CAN bus

The CAN bus (Controller Area Network) is a serial bus system, in which all connected stations are equally entitled, i.e. each control unit can both send as well as receive. In other words, the connected control units can "communicate" and exchange information via the lines.

Due to the linear structure of the network, the bus system is fully available for all other stations in the event of one station failing.The connection consists of two data links (CAN_L and CAN_H) which are interference-protected by means of shielding (CAN_S).

At present, the AGS and DME control units are interconnected with this system. Linking in of further control units will follow.

The connected control units must all have the same CAN status. The CAN status can be checked via the diagnosis interface. The CAN status (bus index) is specified on the identification of the relevant control unit connected to the CAN bus.

Following information can be interchanged via CAN with the adaptive electronic transmission control AGS:

• Terminal 15 (ignition ON)
  
• Engine speed
  
• Coolant temperature
  
• Engine load signal
  
• Vehicle speed
  
• Throttle angle
  
• A/C compressor
  
• Engine torque reduction by ignition timing adjustment
  
• Torque converter clutch opened or closed
  
• Selected drive program
  
• Selector lever
  
• Current drive stage
  
• Deceleration fuel cutout active or not active