YG125-25 Maintenance Manual
Engine management system
Major parts and components
Maintenance depending on the performance.
Before issue analysis, please check:
1)
The MIL works well.
2)
Clear the history malfcode.
3)
When the malfcode comes again, note the condictions.
Check the appearance
1)
Whether there is leakage of the fuel pipe or not.
2)
Whether there is block/leakage or damage of the intake pipe.
3)
Ageing level of the high-voltage cable.
4)
Whether the ground connection is strong enough.
5)
All the connectors connected well.
Note: if any item above exists, please do the fix it at first before issue analysis.
Diagnostic Help
：
1)
Make sure there is no any issue record of the engine.
2)
Make sure the issue could repeat.
3)
Have checked follow the instructions above and no cause found.
4)
Do not ignore the maintenance situation, cylinder pressure, mechanical timing and fuel quality.
Fuel Injector
Idle speed control valve
Electronic control unit( ECU)
Oxygen sensor
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Summary of Contents for YG125-25
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Page 130: ...YG125 25 Maintenance Manual Illumination signal system Circuit schematic drawing 134...
Page 144: ...YG125 25 Maintenance Manual Electrical System Diagram 19 Electrical System Diagram 148...
