DENSO Engine Management System

The DENSO engine management system is a new system used on all B52x4S engines. The system is largely similar to the previous Motronic 4.4 in terms of the sensors and their functions. The largest new feature is the communication between the engine control module (ECM) and other modules via a computer network.

There are also other new features in the system:

• Electronic throttle system which covers both the electronic throttle module and the accelerator pedal module
• Assisted Air Control Valve (AACV)

The following communicate with the Engine Control Module (ECM) via the network:

• Transmission Control Module (TCM)
• Electronic Throttle Module (ETM)
• Anti-Lock Braking System (ABS)
• Can and Driver information Module (CDM)
• Data Link Connector (DLC)

The DENSO system contains a large number of sensors which function according to known principles and send information by analog signals directly to the ECM.

As applies to output signals and controlled components these also function to known principles, with a few exceptions.