MODEL   215 with ENGINE 113, 137 (except 113.99)

P07.61-2159-09

Shown on example of Controller Area Network bus class C (engine compartment) (CAN-C) in model 220 with engine 112, 113 and code (219) Distronic (DTR) A1 Instrument cluster N3/10 ME-SFI [ME] control unit N15/3 ETC [EGS] control unit N15/5 Electronic selector lever module control unit N22 AAC [KLA] control and operating unit

N47 Traction systems control unit N51 AIRmatic with ADS control unit N63/1 DTR control unit N73 EIS [EZS] control unit N80 Steering column module

Task Data interchange between the individual control units Readying sensor signals for several systems Reducing the number of wires Improving the electromagnetic compatibility Design The data bus consists of a twisted, two-core data line which connects all the participants together in a parallel circuit. The data line lines must not be mixed up (low or high level). The ME-SFI [ME] control unit (N3/10) (except model 124 and model 140), the DAS [FBS] control unit (N73/1) (model 129), the DAS [FBS] radio frequency/infrared control unit (N54/4) (model 129) and the DAS [FBS] radio frequency control unit (N54/3) (model 170) are regarded as terminals as far as bus adaptation is concerned. A terminating resistor of 120 is fitted in each case. Exception: ME-SFI [ME] control unit (N3/10) with engine 120 (each fitted with 240 ). When measuring the resistance on the data line (circuit 15 OFF), the various terminating resistors in the terminals are connected in parallel.

Function The data are transmitted digitally on the data bus at various intervals. The individual data blocks are defined in a protocol and this also states which data are received or transmitted by a control unit. Each connected control unit is able to transmit or receive data. The total of the data blocks, the short pause between 2 transmission intervals and further properties of the data bus are checked constantly. Any faults detected are stored. Vehicles with EIS [EZS] control unit (N73) In the vehicle a distinction is made between a fast Controller Area Network bus class C (engine compartment) (CAN-C) and Controller Area Network bus class B (interior) (CAN-B) which is 6 times slower. The EIS [EZS] control unit (N73) forms the interface (Gateway) for this. This does not apply to vehicles with a central gateway control unit (N93) (except model 203).

Vehicles with central gateway control unit (N93) The central gateway control unit forms the interface (Gateway) between the two data buses (N93) (except model 203). The central gateway control unit (N93) serves as the interface for STAR DIAGNOSIS for all model series.

The new control unit must be coded again when exchanging a control unit. The control unit can be coded via a menu in the handheld tester (up to 07/99) or via STAR DIAGNOSIS.

	CAN data bus, function		GF54.00-P-0005A
	Extended vehicle networking (EVN), function	up to 31.8.03	GF00.19-P-0001S
		as of 1.9.03	GF00.19-P-0001SX

GF54.00-P-0005M

CAN data bus, function

1.7.03

MODEL   215 with ENGINE 275.950 /980

P15.00-2132-08

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] pushbutton 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

P07.61-3322-79

Data flow model 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 pump 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 Gear selector switch DIRECT SELECT 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, left cylinder bank B28/5 Pressure sensor downstream of air filter, 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, before TWC G3/4 Right O2 sensor upstream TWC G3/5 Left O2 sensor downstream TWC G3/6 Right O2 sensor downstream of TWC

N10/2 Rear SAM control unit with fuse and relay module N10/2kQ Charge air cooler circulation pump relay N15/3 ETC [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 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, diagnostic CAN, chassis CAN and central CAN. Routing of all fault memories to the data link connector via diagnosis CAN Memory for production data, global variant coding (model series, national version) and maintenance computer. The ME control unit is the gateway for the drive 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.

ME-SFI control unit, location/task/design/function

GF07.61-P-5000M

GF54.00-P-0005AM

CAN databus, function

11.7.02

MODEL   215 with ENGINE 113.991

P54.00-2334-08

A1 Instrument cluster N2/7 Restraint systems control unit N3/10 motor electronics control unit (motor electronics) N10/6 Left front SAM control unit (models 215, 220) N10/7 Right front SAM control unit (models 215, 220) N10/8 Rear SAM control unit

N10/10 Driver-side SAM control unit (model 230) N10/11 Front passenger SAM control unit (model 230) N15/3 ETC control unit N15/5 Electronic selector lever control unit N22 AAC pushbutton control unit N47-5 ESP, SPS and BAS control unit

