Mercedes-Benz ML320. Manual — part 381

1998-2005 ENGINE

Electrical System - Engine - 163 Chassis

GENERAL INFORMATION

GENERAL NOTES: PASSENGER CARS: ELECTRICAL SYSTEM - ENGINE - AH15.00-Z-9999AZ

MODEL all

General notes on
contactless high voltage
distribution

ENGINE 112, 113...

AH15.10-P-1002-
01WA

General notes on
contactless high voltage
distribution

ENGINE 104, 111...

AH15.10-P-1002-
01WD

General notes on
contactless high voltage
distribution

ENGINE 119, 120...

AH15.10-P-1002-
01WE

General notes on testing
contactless high voltage
distribution

ENGINE 104, 111, 112, 113,
119, 120...

AH15.10-P-1003-01W

Notes on ignition coil
characteristics of ignition
systems

ENGINE 104, 111, 112, 113,
119, 120...

AH15.10-P-1001-01A

Notes on avoiding
damage to ignition system

ENGINE
266.920 /940 /960 /980 in
MODEL 169.0/3,245.2

AH15.10-P-0002-
01AK

Notes on avoiding
damage to the ignition
system

ENGINE 111 mit Benzin-
Einspritz-und Zundsystem
PMS

AH15.10-P-0002-01B

Notes on avoiding
damage to the ignition
system

ENGINE 104, 111 mit Benzin-
Einspritz-und Zundsystem
HFM

AH15.10-P-0002-01C

Notes on avoiding
damage to the ignition
system

ENGINE 103, 104, 119 mit
Benzin-Einspritzanlage KE

AH15.10-P-0002-01E

Notes on avoiding
damage to the ignition
system

ENGINE 104, 119, 120 mit
Benzin-Einspritzanlage LH

AH15.10-P-0002-01F

Notes on avoiding
damage to the ignition
system

ENGINE 166 mit Benzin-
Einspritz- und Zundsystem
MSM

AH15.10-P-0002-01G

Information on avoiding
damage to ignition system

ENGINE 137, 275, 285

AH15.10-P-0002-01L

Notes on avoiding

ENGINE 272, 273

AH15.10-P-0002-01V

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

me

NOTES ON AVOIDING DAMAGE TO IGNITION SYSTEM - AH15.10-P-0002-01D

Engine 104, 111, 112, 113, 119, 120, 156, 271



To avoid damage to control unit connect and disconnect the two connectors on control unit only when
ignition is switched off.



Terminal 1 of ignition coils must not be short-circuited to GND, e.g. as anti-theft protection.



Install only original ignition system components.



Do not operate ignition system at starting speed unless all of the ignition cables are connected.



No tests such as holding ignition cable 4 at a distance to GND, unplugging a spark plug connector or
pulling cable 4 out of the ignition coils, may be performed at starting speed or when the engine is
running.



Every high voltage circuit must be loaded with at least 2 kohms (spark plug connector).



If it is necessary to test the ignition spark when providing roadside assistance, this must only be done with
a spark plug at a cylinder ignition cable. Ensure that the spark plug has good contact to ground.



Before working at cranking speed, e.g. checking compression pressure, switch off ignition and disconnect
connector "2" from control unit.

Engine 120 has two fuel injection and ignition systems.

Use of testers



Only connect and disconnect secondary measuring sensor to corresponding ignition cables when vertical
engine and ignition are switched off.



If the shot-circuit protection is operated (cylinder comparison) and the engine stays upright, it is not
possible to conduct the test with this test instrument.



Do not connect test lamp to ignition coil terminals 1 and 15.

NOTES ON IGNITION COIL CHARACTERISTICS OF IGNITION SYSTEMS - AH15.10-P-1001-01A

Engine 104, 111, 112, 113, 119, 120

In the case of the twin-spark ignition coil with kV pickup in ignition systems ME-SFI 2.1 and HFM-SFI, no
measurement facility exists at the ignition coil using the kV pickup although a kV pickup is fitted. It is only

damage to ignition system

Notes on avoiding
damage to ignition system

ENGINE 104, 111, 112, 113,
119, 120, 156, 271, 112 mit
Benzin-Einspritz- und
Zundsystem ME

AH15.10-P-0002-01D

Notes for ceramic glow
plugs

ENGINE 646.8, 642

AH15.20-P-0001-01A

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

possible to test the primary ignition circuit with adapter cable A.

Ignition coil characteristics of ignition systems

Engine

Model

HFM-SFI

ME-SFI

PEC

Twin-spark
ignition coil

without kV

pickup

Twin-spark
ignition coil

with kV

pickup

Single-

spark

ignition coil

with kV

pickup

104

129 up to 05/96

X

X

104

129 as of 06/96

2.1

X

104

140 up to 05/96

X

X

104

140 as of 06/96

2.1

X

104

202 up to 07/96

X

X

104

202 as of 08/96

2.1

X

104

210

X

X

104

210

up

to 05/96

X

X

104

210

as

of 06/96

2.1

X

111

163

X

X

111

170.435

X

X

111

170.445

2.1

X

111

170.447

2.1

X

111

202.018/020 up
to 07/96

X

X

111

202.018/020 as
of 08/96

X

X

111

202.025 up to
07/96

X

X

111

202.025 as of
08/96

2.1

X

111

202.022 up to
07/96

X

X

111

202.023 as of
08/96

X

X

111

202.023 as of
08/96

2.1

X

111

202.024 up to
07/96

X

X

111

202.024 as of
08/96

2.1

X

111

210 up to 05/96

X

X

111

210 as of 06/96

X

X

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

GENERAL NOTES ON CONTACTLESS HIGH VOLTAGE DISTRIBUTION - AH15.10-P-1002-01WA

Engine 112, 113 with ME-SFI fuel injection and ignition system

The ignition system can be tested at the primary side and secondary side. It is only possible to test ignition
circuit a and ignition circuit b one after the other.

The ignition coils are fitted as standard with cast mounts for the secondary adapters (kV pickup C). The primary
ignition voltage curve can be plotted with a primary adapter cable (D).

112

163

2.0

X

112

202

2.0

X

112

208

2.0

X

112

210

2.0

X

112

220

2.0

X

113

163

2.0

X

113

202

2.0

X

113

208

2.0

X

113

210

2.0

X

113

220

2.0

X

119.982

129

1.0

X

119.980

140

1.0

X

119.981

140

1.0

X

119

210

1.0

X

120.983

129

1.0

X

120.982

140

1.0

X

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me