temperature (input).
- Accelerator pedal position and rate of application (input).
- Engine intervention signalling (input and output).
- Shift delay for traction control and warm up phase (input).
- Active shift program (output).
- Cruise control requirements (input).
- Turn recognition (input).
- Current Range and program selection (output).
- Torque Converter lock up signalling (output).
- Transmission fault indication lamp (output).