Genuine Scooter Company Buddy 170, Service Manual

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9. Start-up normal but idle speed unstable or
stall with load such as front lamp applied
General trouble location: 1. ISC 2. Nozzle.
Procedure for general diagnoses:
No. Operating Procedure
Detection
Results
Subsequent Steps
Yes Clean relevant parts.
1
Remove the ISC and check the air throttle, the ISCand the idle
air bypass for any carbon deposition.
No Next step
Yes Go to Step 4.
No Next step 2
Check if the engine’s output power is increased with the load
applied; use the EMS diagnosis tester to check any change in
the ignition advance angle, duration of fuel injection, and air
input.
No Repair the air
regulating system.
Yes
Change the defective
nozzle.
3
Disassemble the nozzle and check the nozzle leaking or
blocked, or the flow out of tolerance with a nozzle cleaner &
analyzer.
No Next step
Yes Diagnosis assist
4
Connect an EMS adapter and press the power switch to check
voltages at Pins
1#, 19#, and 29#
; check grounding at Pins
8#
﹐
35
#
and
36#.
No
Repair the relevant
circuits.
20