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Control module, EDC 15

Control module, EDC 15


The control module determines the maximum quantity of fuel permitted per combustion based on pre-programmed limits and the values of the various sensors. As this is taking place, a suitable moment for starting the pressure build-up in the diesel pump is also determined.

The control module is connected to the car with a 105-pin connector. The connection is divided into two connectors, one for the car and one for the engine:


- Pins 1 to 81 are connected to the car.

- Pins 82 to 105 are connected to the engine functions.


The control module is supplied with +15 and as there is no need for any adaptation to be stored in memory, +30 is not required. There is also a afterrunning function that must expire before the control module stops grounding the main relay. The afterrunning function is controlled by DICE via the I and P-buses, and starts when the ignition is turned to OFF, i.e. when the +15 supply to pin 39 is cut. While the afterrunning function is active, such things as storing any diagnostic trouble codes and diagnosis of the main relay take place. DICE keeps the EDC control module active (approx. 40 s) so that it can read the engine temperature and control the radiator fan.

Afterrunning must have expired when clearing diagnostic trouble codes, i.e. the main relay must be inactive before a diagnostic trouble code is definitely cleared.

When the ignition is turned to ON, the Check Engine malfunction indicator lamp goes on to confirm operation. If there are no system faults, the lamp will go off after 3.5 seconds or when the engine is started, whichever occurs first.

Fuel injection is mainly regulated by the position of the pedal, the engine coolant temperature and engine speed. There are substitute values for all the sensors available in the control module should a fault occur.