Mercedes-Benz ML320. Manual — part 806

If the faults described above exist, read out the fault memory. The indicator lamp EPC is only installed on types
129, 140 from about 4/95 to 6/96.

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

Pedal value sensor, location/task/design/ function

GF30.20-P-
4011L

Electronic accelerator/cruise control/idle speed control
actuator location/task/design/function

other than engine 111 EVO

GF30.22-P-
4010F

Throttle valve actuator, location/task/design/ function

Engine 111 EVO

GF30.22-P-
4101GS

Electronic power control indicator lamp,
location/task/design/function

Engine 119.98, 120.98 in
Model 129, 140 up to 5/96

GF30.20-P-
4012L

Motor electronics control unit, location/task/
design/function

other than engine 111 EVO

GF07.61-P-
5000F

Engine 111 EVO

GF07.61-P-
5000GS

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY CAB Throttle Control, Speed Control Systems - 163 Chassis

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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 /95

ENGINE 113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969

ENGINE 119.980 /981 /982 /985

ENGINE 137.970

Fig. 10: Identifying ME-SFI Idle Speed Control Function Diagram

Task

Controlling idle speed in the case of

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY CAB Throttle Control, Speed Control Systems - 163 Chassis

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

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

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY CAB Throttle Control, Speed Control Systems - 163 Chassis

me

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

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY CAB Throttle Control, Speed Control Systems - 163 Chassis

me