D
Volvo Trucks North America Date Group No. Page
Service Bulletin 11.2006 230 247 11(11)
Engine Electronic Control Unit (EECU)
W2003778
The engine electronic control unit is the central part of the
injection system. It is located on the left-hand side of the
engine. The EECU receives continuous information from
the accelerator pedal and from several other sensors on
the engine. It calculates the amount and the time to inject
fuel into the cylinders. Electrical wiring to the unit injector
fuel valves transmits control signals to the injectors.
The EECU uses the flywheel sensor to monitor engine
rotation and engine speed variations during a revolution.
This allows the EECU to ensure that each unit injector
receives exactly the correct amount of fuel. The EECU
stores information when a fault occurs or if something in
the system is abnormal. Occasional faults are also stored
and can be traced at a later time.
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