Safety Fuel Cutout (SKA)

Safety fuel cutout (SKA)
The safety fuel cutout signal for the two DME control units can come on the one hand from the EMLIIIS control unit and on the other hand from the external safety path specially used for this purpose.

The safety path consists of the brake light switch, a 4-degree switch in the pedal position sensor (PWG) and 2 diodes in the pedal position sensor (PWG). This path independent of the EMLIIIS control unit ensures that a defective EMLIIIS control unit cannot activate the accelerator system uncontrolled since, when the accelerator pedal is not depressed (4-degree switch closed) the signal of the operated brake is routed via this path to both DME control units thus activating the safety fuel cutout.

2 driving situations which result in activation of the safety fuel cutout function are described in the following:
- When idle is detected, the EMLIIIS control unit automatically outputs the signal for safety fuel cutout to both DME control units.
- If the brake is pressed and the accelerator pedal is not depressed, the two DME control units additionally receive via the external safety path the brake signal as a request to activate the safety fuel cutout.
The correct status of the safety fuel cutout is constantly checked by the self- diagnosis function in the EMLIIIS control unit.


NOTE: The EML test adapter used in the previous EML to test the external safety path is no longer required in the EMLIIIS (EML test adapter 12 7 010/011 with adapter lead 12 7 012/013)