Electronic Control Unit (Ecu)

On 420 and 560 sedan models the ECU is located behind the right kick panel on the passenger side. On 560 SL models the ECU is located under the right kick panel on the passenger side.

With ignition switched on, the ECU is connected to battery voltage. To prevent voltage fluctuations when vehicle components are switched on, the ECU is provided with a voltage protection relay.

The ECU unit utilizes various input signals for control of fuel delivery and exhaust emissions. Input signals are converted into corresponding current values and are sent to the differential pressure regulator and to idle speed air valve.