Mercedes-Benz ML320. Manual — part 398

Fig. 41: Generator Connection Diagram - Model 202

Fig. 42: Generator Connection Diagram - Model 208

Model 210: as of 1.6.99 a fuse for protection of generator is located in the terminal block circuit 30 (X12/3).

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

Fig. 43: Generator Connection Diagram - Model 210

1. Connect DC clip-on probe (065) from engine tester with oscilloscope (030) to positive pole of battery

(G1)

2. Start engine.

3. Switch on low beam.

4. Assess diode harmonics at 3000 rpm (engine speed).

In this test it is not possible to assess the exciter diodes.

Fig. 44: Identifying Harmonics - Negative Diode Defective

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

Fig. 45: Identifying Harmonics - Positive Diode Defective

Fig. 46: Identifying Diode Harmonics OK

REPLACE SPARK PLUGS - AP15.10-P-1580GH

ENGINE 112.942 in MODEL 163.154

ENGINE 112.970 in MODEL 163.157

ENGINE 113.942 in MODEL 163.172

ENGINE 113.981 in MODEL 163.174

ENGINE 113.965 in MODEL 163.175

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

Fig. 47: Identifying Spark Plugs And Cylinder 4 Ignition Coil

Remove/install and
replacing

Risk of death due to
contact with high-voltage
conductive parts

Do not touch parts which
conduct high voltages.
Persons who are carriers
of electronic implants
(e.g. cardiac pacemaker)
may not carry out any
work on the ignition
system

AS15.10-Z-0001-01A

Notes on avoiding damage
to ignition system

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

AH15.10-P-0002-01D

1

Remove/install air filter
upper section

2

Remove ignition coils
Remove/install ignition
coils

AR15.12-P-2003A

3

Disconnect spark plug
connectors

Prise over cylinder

head cover.

Double open-ended

wrench

Fig. 24

Checking

4

Check spark plug

Replace, if necessary.

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me