ME-SFI [ME] control unit, component description

P07.61-3315-01

View of the engine compartment at the rear left

N3/10 ME-SFI [ME] control unit

N10/1 Front SAM control unit with fuse and relay module

Location

The ME-SFI control unit is located at the left rear of the engine compartment, in the control unit box on the driver side.

Task

The ME-SFI control unit represents the engine control, when connected electrically with the sensors and actuators of engine 275 KE (Kanal-Einspritzung (port injection)).

The following systems and functions are controlled and coordinated by the ME-SFI [ME] control unit according to input signals:

- Ignition system

- Fuel supply

- Injection control

- Electronic accelerator

- Diagnosis and fault storage

- Drive authorization system and immobilizer

- Charge pressure control

- Heat management

- Torque interface

- Alternator interface

- Emission control

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Input and output signals

The following input signals are evaluated by the engine control and issued in the respective output signals:

 Direct input signals

 Direct output signals

 LIN signals

 CAN input signals

 CAN output signals

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Direct input signals

- Tml. 15

- Circuit 30 (fused)

- Tml. 31

- Circuit 87M1

- Front knock sensor (left side of engine) (A29/1)

- Rear knock sensor (left side of engine) (A29/2)

- Front knock sensor (right side of engine) (A30/1)

- Rear knock sensor (right side of engine) (A30/2)

- Tank pressure sensor (B4/3) (with code (494) USA version)

- Camshaft Hall sensor, right cylinder bank (B6/3)

- Coolant temperature sensor (B11/4)

- Charge air temperature sensor (B17/8)

- Pressure sensor downstream of air filter, LH cylinder bank (B28/4)

- Pressure sensor downstream of air filter, right cylinder bank (B28/5)

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- Pressure sensor upstream throttle valve actuator (B28/6)

- Pressure sensor downstream of throttle valve actuator (B28/7)

- Accelerator pedal sensor (B37) - potentiometer 1

- Accelerator pedal sensor - potentiometer 2

- Oil sensor (oil level, temperature and grade) (B40)

- LH O2 sensor upstream of CAT (G3/3) (non-linear oxygen sensor)

- RH O2 sensor upstream of CAT (G3/4) (non-linear oxygen sensor)

- LH O2 sensor downstream of CAT (G3/5) (non-linear oxygen sensor)

- RH O2 sensor downstream of CAT (G3/6) (non-linear oxygen sensor)

- Crankshaft position sensor (L5)

- Throttle valve - actual value potentiometer 1 (M16/6r1)

- Throttle valve - actual value potentiometer 2 (M16/6r2)

- Crash signal from the restraint system control unit (N2/7)

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Direct output signals

- Sensor voltages 1 and 2 (5 V) - engine plug

- Sensor voltages 1 and 2 (5 V) - vehicle plug

- Sensor grounds 1 and 2 - engine plug

- Sensor ground 1 - vehicle plug

- Accelerator pedal sensor - reference ground for potentiometer 1

- Accelerator pedal sensor - reference ground for potentiometer 2

- LH O2 sensor upstream of CAT - oxygen sensor heater

- RH O2 sensor upstream of CAT - oxygen sensor heater

- LH O2 sensor downstream of CAT - oxygen sensor heater

- RH O2 sensor downstream of CAT - oxygen sensor heater

- Engine and air conditioning electric suction fan with integrated control (M4/7) - specified speed of the fan

- Throttle valve - actuator motor (M16/6m1) +

- Throttle valve - actuator motor (M16/6m1) -

- Air pump relay (N10/1kA)

- Terminal 87 relay, engine (N10/1kC)

- Terminal 15 relay (N10/1kD)

- Circuit 50 relay, starter (N10/1kH)

- Circulation pump relay (N10/2kQ)

- ECI ignition module, RH cylinder bank (N92/1)

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- ECI ignition module, LH cylinder bank (N92/2)

- Boost pressure control transducer (Y31/5)

- Air pump changeover valve (Y32)

- Purge control valve (Y58/1)

