Troubleshooting - KYMCO AHG5 Service Manual

13. Fi DIAGNOSTIC TOOL

5.3. TROUBLESHOOTING

No Complaint
1
Engine will not
start, or is hard to
start.
Symptom
Starter motor does
not run
Starter motor runs
but the engine does
not crank
Engine does not run
No fuel pass through Insufficient fuel
Engine overflow
No spark/ weak
spark
Probable Cause
Ignition switch malfunction
Starter motor malfunction
Battery low
Starter relay malfunction
Start button bad connection
Open circuit, short circuit
Start button malfunction
Engine stop switch malfunction
Fuse burnt
Starter clutch malfunction
Valve seized
Rocker arm seized
Piston seized
Big end or small end of the rod seized
Crankshaft seized
Drive gear or bearing seized
Camshaft seized
Balance shaft bearing seized
Fuel tank breathe hole clogged
Fuel filter clogged
Fuel pump malfunction
Fuel hose clogged
Clean the spark plug
Starting technical error (the engine cannot be
started when the throttle is fully open during
overflow, which will make the EMS supply more
fuel)
Ignition switch turn off
Engine stop switch is at off
Gear not at neutral gear
Battery low
Spark plug contaminated or broken
Spark plug cap or high tension lead broken
Spark plug cap short circuit or poor connection
Faulty spark plug
ECU broken
Open circuit/ Protection switch/ Side stand switch
13
DT X360