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Mercedes-Benz ML320. Service manual - part 805

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 /95

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

Pedal value sensor function

actuation 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

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/function

other than engine 111 EVO

GF07.61-P-
5000F

Engine 111 EVO

GF07.61-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

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 /95

control actuator location/task/design/function

4010F

Throttle valve actuator, location/task/design/
function

Engine 111 EVO

GF30.22-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

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 lights up).

2001 Mercedes-Benz ML320

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

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