Relay Control

OPERATION
The Digital Motor Electronic (DME) main relay is activated by the DME control unit as of ignition ON. After shutting down the engine, the relay remains on for a further 3 sec. in order to avoid post-ignition.

The fuel pump relay (EKP) is activated as of ignition ON as soon as the DME control unit receives engine speed signals from the crankshaft pulse generator.

At ignition ON. power is briefly applied to EKP relay for approx. 0.5 sec in order to build up the fuel pressure. The fuel pump runs continuously after the engine has started.

The oxygen sensor heating relay is activated as of ignition ON. It is switched off dependent on engine speed and load.