1997 MERCEDES-BENZ ML320 engine

module.
Z50/31In dash harness, in E-box.
Z50/32In dash harness, near breakout for center nozzle air
stream temperature sensor.
Z50/33In dash harness, in breakout to combination switch.
Z50/34In dash harness, behind instrument cluster, between
breakouts to parking brake switch & stoplight
switch.
Z51/1In passenger harness, in breakout to dash connector
X18.
Z51/2In passenger harness, in breakout to dash connector
X18.
Z51/3In passenger harness, in E-box.
Z51/4In passenger harness, in E-box.
Z51/5In passenger harness, near breakout for radio & SRS
control module.
Z51/6In passenger harness, in breakout to electronic
selector lever module control module.
Z51/7In passenger harness, in breakout to electronic
selector lever module control module.
Z51/8In passenger harness, under right side of dash.
Z51/9In passenger harness, near breakout to W18.
Z51/11In passenger harness, near breakout to radio & SRS
control module.
Z51/12In passenger harness, in breakout to radio.
Z51/13In passenger harness in engine compartment, in
breakout to engine control module connector C4.
Z51/14In passenger harness, in E-box.
Z51/15In passenger harness, near breakout to radio.
Z51/16In passenger harness, in breakout to X18.
Z52/1In passenger harness, near breakout to trailer
connector X52.
Z52/4In passenger harness, in main harness breakout for
left side of vehicle.
Z52/5In passenger harness, near breakout to tailgate
harness.
Z52/6In passenger harness, near breakout to tailgate
harness.
Z52/8In passenger harness, in main harness breakout for
left side of vehicle.
Z52/9In passenger harness, in main harness breakout for
right side of vehicle.
Z52/10In passenger harness, in breakout to dash connector

2001 Mercedes-Benz ML320
2001 MERCEDES-BENZ ML320 & ML430
me
Saturday, October 02, 2010 3:21:17 PMPage 10 © 2006 Mitchell Repair Information Company, LLC.

COMPONENT LOCATION GRAPHICS
Z54/10In headliner harness, in breakout for W7.
Z55/1In tailgate harness, near breakout to tailgate CL
actuating motor, rear wiper motor & license plate
lights.
Z56/1Behind left headlight.
Z56/2Behind left headlight.
Z56/4Behind left headlight.
Z56/5Behind left headlight.
Z56/6Behind left headlight.
Z56/7In breakout to fanfare horns.
Z57/1Behind right headlight.
Z57/2In E-box.
Z57/3In right engine harness, near breakout to wiper
motor.
Z57/7In E-box.
Z58/1In trailer harness.
Z58/8In trailer harness.
Z59/1In door mounted spare tire harness.
Z59/2In door mounted spare tire harness.
Z59/3In left/right door harness.
Z59/4In left/right rear door harness.
Z60/4In foglight harness.
Z60/5In foglight harness.
Z61In dash harness, near breakout to parking brake
switch.
Z61/5Under center console, near breakout for lower
control field control module connector C3.
Z61/6Under center console, near breakout for lower
control field control module connector C3.
Z87/17Behind radio.
Z87/18Behind radio.
Z99/6In motor harness, in E-box.
Z99/7In motor harness, in E-box.
NOTE: Figures may show multiple component locations. Refer to appropriate table for
proper figure references.

2001 Mercedes-Benz ML320
2001 MERCEDES-BENZ ML320 & ML430
me
Saturday, October 02, 2010 3:21:17 PMPage 12 © 2006 Mitchell Repair Information Company, LLC.

