ME-SFI idle speed control function - GF30.22-P-0003E
ENGINE 104.941 /943 /944 /991 /994 as of 1/8/96
ENGINE 104.995
with CODE (494a) USA version
with CODE (807) Model year 1997
with CODE (808) Model year 1998
with CODE (498) as of Model year 97 Japanese version
ENGINE 111.921 /942 as of 1.9.98,
111.943,
111.944 as of 1.8.96,
111.946 as of 1.6.98,
111.947/973,
111.975 as of 1.8.96
ENGINE 111.945
in MODEL 208.335 /435 as of 1.6.98,
202.020/080 as of 1.9.98
ENGINE 111.974
with CODE (494a) USA version
with CODE (807) Model year 1997
with CODE (808) Model year 1998
ENGINE 112.910 /911 /912 /913 /914 /916 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /946 /947 /949 /953 /954 /955 /970 /972 /973 /975
ENGINE 113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969
ENGINE 119.980 /981 /982 /985
ENGINE 137.970
Task
Controlling idle speed in the case of
- different engine loads, e.g. power steering turned to full lock, engaging drive mode, switching on AC compressor
- different mixture, e.g. from activated charcoal canister if purging activated (depending on activated charcoal charge)
Function
The actuator EFP/TPM/LLR (additional designation: throttle valve actuator) regulates the idling speed by changing the throttle valve position. It is actuated by the ME-SFI control unit.
The ME-SFI control unit actuates the throttle valve motor (M16/1 m1) in line with the input signals received at the ME-SFI control unit (N3/10).
Heating speed of the catalytic converter
In order to warm up the catalytic converter more rapidly to operating temperature, engine speed is increased in the idle speed range to 1100 up to 1500 rpm for about 20 seconds after each starting procedure at coolant temperatures of < 40 °C. When a Drive position is engaged, engine speed is immediately controlled to a lower value.
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 (N15/3) over the CAN databus to the ME-SFI control unit.
Ignition angle
To assist the idle speed control, the ignition angle can be retarded by as much as 36° crank angle or advanced by as much as 20° crank angle from the calculated specified value.
The control in the idle speed range by altering the ignition angle reacts more rapidly than altering the position of the throttle valve.
The idling speed can be influenced with HHT or the STAR DIAGNOSIS.
AC compressor
In order to avoid engine speed dropping in the idle speed range when the AC compressor is engaged, the AC push-button control unit (N19) or automatic air conditioning push-button control unit (N22) supplies a signal to the ME-SFI control unit (as of approx. 6/96 over CAN) and the opening cross-section of the throttle valve is enlarged.
When the air conditioning unit is switched on and the external temperature exceeds 35° C the idling speed on vehicles delivered from 6/00 is increased for the driving mode selected by about 100 rpm when the switch-on threshold of about 900 rpm is exceeded. This increase is cancelled again when the external temperature drops below 32° C.
Undervoltage
If the engine control unit detects an undervoltage the idling speed is increased until the ignition is switched off for the driving mode selected by about 100 rpm.
If the control unit SBC reports an undervoltage to the engine control unit over CAN the idling speed for the driving mode selected is increased to about 750 rpm.
| Motor electronics control unit, location/task/ design/function | GF07.61-P-5000F | ||
| ME-SFI ignition system function | GF15.12-P-0001F | ||
| ECI ignition system function | Engine 137 | GF15.15-P-3000L | |
| Pedal value sensor, location/task/design/ function | GF30.20-P-4011L | ||
| Coolant temperature sensor, location/task/ design/function | Engine 119, 120 | GF07.04-P-5026F | |
| Engine 104, 111 | GF07.04-P-5026G | ||
| Engine 112, 113, 137 | GF07.04-P-5026A | ||
| Intake air temperature sensor, location/task/ design/function | GF07.04-P-2100F | ||
| ME fuel supply function | Engine 104, 111, 119, 120 in Model 129, 140, 170, 202, 208, 210 | GF07.61-P-3004F | |
| Engine 112, 113, 137 (except in Model 203, 209, 211) | GF07.61-P-3004A | ||
| Engine 112.91/94/95 203 Engine 112.91/94/95, 113.96 in Model 211 Engine 112.912/955, 113.968 in Model 209 |
GF07.61-P-3004P | ||
| Crankshaft position sensor, location/task/ design/function | GF07.04-P-4116F | ||
| Electronic accelerator/cruise control/idle speed control actuator location/task/design/function | GF30.22-P-4010F | ||
| Electronic accelerator pedal emergency running mode function | Engine 120.98 | GF30.20-P-4026F | |
| Engine 104, 111, 112, 113, 119, 137 | GF30.20-P-4026E | ||
| ME-SFI TWC heating-up function | GF07.61-P-3032F | ||
| ETC control unit, location/task | Information on selector lever position P/N and gear engaged in the case of automatic transmission. Transmission 722.6 |
GF27.19-P-4012G | |
| Clutch pedal switch, location/task/function | with MT | GF29.10-P-2100F | |
| SBC control unit, location/task/function | Model 211, 230: Request for increased idle speed | GF42.46-P-4500SL |