Mercedes-Benz ML320. Service manual - part 773

 

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Mercedes-Benz ML320. Service manual - part 773

 

 

GF18.40-P-4111-02A

Oil sensor function

n

 

P18.40-2046-12

B40 Oil sensor (oil level, temperature and quality)

2

Temperature sensor (PT1000)

A

Capacitive measuring range

C1

Top condenser
CL Capacitive air
COIL

Capacitive engine oil

C2

Bottom condenser

h

Fill level

Oil level and oil quality are detected on the basis of the capacitance 
of the engine oil (dielectric). The oil temperature is detected by the 
temperature sensor. All the signals are processed in the electronics 
to form a PWM signal and transferred to the engine control unit.

The measuring principle of the oil sensor is a capacitance 
measurement, whereby the capacitance is dependent upon the oil 
level. The measuring system consists of two cylinder condensers 
which possess a metal pipe as a common external electrode. Both 
other electrodes are arranged over each other as an inner pipe. 
The dielectric constant of the engine oil is determined by the lower 
condenser (C2) which is always full of oil (e approximately 2.3 to 4.0).

The fill level (h) is then determined by the upper condenser (C1) 
using the dielectric constant. The capacitance of the upper 
condenser (C1) is calculated on the basis of a parallel connection 
with two condensers which have air and engine oil as a dielectric 
material.

The condensers are located in a plastic housing which serves as a 
damping cup. The engine oil flows through the feed bore holes into 
the housing between the condensers.

The measuring range for the oil level is 80 mm
(normal level 

F

40 mm), accuracy of measurement approx. 

F

3 mm.

The voltage for the oil sensor (approx. 5 V) is supplied by the engine 
control unit.

P07.61-0445-05

Signal assignment oil sensor

1

On/off ratio signals

Okay

A

Oil temperature

20 to 80%

B

Oil level

20 to 80%

C

Oil quality

20 to 80%

2

On/off ratio signals

>80 %

A

Oil temperature

> +160 °C

B

Oil level

>80 mm

C

Oil quality

e>6

3

On/off ratio signals

<20 %

A

Oil temperature

< - 40 °C

B

Oil level

<0 mm

C

Oil quality

e< 1

T

pulse duty factor

100 %

Each information block consists of three successive square-wave 
signals, This is followed by a short pause.
A measured variable is assigned to each square-wave signal (A, B, 
C). The quantisizing in each case is based on the on/off ratio (T) of 
approx. 20 to 80 %.

Because oil level and oil quality (capacitance of the engine oil) are 
dependent of each other, this information is first compensated for in 
the engine control unit, before it is transmitted via CAN databus to 
instrument cluster.

The following faults at the oil sensor are detected by the engine 
control unit and entered in the fault memory:
- Duty cycle of a signal less than 17 % or more than 83 %
- Dielectric constant of engine oil longer than 100 seconds greater 
than 5.8 (e.g. because of a lot of water in the engine oil).

Copyright DaimlerChrysler AG  05.06.2006 CD-Ausgabe G/10/04 . This WIS print-out will not be recorded by Modification services.

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GF18.40-P-4111A

Oil sensor, location/task/design/function

15.10.96

ENGINE 

111.951 /955 /956 /957 /982

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 

166.940 /960 /990 /995

P18.40-2104-11

Shown on engine 112, 113 in Model 129, 163, 170, 202, 208, 210, 
215, 220
1

Electronics with 3-pin plug connection

B40

Oil sensor (oil level, temperature and quality)

A

Capacitive measuring range at sensor

C

Plug connection
Pin 1: output signal
Pin 2: GND
Pin 3: voltage supply

Oil sensor position

Motor 111.951/ 955

GF18.40-P-4111-01GS

M112113 in Model 129, 163, 170, 202, 208, 
210, 215, 220 and model 203, 211with 4MATIC

GF18.40-P-4111-01A

M112, 113 in Model 203, 211 without 4MATIC 
and model 209

GF18.40-P-4111-01AA

M166

GF18.40-P-4111-01GC

Oil sensor task

Detecting oil level, oil temperature, oil quality

Oil sensor design

The oil sensor consists of:

D Electronics with 3-pin connector

D Capacitive measuring elements 

(condensers)

D Temperature sensor.

Oil sensor function

GF18.40-P-4111-02A

Copyright DaimlerChrysler AG  05.06.2006 CD-Ausgabe G/10/04 . This WIS print-out will not be recorded by Modification services.

Page 1

GF18.40-P-4111-01A

Oil sensor position

n

 

P18.40-0247-06

Location of oil sensor, engine 112, 113 in 
model 129, 163, 170, 202, 208, 210, 215, 220
Model 203 with 4MATIC
Model 211 with 4MATIC

B40

Oil sensor (oil level, temperature 
and quality)

Copyright DaimlerChrysler AG  05.06.2006 CD-Ausgabe G/10/04 . This WIS print-out will not be recorded by Modification services.