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
distributionENGINE 112, 113...AH15.10-P-1002-
01WA
General notes on
contactless high voltage
distributionENGINE 104, 111...AH15.10-P-1002-
01WD
General notes on
contactless high voltage
distributionENGINE 119, 120...AH15.10-P-1002-
01WE
General notes on testing
contactless high voltage
distributionENGINE 104, 111, 112, 113,
119, 120...AH15.10-P-1003-01W
Notes on ignition coil
characteristics of ignition
systemsENGINE 104, 111, 112, 113,
119, 120...AH15.10-P-1001-01A
Notes on avoiding
damage to ignition systemENGINE
266.920 /940 /960 /980 in
MODEL 169.0/3,245.2AH15.10-P-0002-
01AK
Notes on avoiding
damage to the ignition
systemENGINE 111 mit Benzin-
Einspritz-und Zundsystem
PMSAH15.10-P-0002-01B
Notes on avoiding
damage to the ignition
systemENGINE 104, 111 mit Benzin-
Einspritz-und Zundsystem
HFMAH15.10-P-0002-01C
Notes on avoiding
damage to the ignition
systemENGINE 103, 104, 119 mit
Benzin-Einspritzanlage KEAH15.10-P-0002-01E
Notes on avoiding
damage to the ignition
systemENGINE 104, 119, 120 mit
Benzin-Einspritzanlage LHAH15.10-P-0002-01F
Notes on avoiding
damage to the ignition
systemENGINE 166 mit Benzin-
Einspritz- und Zundsystem
MSMAH15.10-P-0002-01G
Information on avoiding
damage to ignition systemENGINE 137, 275, 285AH15.10-P-0002-01L
Notes on avoiding ENGINE 272, 273AH15.10-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
Saturday, October 02, 2010 3:18:54 PMPage 1 © 2006 Mitchell Repair Information Company, LLC.
me
Saturday, October 02, 2010 3:18:57 PMPage 1 © 2006 Mitchell Repair Information Company, LLC.

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 facilit
y 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 systemENGINE 104, 111, 112, 113,
119, 120, 156, 271, 112 mit
Benzin-Einspritz- und
Zundsystem MEAH15.10-P-0002-01D
Notes for ceramic glow
plugsENGINE 646.8, 642AH15.20-P-0001-01A

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 2 © 2006 Mitchell Repair Information Company, LLC.

possible to test the primary ignition circuit with adapter cable A.
Ignition coil characteristics of ignition systems
EngineModelHFM-SFIME-SFIPECTwin-spark
i
gnition coil
without kV
pickup
Twin-spark
i
gnition coil
with kV
pickup
Single-
spark
i
gnition coil
with kV
pickup
104129 up to 05/96X X
104129 as of 06/96 2.1 X
104140 up to 05/96X X
104140 as of 06/96 2.1 X
104202 up to 07/96X X
104202 as of 08/96 2.1 X
104210X X
104210 up
to 05/96X X
104210 as
of 06/96 2.1 X
111163X X
111170.435X X
111170.445 2.1 X
111170.447 2.1 X
111202.018/020 up
to 07/96 XX
111202.018/020 as
of 08/96X X
111202.025 up to
07/96X X
111202.025 as of
08/96 2.1 X
111202.022 up to
07/96X X
111202.023 as of
08/96X X
111202.023 as of
08/96 2.1 X
111202.024 up to
07/96X X
111202.024 as of
08/96 2.1 X
111210 up to 05/96X X
111210 as of 06/96X X

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 3 © 2006 Mitchell Repair Information Company, LLC.

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
i
gnition voltage curve can be plotted with a primary adapter cable (D).
112163 2.0 X
112202 2.0 X
112208 2.0 X
112210 2.0 X
112220 2.0 X
113163 2.0 X
113202 2.0 X
113208 2.0 X
113210 2.0 X
113220 2.0 X
119.982129 1.0 X
119.980140 1.0 X
119.981140 1.0 X
119210 1.0 X
120.983129 1.0 X
120.982140 1.0 X

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 4 © 2006 Mitchell Repair Information Company, LLC.

Fig. 1: Identifying Connection Cables Of Double Ignition Coil
Diagnosis with engine tester:
Connect green connector (terminal 1) of engine tester alternatively to the yellow socket or green socket for
assessing an ignition circuit with the primary adapter cable.
Connect yellow connector (terminal 15) of engine tester to positive (tml. 30 /tml. 15).
GENERAL NOTES ON TESTING CONTACTLESS HIGH VOLTAGE DISTRIBUTION - AH15.10-P-1003-01W

If a complaint exists in the start or warming-up phase, do not condition engine to operating temperature but
proceed on a complaint-related basis.
Connections: set diagnostic tester to cylinder number 1 primary or secondary (if possible) and test through the
ignition circuits one after the other.
Diagnosis test oscilloscope / good image contactless high voltage distribution Secondary side (single
image) Engine idling
(shown on engine M119.981, cylinder 1 with Bosch ignition coil)
Measurin
g range: 40 kV

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 5 © 2006 Mitchell Repair Information Company, LLC.

Time range: 5 ms
Fig. 2: Diagnosis Test Oscilloscope / Good Image Contactless High Voltage Distribution Secondary Side
(Single Image) Engine Idling
Diagnosis test oscilloscope / good image contactless high voltage distribution Primary side (single image)
Engine idling

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 6 © 2006 Mitchell Repair Information Company, LLC.