FUEL SYSTEM
Electronic Control System
6-42 6LY3 Service Manual
© 2007 Yanmar Marine International
ECU Control Data Management in Service Shop
Figure 6-52 shows the ECU control data flow within a service shop when injection pump replacement is
required. In the case of replacing a fuel injection pump, the ECU of the engine must be rewritten by the
Pump Adjustment Data by using a YDT. The rewriting of the ECU control data is performed by Yanmar
authorized personnel when replacement of an ECU or its components is necessary.
NOTICE:
1. Data rewriting is permitted only by an authorized Yanmar technician.
2. Data rewriting is performed by using a YDT, which was originally developed by Yanmar. YDT consists of
PC-software, engine interface and connections.
3. YDT requires password access to handle this data.
Figure 6-52
Figure 6-52
PUMP with DATA
YDT
PUMP IDENTIFICATION DATA
PUMP DATA
PUMP ADJUSTMENT DATA
ECU
0005716
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