Star Bulletin

Mercedes-Benz
The best or nothing.

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Date:
Order No.:
Group:
SUBJECT:

December 9, 2014
S-B-15.40/73
15

MY-All, Engine 111 in Model 124, 163, 170, 202, 203, 208, 210
Engine 112 in Model 129, 163, 170, 202, 203, 208, 209, 210, 211, 220, 230
Engine 113 in Model 129, 163, 164, 171, 202, 203, 208, 209, 210, 211, 215, 219,
220,230,251
Engine 137 in Model 215, 220
Engine 271 in Models 171, 203, 209, 211
Engine 272 in Model 164, 171, 203, 209, 211, 219, 221, 230, 251
Engine 273 in Model 164, 209, 211, 219, 221, 230, 251
Engine 275 in Model 215, 220, 221, 230
Engine 642 in Model 164, 203, 209, 211, 219, 221, 251
Engine 648 in Model 211, 220
Engine 155 in Model 199
Engine 285 in Model 240
Alternator Diagnosis

For some time our vehicles/engines have been equipped with alternators which communicate with
the ME or COi engine control via an interface.
This results in changes to the system diagnosis and when testing the alternator a distinction is
made between the conventional alternator with terminal 61 without interface and alternators with
BSS interface or LIN interface.
"CONVENTIONAL" alternator not linked to the engine control unit (MSG)
•

No form of communication between the alternator and engine control unit

•

Engine control unit cannot assist during the alternator test

•

Testing not possible with DAS- only with external technology (Volt-Ampere-Tester)

"BSS" alternator linked to the engine control unit per BSS
•

BSS = Bit Synchrone Schnittstelle (bit synchronous interface), communication ECU
alternator

•

Testing possible via engine control unit - Diagnosis Assistance System

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MBUSA-SLP S424HH001. Control of Quality Records.

© 2014 Mercedes-Benz USA, LLC.
Mercedes-Benz Canada, Inc.

Dealer Workshop Services
www.MBUSA.com
www.startekinfo.com

r1

All rights reserved. Reproduction or translation in whole
or in part is not penTlitted without authorization from the
publisher. Printed in U.S.A.
1-800-FOR-MERCedes

"LIN" alternator linked to the engine control unit per LIN
•

LIN = Local Interconnect Network, communication engine control unit Diagnosis
Assistance System possible

•

Testing possible via engine control unit- Diagnosis Assistance System

In addition to the above-mentioned information, WIS release 06/2006 also contains a function
description concerning the topic, "Power supply for on-board electrical system".

NOTE:

With "conventional" alternators, it is important to note that the full charging current is not
generated immediately after the engine is started. The full charging current is only
generated after a load response delay. It is essential to observe the information in the
description "Load response" in the document GF15.40-P-0001A.

WIS Documents
Alternator without interface
(conventional)
Alternator with BSS
interface
Alternator with LIN
interface

GF15.40-P-0001A
GF15.40-P-0001 B
GF15.40-P-0001C

Power supply for on-board electrical
system, function
Power supply for on-board electrical
system, function
Power supply for on-board electrical
system, function

For Engine 285 refer to GF15.40-P-00018 On-Board Electrical System Power Supply,
function

NOTE: One of the basic innovations is the diagnosis capability of the alternators with BSS-/LIN
interface. These can be tested with Star Diagnosis and without an external tester.
The test step is listed in DAS for the engine model designations stated below in the CDI engine
control unit under "Actuations" and "List of tests run", and/or in the ME engine control unit under
"List of tests run" and as of DAS-DVD 01/2006, also under "Actuations".
Whether a BSS interface or an LIN interface is present is recognized via the communication
between the DAS and engine control unit. The test prerequisites for the alternator test are listed in
the DAS and must be observed. The test itself is arranged as a test sequence and is menuassisted.
Additionally, the specified values have been updated for charging current and regulation voltage for
all alternators. In the process it should be noted in particular that the upper limit value of the
regulation voltage can now be up to 15 V. Refer to WIS for valid specified values.
All alternators which do not have a BSS-/LIN interface cannot be checked with Star Diagnosis.
Testing with Volt-Ampere-Tester continues to be planned for these The corresponding AR
documents are in the WIS).
Commercially available volt ampere testers should be used.

Engine and Corresponding Alternator
2

Ir

S-8-15.40173

Engine

Engine Control
Unit

Alternator

111

PEC, HFM-SFI,
ME2.0

Conventional (without interface)

112, 113, 155

ME2.8

Conventional (without interface)

137

ME2.7

Conventional (without interface)

166

ECM

Conventional (without interface)

266

SIM266

LIN

271

SIM4

BSS

272,273

ME9.7

LIN

275

ME2.7.1

Conventional (BSS alternator, but not supported
bv enaine control unit\

275

ME2.7.2

LIN

285

ME2.7.1

Conventional (BSS alternator, but not supported
by enQine control unit)

611,612,613

COi

Conventional (without interface)

628

COi V1

Conventional (BSS alternator, but not supported
bv enaine control unit\

629

COi 5

LIN

640

COIA

LIN

642

COl4

LIN

646

COi 3

Conventional (without interface\

646

COi 3 (UP)

BSS

647

CDl4

Conventional (without interface)

648

COi 3 IUP\

BSS

668

COi

Conventional (without interface)

Engines on Which Alternator Test Can Be Carried Out with DAS
Enaine

Enaine Control Unit

Alternator

266

SIM266

LIN

271

SIM4

BSS

272,273

ME9.7

LIN

275

ME2.7.2

LIN

285

ME2.7.2

LIN

S-8-15.40173

I1

3

Enaine

Enaine Control Unit

Alternator

640

COIA

LIN

646,648

CDI 3 IUP\

BSS

642

CDl4

LIN

629

CDI 5

LIN

4

I1

S-B-15.40173