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BB00.40-P-0229-03A

Multigrade engine oils (Sheet 229.3)

 For use in vehicles/engines refer to 

#

Sheet 229.3

Sheet 223.2

BB00.40-P-0223-02A

For specified viscosity grades refer to 

#

Sheet 224.1 (passenger-car engines)

BB00.40-P-0224-01A

Sheet 224.2 (commercial-vehicle 
engines)

BB00.40-P-0224-02A

Product name

0W-30

0W-40

5W-30

5W-40

5W-50

Company, town, country

76 Pure Synthetic Motor Oil

X

ConocoPhillips, Costa Mesa, CA, USA

Addinol Extra light MV 038

X

Addinol Lube Oil GmbH, Leuna, Germany

Addinol Super light MV 0546

X

Addinol Lube Oil GmbH, Leuna, Germany

Addinol Super power MV 0537

X

Addinol Lube Oil GmbH, Leuna, Germany

Agip Eurosport

X

ENI S.p.A. - Refining & Marketing Division, Rome, Italy

Agip Extra HTS

X

ENI S.p.A. - Refining & Marketing Division, Rome, Italy

Agip Sint 2000 Evolution

X

X

ENI S.p.A. - Refining & Marketing Division, Rome, Italy

Agip Sint Turbodiesel Evolution

X

ENI S.p.A. - Refining & Marketing Division, Rome, Italy

Agip Synthetic PC

X

ENI S.p.A. - Refining & Marketing Division, Rome, Italy

Agip Tecsint SL

X

ENI S.p.A. - Refining & Marketing Division, Rome, Italy

Agip Tecsint SX

X

ENI S.p.A. - Refining & Marketing Division, Rome, Italy

Alpine topsynth

X

Mitan Mineralöl GmbH, Ankum, Germany

Antar Excellia LDX 5W40

X

Total Lubrifiants, Paris, France

AP Supreme Premium 9999 Synthetic

X

AP Oil International Ltd, Singapore, Singapore

Aral HighTronic

X

Aral Aktiengesellschaft, Hamburg, Germany

Aral SuperSynth

X

Aral Aktiengesellschaft, Hamburg, Germany

Aral SuperTronic

X

Aral Aktiengesellschaft, Hamburg, Germany

Aral SuperTronic G

X

Aral Aktiengesellschaft, Hamburg, Germany

Autol Carrera

X

Agip Schmiertechnik GmbH, Würzburg, Germany

Aviasynth

X

Avia Mineralöl-AG, Munich, Germany

Azmol Leader

X

Aot Azmol, Berdyansk, Ukraine

Blasol PSP 5W40

X

Blaser Swisslube AG, Hasle-Rüegsau, Switzerland

BP Euro Plus

X

BP p.I.c., London, England

BP Visco 5000

X

BP p.I.c., London, England

BP Visco 5000 Turbo Diesel

X

BP p.I.c., London, England

BP Visco 7000 GM

X

BP p.I.c., London, England

BP Visco 7000 Long Life

X

BP p.I.c., London, England

BP Visco 7000 Special

X

BP p.I.c., London, England

BP Visco 7000 Sport

X

BP p.I.c., London, England

Carl Motorenöl Power

X

Coparts Autoteile GmbH, Essen, Germany

Castrol Formula RS Motorsport 0W-40

X

Castrol Ltd., Swindon, England

Castrol Formula RS Road and Track

X

Castrol Ltd., Swindon, England

Castrol Formula SLX

X

Castrol Ltd., Swindon, England

Castrol Formula SLX LongTec

X

Castrol Ltd., Swindon, England

Castrol Formula SLX Turbo Diesel

X

Castrol Ltd., Swindon, England

Castrol GTX 7 Dynatec

X

Castrol Ltd., Swindon, England

Castrol Performance

X

Castrol Ltd., Swindon, England

Castrol Syntec 0W-30

X

Castrol Ltd., Swindon, England

Castrol Syntec 5W-40

X

Castrol Ltd., Swindon, England

Castrol TXT E.D.I. tec

X

Castrol Ltd., Swindon, England

Castrol TXT Softec

X

Castrol Ltd., Swindon, England

Castrol TXT Softec Plus

X

Castrol Ltd., Swindon, England

Cepsa Star Mega Synthetic

X

Cepsa Lubricantes, S.A., Madrid, Spain

Cepsa Star Mega Synthetic 0W-30

X

Cepsa Lubricantes, S.A., Madrid, Spain

CONCEP-TECH VS

X

Swd Lubricants GmbH & CO. KG, Duisburg, Germany

Consol Ultima

X

Vial Oil Ltd., Moscow, Russia

Cosmo Lio Royal

X

Cosmo Oil Lubricants Co., Ltd, Tokyo, Japan

CPC 9000 MB Motor Oil

X

Chinese Petroleum Corporation, Chia-Yi, Taiwan

DEA Ultec SYN-T

X

Shell & DEA Oil GmbH, Hamburg, Germany

Duckhams Q 5W40 Fully Synthetic

X

BP p.I.c., London, England

Copyright DaimlerChrysler AG  20.05.2006 CD-Ausgabe G/10/04 . This WIS print-out will not be recorded by Modification services.

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