MERCEDES-BENZ ML430 1997 Complete Repair Manual

PEDAL VALUE SENSOR CHARACTERISTIC CURVE WHEN REVERSING FUNCTION - GF30.20-P-4013E
ENGINE 104.943 /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 104.941 as of 1.8.96
ENGINE 111.921 /942 as of 1.9.98,
111.946 as of 1.6.98,
111.944/975 as of 1.8.96,
111.943 /947 /951 /952 /955 /956 /957 /958 /973 /974 /982 /983
ENGINE 111.945
in MODEL 202.020 /080 as of 1.9.98,
208.335/435 as of 1.6.98
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 /9
5
ENGINE 113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969
Pedal value sensor functionactuation determined by the accelerator pedal into an
electrical signal according to the accelerator pedal position.

Pedal value sensor
characteristic curve when
reversing function
GF30.20-P-
4013E

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY CAB Throttle Control, Speed Control Systems - 163 Chassis
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ENGINE 119.980 /981 /982 /985
ENGINE 120.982/983
ENGINE 137.970
Fig. 9: Identifying Pedal Value Sensor Function Diagram

Task
Optimizing driving comfort and safety when reversing.
Design/function
The pedal value sensor characteristic curve is changed if reverse travel is recognized by the ME control unit.
The throttle valve opens more slowly. The entire opening angle in this case is approx. 50%.
Reversing is detected:
if a manual transmission fitted, the ME control unit is connected parallel to the reversing light switch.
if an automatic transmission is fitted, the information is supplied over the CAN by the ETC control unit.
Motor electronics control unit, location/task/
design/functionother than engine 111 EVOGF07.61-P-
5000F
Engine 111 EVOGF07.61-P-
5000GS
Pedal value sensor, location/task/design/ function GF30.20-P-
4011L
Electronic accelerator/cruise control/idle speed GF30.22-P-

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY CAB Throttle Control, Speed Control Systems - 163 Chassis
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ELECTRONIC ACCELERATOR PEDAL EMERGENCY RUNNING MODE FUNCTION - GF30.20-P-4026E
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,
111.946 as of 1.6.98,
111.944/975 as of 1.8.96,
111.943 /947 /951 /952 /955 /956 /957 /958 /973 /982 /983
ENGINE 111.945
in MODEL 202.020 /080 as of 1.9.98,
208.335/435 as of 1.6.98
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 /9
5
control actuator location/task/design/function4010F
Throttle valve actuator, location/task/design/
functionEngine 111 EVOGF30.22-P-
4101GS
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

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY CAB Throttle Control, Speed Control Systems - 163 Chassis
me
Saturday, October 02, 2010 3:36:27 PMPage 13 © 2006 Mitchell Repair Information Company, LLC.

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
To allow safe further driving depending on the fault which has arisen in the electronic accelerator pedal system.
Pedal value sensor emergency mode
If the sensor in the pedal value sensor (B37) fails, the system will switch over to the second sensor. The throttle
valve opening is limited to approx. 60%. There is also dynamic limitation of the throttle valve's opening speed
where the throttle valve opening is delayed (the indicator lamp EPC does not light up).
If the plausibility check delivers a negative result or both sensors are defect only the idling speed will be
regulated (the indicator lamp EPC lights up).
Actuator for the throttle valve - emergency running, electrical
If a potentiometer in the actuator for the throttle valve breaks down the system switches-over to the second
intact potentiometer. The air flow mass serves as a second parameter for comparative purposes. Following a
plausibility check, the throttle valve opening is limited to approx. 60% in line with engine speed and load (EPC
indicator lamp does not come on).
If the plausibility check is negative or if both potentiometers are faulty, the throttle valve adopts a mechanical
emergency running position which is fixed by the spring capsule in the actuator (EPC indicator lamp comes on).
Actuator for the throttle valve - emergency running, mechanical emergency running stop
If the actuator motor is defect or there are other faults present the power supply to the actuator will be shut off.
The throttle valve then lies on the mechanical stop (spring box) so the throttle valve opening remains at a
constant 10-12°. At no engine load (idling) engine speed is regulated to about 900 rpm by shutting off or
activating the cylinders at the fuel side.
When driving, engine speed is controlled, in line with the engine load, by switching the cylinders off and on at
the fuel side. The maximum engine speed is about 1800 rpm. which is limited by the mechanical stop (the
indicator lamp EPC lights up).
Safety fuel shutoff
If a mechanical fault exists in the actuator, the safety fuel shutoff is activated.
Here the fuel injection valves are shut off for engine speeds < 1400 rpm and actuated again at speeds < 1200
rpm (the indicator lamp EPC li
ghts up).

