System overview DENSO
DENSO EMS is a new engine control system located on all B52X4S engines from and including 1999 model year. The system is largely similar to Motronic 4.4 in terms of the sensors and their functions.
The biggest new feature is the communication between the ECM and other modules, which occurs via a data network.
The system has other new features:
- ETS (Electronic Throttle System) that includes ETM (Electronic Throttle Module) and APM (Accelerator Pedal Module)
- AACV (Air Assisted Control Valve)
The following communicate by ECM via the network:
- TCM (Transmission Control Module)
- ETM (Electronic Throttle Module)
- ABS (Antilock Braking System)
- CDM (Can and Driver information Module)
- DLC (Diagnostic Link Connector)
DENSO 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. These exceptions are covered on the following pages.
For more information about the electronic throttle unit system and related components such as the throttle unit, accelerator pedal sensor, stop lamp switch, clutch pedal sensor switch and brake pedal position sensor, see Design and Function .