N63/1 DTR control unit (with Distronic) N73 DI control unit N80 Steering column module N93 Central gateway control unit X11/4 Data link connector CAN databus (Ccontroller Area Network) CLASS "B" CAN data bus, body CLASS "C" CAN data bus, engine

CAN stands for "Controller Area Network". This is an electrical bus system for carrying data over two wires. The tasks are: Data interchange between the individual control units Readying sensor signals for several systems Reducing the extent of electric wiring Improving the 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 wires of the data line must not be mixed up (low level/ high level). The motor electronics (N3/10ME-SFI) control unit is always a consumer with regard to bus adaptation. A 120 terminating resistor is therefore installed in the motor electronics control unit.

The data are transmitted digitally over the CAN databus 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. In the process recognized faults are stored and placed in the diagnostic trouble code memory. In the vehicle a distinction is made between a fast (500 kbit/s) CAN data bus, engine (CLASS "C") for the drive and chassis systems and the slow (83.3 kbit/s) CAN data bus, body (CLASS "B") for the vehicle interior.

The interface between the two CAN data buses (Gateway) is located in the central gateway control unit (N93). The central gateway control unit also represents the interface between the control units on the CAN data bus and the line to the data link connector (X11/4) for the STAR DIAGNOSIS. The instrument cluster (A1), electronic ignition switch control unit (N73) and steering column module (N80) are connected both with the CAN data bus, body and with the CAN data bus, engine and exchange data with both data bus systems. However, they do not serve as an interface (gateway) between both data bus systems!

When a control unit is replaced, the new control unit must be coded again. This control unit coding is possible via a STAR DIAGNOSIS menu. For CAN data bus, see also wiring diagrams. The international standardized network management "OSEK" (open systems and their interfaces for electronics in vehicles) is used for all control units on the CAN data bus.

ME-SFI control unit position/task/design/function

GF07.61-P-5000AM

GF54.00-P-0005MA

CAN data bus, function

24.3.04

MODEL   215 with ENGINE 113.986

P54.00-2454-08

A1 Instrument cluster N2/7 Restraint systems control unit N3/10 ME-SFI [ME] control unit N10/6 Left front SAM control unit N10/7 Right front SAM control unit N10/8 Rear SAM control unit

N15/3 ETC control unit N15/5 Electronic selector lever module control unit N22 AAC [KLA] control and operating unit N47-5 ESP, SPS [PML] and BAS control unit N63/1 DTR control unit (with Distronic) N73 EIS [EZS] control unit

N80 Steering column module N93 Central gateway control unit X11/4 Data link connector CAN-B CAN data bus, body CAN-C CAN data bus, engine CAN-D CAN data bus diagnosis

CAN stands for "Controller Area Network".This is an electrical bus system for carrying data over two wires. The tasks are: Data interchange between the individual control units Readying sensor signals for several systems Reducing the number of wires Improving the electromagnetic compatibility (EMC) The CAN data bus consists of a special twisted two-core data line that connects all CAN users (control units) in parallel. The two wires of the data line must not be mixed up (low level / high level). The motor electronics (N3/10) control unit is always a consumer with regard to bus adaptation. A 120 terminating resistor is therefore installed in the motor electronics control unit.

The data are transmitted 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. A distinction is made in the vehicle between a fast (500 kbit/s) CAN engine data bus (CLASS C) for the drive and chassis systems and the slightly slower (83.3 kbit/s) CAN body data bus (CAN-B) structure for the vehicle interior. In addition to this the external vehicle diagnosis using STAR DIAGNOSIS also has a CAN data bus diagnosis (CAN-D) with a speed of 500 kbits/s.

The interface between the three CAN data buses (Gateway) is located in the central gateway control unit (N93). The instrument cluster (A1), electronic ignition switch control unit (N73) and steering column module (N80) are connected both with the CAN data bus, body and with the CAN data bus, engine and exchange data with both data bus systems. However, they do not serve as an interface (gateway) between both data bus systems!

When a control unit is replaced, the new control unit must be coded again. This control unit coding is possible via a STAR DIAGNOSIS menu. The international standardized network management "OSEK" (open systems and their interfaces for electronics in vehicles) is used for all control units on the CAN data bus.

ME-SFI [ME] control unit component description

N3/10

GF07.61-P-6000SM