- Activated charcoal canister shutoff valve (Y58/4)
(with code (494) USA version)

- Cylinder 1 fuel injection valve (Y62y1)

- Cylinder 2 fuel injection valve (Y62y2)

- Cylinder 3 fuel injection valve (Y62y3)

- Cylinder 4 fuel injection valve (Y62y4)

- Cylinder 5 fuel injection valve (Y62y5)

- Cylinder 6 fuel injection valve (Y62y6)

- Cylinder 7 fuel injection valve (Y62y7)

- Cylinder 8 fuel injection valve (Y62y8)

- Fuel injector Cylinder 9 (Y62y9)

- Fuel injector Cylinder 10 (Y62y10)

- Fuel injector Cylinder 11 (Y62y11)

- Fuel injector Cylinder 12 (Y62y12)

- Divert air switchover valve (Y101)

- Engine speed signal (TN)

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LIN signals

- Alternator interface via drive LIN (LIN C1)

CAN input signals

Instrument cluster (A1)

- Fuel reserve signal

Restraint systems control unit (N2/7)

- Crash signal

ETC [EGS] control unit (N15/3)

- Drive position

- Transmission mode

- Actual gear, target gear

- Engine torque reduction request

- Starter enable in selector lever position "P, N"

- Engine idle specified speed (for actuation of the torque converter lockup clutch)

- Status of torque converter lockup clutch

- Emergency transmission control

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AAC control unit (N22/1)

- Specified fan speed request

- Engine torque request

EIS control unit (N73)

- Start enable (drive authorization system)

ESP control unit (N47-5)

- Vehicle speed

- Wheel speed signal

- Brake recognition

- Cruise control request

- Engine torque request

Fuel pump control unit (N118)

- Pulse width modulated (PWM) signal duty cycle (fuel pump actuation 0 to 100 %)

- Self-diagnosis data

- Requested diagnostic data

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CAN output signals

ETC control unit (N15/3)

- Requests for catalytic converter heating

- Switching request

- Engine torque

- Engine coolant temperature

- Engine oil temperature

- Engine speed

- Engine load

- Kickdown

- Engine speed limitation active

- Limp-home mode engine control

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EIS control unit (N73)

- Start enable request (drive authorization system)

Instrument cluster (A1)

- Engine oil level too low

- Circuit 61 signal (generated by ME-SFI [ME] control unit)

- Fuel consumption (the trip computer is informed about the current fuel consumption by means of square-wave pulse packages (1 pulse = 0.2 l/h))

Fuel pump control unit (N118)

- Diagnosis requests

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Design

The housing of the ME-SFI [ME] control unit is made out of diecast aluminum and the cover is made out of corrosion-proof sheet steel. The ME-SFI [ME] control unit is protected against water and dusts.

The housing contains the 32-bit measuring and control electronics for the engine control.

Voltage supply

The ME-SFI [ME] control unit is "circuit 30 secured" and also supplied with voltage for ignition ON by "circuit 87 M1" .

It is fitted in the operating voltage range with short-circuit protection as well as reversed polarity protection.

In certain cases voltage is supplied through several pins connected in parallel by to relief the electrical connectors.

Ground connection

The "tml. 31" ground link consists of several ground lines from electronic ground (LH footwell) (W34/1).

Computer run-on

If the ME-SFI [ME] control unit receives the signal "circuit 15 OFF" a processor run-on of approx. 5 seconds is started.

However, it may also last for several minutes due to various functions (for example, on-board diagnosis (OBD), drive authorization system (DAS), thermal management).

 Assembly operations

Ensure before unplugging the plug on the ME-SFI [ME] control unit that the ignition is switched off and computer run-on has ended. This is to prevent damage to the ME-SFI control unit and save errors in the control units linked to the CAN.

Variants

The engine control variants, such as country and exhaust gas variants, are activated with the Diagnosis Assistance System (DAS) using the variant coding function.

Replacement of the ME-SFI [ME] control unit is not necessary.