Quite a sophisticated Diesel Engine management system ECU. Manufactured by Bosch, this ECU is most often referred to in BMW terminology as version 4.0 of its DDE (Digital Diesel Electronics) series. However in Bosch terminology circles the physical ECU itself can often be denoted having some sub suffix of the EDC (Electronic Diesel Control). Being a flash based ECU with a huge memory the entire code that controls its operationally and functionality including its self diagnostic capability is determined by whatever version of software is programmed into it. This means that although the ECU may be physically the same as that used in other applications such as the TD6 Range Rover, dramatic changes in the communications and the coding mean that different applications require different modules. This module is specifically written deals with the ECU when programmed to suit the small four cylindered Turbo dies engine found in the TD4 Freelander introduced for 2001 onwards up to present day and a small variety of similarly aged Rover and MG vehicles.

Although it is a modern enough ECU to fully support the limited degree of information and fault codes provided for by enforced OBDII compliance, there are of course many more fault codes, functions and features that this module gives access to including security link learning and re synchronization.