S 500 Sedan (140.051) V8-5.0L (119.970) (1994)
Component Locations
LOCATION
It is fitted to the driver side wheelhouse and is installed with a heat conducting paste.
Operation
OPERATION
The EZL/AKR control module receives information concerning:
^ Voltage supply (+)
^ Engine speed from crankshaft position sensor (L5)
^ Cylinder #1 position from camshaft position sensor (L5/1)
^ Engine load condition from intake manifold vacuum signal
^ Selection of ignition map from EZL/AKR reference resistor (R16/2)
^ Shift preconditions from transmission overload protection switch (S65)
^ Combustion knock from knock sensors (A16)
^ Fuel injection information from LH control module (N3/1)
^ Throttle position from Electronic accelerator control module (N4/1)
^ ABS/ASR information from ABS/ASR control module (N30/1)
The EZL/AKR control module compares information from these inputs with ignition maps for typical load and speed ranges which are stored in
the microcomputer. The optimal ignition timing for each operating condition is instantaneously determined from the stored maps and the power
output stage switches the primary current of the ignition coils.
Furthermore, a TD (engine speed) reference signal is provided to the LH control module, tachometer, on-board diagnostic connector, and the
diagnostic socket. To further increase operating reliability, a data exchange circuit has been added between the EZL/AKR control module and the
LH control module. Information concerning the coolant temperature, intake air temperature and the intake manifold absolute pressure is
continuously compared by the control module of each system.