GF54.00-P-0005M CAN Data Bus, Function

GF54.00-P-0005M CAN Data Bus, Function
MODEL 215, 220 with ENGINE 275.950
MODEL 230 with ENGINE 275.951 up to Model Year 8
MODEL 216, 221 with ENGINE 275.953 up to Model Year 8
MODEL 230 with ENGINE 275.954 up to Model Year 8
MODEL 215, 220 with ENGINE 275.980
MODEL 230 with ENGINE 275.981 up to Model Year 8
MODEL 216, 221 with ENGINE 275.982 up to Model Year 8
MODEL 240 with ENGINE 285.950
MODEL 240 with ENGINE 285.980





Shown on model 215, 220
A1 Instrument cluster
N2/7 Restraint systems control unit
N3/10 ME control unit
N15/3 ETC [EGS] control unit (transmission 722.6)
N15/5 Electronic selector lever module control unit
N22 AAC [KLA] push-button control unit (automatic air conditioning)
N47-5 ESP, SPS [PML] and BAS control unit
N63/1 DTR control unit
N73 EIS [EZS] control unit
N80 Steering column module
X11/4 Data link connector
CAN Data bus
CAN B CAN data bus, body
CAN C CAN data bus, engine





Data flow, model 216, 221
A1 Instrument cluster
A29/1 Front knock sensor (left side of engine)
A29/2 Rear knock sensor (left side of engine)
A30/1 Front knock sensor (right side of engine)
A30/2 Rear knock sensor (right side of engine)
A80 Intelligent servo module for DIRECT SELECT
B4/3 Fuel tank pressure sensor
B4/7 Fuel pressure sensor
B6/3 Camshaft Hall sensor, right cylinder bank
B11/4 Coolant temperature sensor
B17/8 Charge air temperature sensor
L5 Crankshaft position sensor
M1 Starter
M3 Fuel pump
M4/7 Engine and AC electric suction fan with integrated control
M16/6 Throttle valve actuator
M33 Electric air pump
M44 Charge air cooler circulation
N2/7 Restraint systems control unit
N3/10 ME control unit
N10/1 Front SAM control unit with fuse and relay module
N10/1kA Air pump relay
N10/1kC Circuit 87 relay, engine
N10/1kH Circuit 50 relay, starter
N10/1kJ Circuit 15 relay, starter
S16/13 DIRECT SELECT gear selector switch
X11/4 Data link connector
Y31/5 Boost pressure control pressure transducer
Y32 Air pump switchover valve
Y58/1 Purge control valve
Y58/4 Activated charcoal filter shutoff valve
Y62/1... Fuel injector
Y62/12 1st to 12th cylinder
Y101 Divert air switchover valve
B28/4 Pressure sensor downstream of air filter for left cylinder bank
B28/5 Pressure sensor downstream of air filter for right cylinder bank
B28/6 Pressure sensor upstream of throttle valve actuator
B28/7 Pressure sensor downstream of throttle valve actuator
B37 Accelerator pedal sensor
B40 Oil sensor (oil level, temperature and quality)
G2 Alternator
G3/3 Left O2 sensor upstream of CAT
G3/4 Right O2 sensor upstream of CAT
G3/5 Left O2 sensor downstream of CAT
G3/6 Right O2 sensor downstream of CAT
N10/2 Rear SAM control unit with fuse and relay module
N10/2kQ Charge air cooler circulation pump relay
N15/3 EGS control unit
N22/1 AAC [KLA] control unit
N47-5 ESP control unit
N73 EIS [EZS] control unit
N80 Steering column module
N91 ECI ignition system power pack
N92/1 ECI ignition module, right cylinder bank
N92/2 ECI ignition module, left cylinder bank
N93 Central gateway control unit
N118 Fuel pump control unit
B Interior CAN
C Drive train CAN
D Diagnostic CAN
E Chassis CAN
F Central CAN
LIN Local Interconnect Network (LIN)

CAN stands for " Controller Area Network". This is an electrical bus system for carrying data over two wires.
The tasks are:
^ Data transfer between individual control units
^ Readying sensor signals for several systems
^ Reducing the number of electric cables
^ Improving electromagnetic compatibility.
The CAN data bus consists of a special twisted two-core data line that connects all CAN users (control units) in parallel.
The two lines of the data line must not be mixed up (LOW-/High-level).
The data are transferred digitally over the CAN data bus at various intervals. The individual data blocks are defined in a data protocol and it is specified which data are received or transmitted by a control unit.
Each connected control unit is able to transmit or receive data (bidirectional bus). The sum of the data blocks, the short break between two transmission intervals and additional properties of the CAN data bus are checked constantly. Detected faults are stored and placed in the fault memory.

Model 215, 220, 230, 240
In the vehicle a distinction is made between a fast engine CAN data bus (CAN CLASS "C") for the drive and chassis systems and the slightly slower body CAN data bus (CAN CLASS "B") for the vehicle interior.
The interface of the two CAN data buses (Gateway) takes place on model 215, 220 in the electronic ignition switch control unit (N73), which also represents the interface between the control units on the CAN data bus and the line to the data link connector (X11/4) for STAR DIAGNOSIS. The central gateway control unit (N93) takes over these tasks in model 230 and 240.

Model 216, 221
Several CAN data bus systems are available in the vehicle. The central gateway control unit (N93) has the following tasks:
^ Controls the data traffic between the interior CAN, the diagnosis CAN, the chassis CAN and the central CAN.
^ Routing of all fault memories via the diagnosis CAN for data link connector diagnosis
^ Memory for production data, global variant coding (series, country version) and maintenance computer.
The ME-SFI [ME] control unit is the gateway for the drive train CAN and chassis CAN.
When a control unit is replaced, the new control unit must be coded again.
This control unit coding is via a menu of the STAR DIAGNOSIS menu.
CAN data bus, see also wiring diagrams.