Engine control unit
42
Electrical and electronic systems
Introduction of New Generation of 4-Cylinder Inline Engines, OM 651
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CDI control unit
The CDI control unit is located on the air filter housing.
The CDI control unit is equipped with cooling fins at
the bottom which project inside the air filter housing
and are cooled by the intake air.
The task of the CDI control unit is divided into the
following subtasks:
• Engine torque control
• Injection control
•Charging
• Deceleration fuel shutoff
• Thermal management
• Exhaust gas recirculation (EGR)
• Exhaust treatment
The CDI control unit serves as an interface between the
drive train CAN (CAN
C) and the chassis CAN (CAN E).
The engine control system is equipped with a fault
memory and
powerful diagnostic functions for moni-
toring all system components and functions. This
incorporates the following aspects:
• Fault memory checking
• Engine control diagnosis
• European On-Board Diagnosis (EOBD)
• Diagnosis via CAN bus
• Diagnosis via K-line
CDI control unit on air filter housing
1 CDI control unit
2 Cooling fins
3 Air filter housing
4 Air filter
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