1997 MERCEDES-BENZ ML320 Complete Repair Manual

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MERCEDES-BENZ ML320 1997 Complete Repair Manual
2001 Mercedes-Benz ML320
2001 MERCEDES-BENZ ML320 & ML430
me
Saturday, October 02, 2010 3:21:17 PMPage 13 © 2006 Mitchell Repair Information Company, LLC.

Page 2154 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Fig. 1: Plan View Of Vehicle
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2001 Mercedes-Benz ML320
2001 MERCEDES-BENZ ML320 & ML430
me
Saturday, October 02, 2010 3:21:17 PMPage 14 © 2006 Mitch

Page 2155 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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

Page 2156 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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 contro

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.

Page 2157 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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-sp

Page 2158 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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

Page 2159 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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

Page 2160 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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 contactl

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