Engine Controls - Software Calibration Number Coding
Date: July 2OO2Order No.: S-SI-07.08/001
Group: 07
SUBJECT:
ALL MODELS, MODEL YEAR 2003
SCN "VERSION" CODING OF ENGINE CONTROL MODULES
As of model year 2003, a new coding method is required in the event an engine control module is replaced.
Emission regulations now require all codable (emission-relevant) electronic control modules have a Software Calibration Number (SCN) which uniquely identifies the control module version installed in the vehicle. This is done to prevent erroneous version coding.
The SCN is a 32-digit number. It identifies both the control module software as well as the coding conforming to the specific vehicle. An example of the SCN code and Coding string number can be found in this bulletin.
The SCN coding procedure for coding engine control modules will be introduced in three phases:
1. Interim procedure:
An interim procedure is now in effect for obtaining SCN coding information. The coding procedure is described in the procedure in this bulletin. Upon introduction of the fax procedure (below), this interim solution will no longer be valid and a revised bulletin with complete instructions will be issued.
2. Fax procedure (currently not available):
^ The vehicle coding information (VIN, ECM part no.) is accessed using Star Diagnosis.
^ Coding information is requested from the DCAG call center via fax.
^ The electronic control module is coded.
3. On-line procedure (replaces fax procedure)
A procedure is now being developed that will allow dealer technicians to access the SCN coding information via Netstar. This will eliminate the fax process and provide faster results through a direct on-line link to FDOK, a vehicle build data database. Shortly before this procedure becomes available to you, a revised bulletin with complete instructions will be issued.
Note:
Requires the use of proprietary Mercedes equipment and software. Contact Mercedes for further information.