TROUBLESHOOTING
Electronic Control System
13-26 6LY3 Service Manual
© 2007 Yanmar Marine International
ELECTRONIC CONTROL SYSTEM
The 6LY3 series engine is equipped with an Electronic Control System (ECS). The ECS includes an Engine
Control Unit (ECU), an engine interface module, an electronic governor and an electro-hydraulic timer.
These components are attached to the fuel injection pump, control fuel injection quantity and injection timing
electronically.
Engine Control System Diagram
The ECU controls fuel injection quantity and injection timing by interpreting engine operating parameters
such as throttle positions, gear shift selections and control panel displays. It monitors engine conditions such
as temperature, pressure and flow rates.
Yanmar Diagnostic Tool (YDT)
Figure 13-4
Figure 13-4
0006306
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