Mercedes-Benz ML320. Manual — part 387

Fig. 16: Identifying Knock Sensors - Engine 112

KNOCK SENSORS, LOCATION - GF15.12-P-4101-01B

Fig. 17: Identifying Knock Sensors - Engine 113

KNOCK SENSORS, FUNCTION - GF15.12-P-4101-02KE

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

Fig. 18: Identifying Knock Sensors Oscilloscope Signals

Any vibrations which occur are converted with the aid of the piezo ceramic into electrical signals.

Piezo-electric effect: If a mechanical force acts on a crystal, electrical voltages are produced.

Knock sensor signals may also indicate engine damage, e.g. increased engine noise resulting from a widened
piston groove.

KNOCK SENSORS, LOCATION/TASK/DESIGN/FUNCTION - GF15.12-P-4101F

ENGINE 104.941 /942 /943 /944 /945 /991 /992 /994 /995

ENGINE 111.921 /943 /944 /945 /946 /947 /960 /961 /970 /973 /974 /975 /977

ENGINE 111.942 as of 1.6.96

ENGINE 111.951 /952 /955 /956 /957 /958 /982 /983

ENGINE 119.980 /981 /982 /985

ENGINE 120.982/983

ENGINE

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

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 166.940 /960 /990 /995

Fig. 19: Identifying Knock Sensors

STARTER CONTROL, FUNCTION - GF15.30-P-3000GA

ENGINE 111.921 /942 as of 1.9.98,

111.943 /944 /946 /947 /973 with CODE (423a) 5-speed automatic transmission (new-generation)

ENGINE 111.945

in MODEL 208.335 /435 as of 1.6.98,

Knock sensors, location

Engine 104

GF15.12-P-4101-01D

Engine 111

GF15.12-P-4101-01G

Engine 112

GF15.12-P-4101-01A

Engine 113

GF15.12-P-4101-01B

Engine 119

GF15.12-P-4101-01E

Engine 120

GF15.12-P-4101-01F

Engine 166

GF15.12-P-4101-01GC

Knock sensors, task

The knock sensor detects
vibrations at the crankcase.

Knock sensors, design

The knock sensor is a self-
contained system. Inside
the sensor are piezo
crystals. The screened
cable is fitted directly onto
the knock sensor.

Knock sensors, function

GF15.12-P-4101-02KE

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

202.020 /080 as of 1.9.98 with CODE (423a) 5-speed automatic transmission (new-generation)

ENGINE 111.974

with CODE (423a) 5-speed automatic transmission (new-generation)

with CODE (494a) USA version

with CODE (807) Model year 1997

with CODE (808) Model year 1998

ENGINE 111.975 as of 1.8.96 with CODE (423a) 5-speed automatic transmission (new-generation)

ENGINE
112.910 /911 /912 /913 /914 /916 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /946 /947 /949 /953 /954 /95
with CODE (423a) 5-speed automatic transmission (new-generation)

ENGINE 113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969 with CODE (423a) 5-speed
automatic transmission (new-generation)

ENGINE 120.983 as of 1.6.98

ENGINE 137.970

Fig. 20: Identifying Starter Function Components - Shown On Engine 111

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me