The Motronic 37 is a development of the 35-pin Mono-Motronic system. The Motronic 37 is an electronic system which controls fuel injection, ignition, idle speed etc. The Mono-Motronic system controls fuel metering via a (mono) injection signal, although there are variants of the Motronic 37 which employ four valves, all connected to the same signal. The system uses values from two throttle potentiometers to control the fuel metering. The fuel quantity is adjusted to compensate for air and engine temperature with the aid of two temperature sensors and, for the exhaust gas´ oxygen content, a lambda sensor. The Mono-Motronic also regulates idle speed by means of a valve. Certain versions of the system also have an knocking sensor for the correction of ignition timing.
Wirning diagram
This wiring diagram is an example. Check in the relevant workshop manual for the diagram of the car you are working with.
Source
Thursday, June 3, 2010
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