Doosan D20S-5 Operation & Maintenance Manual page 104

Operation Section
Problem
Rough Idle (Gas)
High Idle Speed
(Gas)
Probable Cause
Incorrect Idle speed control
Incorrect timing or spark control
Engine Mechanical
Incorrect Idle speed control
Throttle sticking
Foot pedal sticking or incorrect
pedal signal
Corrective Action
See Advanced
Service Manual
See Engine Service Manual
See Advanced
Service Manual
Check pedal return spring travel for binding
See Advanced Diagnostics
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Diagnostics & Engine
Diagnostics & Engine