300E 4MATIC (124.230) L6-3.0L (103.985) (1990)
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55 Pin CIS-E Control Unit Terminal Designations
The CIS-E system precisely controls fuel injection quantity under varying operating conditions. The CIS-E control unit evaluates information provided
by various sensors concerning engine operating conditions, and from the information received generates a control signal for the electro-hydraulic
actuator. Input signals include:
^
Overvoltage protection relay B+
^
Coolant temperature sensor
^
Electronic ignition control unit (EZL)
^
Air flow sensor position indicator
^
Throttle valve switch (idle and full load)
^
Electronic speedometer
^
Microswitch
^
Oxygen sensor
^
Intake air temperature sensor
^
Transmission range selector
^
Engine systems (MAS) control unit
The electro-hydraulic actuator regulates pressure in the lower chambers of the CIS-E fuel distributor which provides for the optimal fuel quantity.
Furthermore, the CIS-E control unit provides output signals for operation of the:
^
The fuel pumps
^
Purge switchover valve
^
Idle control valve
^
Start valve
^
Transmission shift point delay
^
EGR switchover valve
^
Engine systems (MAS) control unit
^
On-Off ratio output (Diagnostic Socket)
^
"Check Engine" warning lamp
