GF30.22-P-0003AM ME-SFI Idle Speed Control, Function

GF30.22-P-0003AM ME-SFI Idle Speed Control, Function
ENGINE 113.990 in MODEL 211, 219
ENGINE 113.991 in MODEL 215, 220
ENGINE 113.992 in MODEL 230 up to Model Year 2008
ENGINE 113.993 in MODEL 463 up to 31.5.12
ENGINE 113.995 in MODEL 230 up to Model Year 2008





B11/4 Coolant temperature sensor
B37 Accelerator pedal sensor
L5 Crankshaft position sensor
M16/6 Throttle valve actuator
N3/10 ME control unit
N15/3 EGS control unit
N22 AAC [KLA] control and operating unit
T1/1-
T1/8 - Cylinder 1 to 8 ignition coils
X11/4 Data link connector

CAN CAN data bus (Controller Area Network)

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.
To assist the idle speed control, the ignition angle can be retarded by as much as a 20° crank angle and advanced by as much as a 20° crank angle.

The ME control unit controls the idle speed in the warm-up phase and at different engine loads (e.g. drive position engaged, refrigerant compressor activated) according to the input signals.

Warm-up phase (heating speed)
In order to bring the catalytic converter more rapidly to its operating temperature, the engine speed is raised from 1100 to 1300 rpm:

^ at coolant temperatures less than 40°C,
^ after each starting procedure,
^ during idling for approximately 20 seconds.

After this time elapsed, the idle speed is increased at a coolant temperature less than 70°C depending on the temperature for about 50 seconds by about 50 to 100 rpm.

Automatic transmission
When a drive position is engaged, a lower engine speed is controlled in order to reduce the creeping tendency of the vehicle.
The information "Drive position engaged/not engaged" is transmitted by the ETC control unit via the CAN data bus to the ME control unit.

AC compressor
Before connecting the AC compressor, the AAC control and operating unit sends a signal via the CAN data bus to the ME control unit to prevent a fall in the rpm at idle speed while connecting the AC compressor. The ME control unit upsizes subsequently the opening angle of, the throttle valve.

Adjusting the ignition angle enables a faster response than adjusting the throttle valve.

The idle speed can be influenced with the STAR DIAGNOSIS.