ME-SFI idle speed control function

P07.61-3292-06

B6/1 Camshaft Hall sensor

B11/4 Coolant temperature sensor

B17 Intake air temperature sensor

B28 Pressure sensor

B28/5 Pressure sensor downstream of air filter
(on engine 266.980)

B28/6 Pressure sensor upstream of throttle valve actuator
(on engine 266.980)

B37 Accelerator pedal sensor

L5 Crankshaft position sensor

M16/6 Throttle valve actuator

N3/10 ME-SFI [ME] control unit

N15/5 Electronic selector lever module control unit
(with transmission 722.8)

N22 AC control and operating unit (with code (580) Automatic air conditioning)

N22/7 Comfort AC control and operating unit
(with code (581) Comfort automatic air conditioning)

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Y3/9 CVT (continuously variable automatic transmission) electric control unit (with transmission 722.8)

Y62 Fuel injection valves

CAN Controller Area Network (data bus/CAN bus) (CAN)

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Function

The throttle valve actuator controls the idle speed by altering the position of the throttle valve. It is actuated by the ME-SFI control unit.

The ME control unit controls the idle speed with different engine loads (e.g. drive position engaged, refrigerant compressor (A9) activated) according to the input signals..

 The idle speed can be influenced with STAR DIAGNOSIS.

Automatic transmission (transmission 722.8)

When a drive position is engaged, a lower engine speed is controlled in order to reduce the creeping tendency of the vehicle.

The electronic selector lever module control unit passes the information "drive position engaged/not engaged" via CAN to the ME-SFI [ME] control unit .

AC compressor

(with Code (580) automatic air conditioning or Code (581) comfort automatic air conditioning )

In order to avoid the engine speed dropping in the idle speed range when the AC compressor is activated, the AAC [KLA] control and operating unit or the comfort AAC (C-AAC [K-KLA]) control and operating unit supplies a signal via CAN to the ME-SFI [ME] control unit prior to activation of the AC compressor.

The ME control unit upsizes subsequently the opening angle of the throttle valve.