Campaign - Electronic Accelerator Module, False Codes: Overview

REF. NO.
MBNA 30/4



TO:
OUR MERCEDES-BENZ PASSENGER CAR DEALERS

DATE:
June 1992



SUBJECT:
ENGINE 104.990, 119.970/971/974/975 WITH ASR REPLACEMENT OF ELECTRONIC ACCELERATOR CONTROL MODULE


The Electronic Accelerator control module (used on cars with ASR) must be replaced in vehicles that fall within the range of engine numbers listed below. Always check with the Vehicle Master Inquiry to determine if the work needs to be done on a specific vehicle. The affected control modules contain software that may be too sensitive to certain conditions, resulting in the ASR warning lamp lighting, or the Electronic Accelerator system entering "limp-home" mode, combined with the storage of false failure codes. The codes tend to be related to the Electronic Accelerator actuator and the CAN-bus, but are not always consistent.





Effective Serial Number Range






The new control modules have a production date of 16/92 (week 16 of 1992) or later stamped in blue. An additional way to identify the new modules is to check the "K" number, (circled in Fig. 1.)






"K" - number level



Vehicles that are in for service should be checked to determine if the new control module has been installed. If not, the new module should be installed according to the following chart. Customers whose vehicles are not scheduled for service in the very near future should be contacted and asked to bring their vehicles in specifically for this purpose.