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY CAB Throttle Control, Speed Control Systems - 163 Chassis
me
Saturday, October 02, 2010 3:36:27 PMPage 14 © 2006 Mitchell Repair Information Company, LLC.

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/functionother than engine 111 EVOGF30.22-P-
4010F
Throttle valve actuator, location/task/design/ functionEngine 111 EVOGF30.22-P-
4101GS
Electronic power control indicator lamp,
location/task/design/functionEngine 119.98, 120.98 in
Model 129, 140 up to 5/96GF30.20-P-
4012L
Motor electronics control unit, location/task/
design/functionother than engine 111 EVOGF07.61-P-
5000F
Engine 111 EVOGF07.61-P-
5000GS

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY CAB Throttle Control, Speed Control Systems - 163 Chassis
me
Saturday, October 02, 2010 3:36:27 PMPage 15 © 2006 Mitchell Repair Information Company, LLC.

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 /9
5
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
Controllin
g 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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Saturday, October 02, 2010 3:36:27 PMPage 16 © 2006 Mitchell Repair Information Company, LLC.

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 o
f
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 o
f
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 conditionin
g 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
Saturday, October 02, 2010 3:36:27 PMPage 17 © 2006 Mitchell Repair Information Company, LLC.

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 functionEngine 137GF15.15-P-
3000L
Pedal value sensor, location/task/design/ function GF30.20-P-
4011L
Coolant temperature sensor, location/task/
design/function
Engine 119, 120GF07.04-P-
5026F
Engine 104, 111GF07.04-P-
5026G
Engine 112, 113, 137GF07.04-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, 210GF07.61-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 functionEngine 120.98GF30.20-P-
4026F
Engine 104, 111, 112, 113, 119, 137GF30.20-P-
4026E

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY CAB Throttle Control, Speed Control Systems - 163 Chassis
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Saturday, October 02, 2010 3:36:27 PMPage 18 © 2006 Mitchell Repair Information Company, LLC.

ELECTRONIC ACCELERATOR/CRUISE CONTROL/IDLE SPEED CONTROL ACTUATOR POSITION - GF30.22-P-4010-
01A
Fig. 11: Identifying Throttle Valve Actuator
ELECTRONIC ACCELERATOR/CRUISE CONTROL/IDLE SPEED CONTROL ACTUATOR DESIGN - GF30.22-P-4010-02F
Illustration shows actuator M16/4 (further designations: M16/1, M16/3, M16/6 throttle valve actuator)
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/functionwith MTGF29.10-P-
2100F
SBC control unit, location/task/functionModel 211, 230: Request for increased
idle speedGF42.46-P-
4500SL

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY CAB Throttle Control, Speed Control Systems - 163 Chassis
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Saturday, October 02, 2010 3:36:27 PMPage 19 © 2006 Mitchell Repair Information Company, LLC.

Fig. 12: Identifying Electronic Accelerator/Cruise Control/Idle Speed Control Actuator Components
Each actuator contains two actual value potentiometers for detecting the position of the throttle valve. The
second potentiometer is used as a reference value to the plausibility check. In addition, the system switches over
to the second potentiometer if the first potentiometer fails.
ELECTRONIC ACCELERATOR/CRUISE CONTROL/IDLE SPEED CONTROL ACTUATOR FUNCTION - GF30.22-P-4010-
03F
Illustration shows actuator M16/4

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY CAB Throttle Control, Speed Control Systems - 163 Chassis
me
Saturday, October 02, 2010 3:36:27 PMPage 20 © 2006 Mitchell Repair Information Company, LLC.