Genuine Scooter Company Buddy 170, Service Manual

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3. Trouble of hot start
General trouble location: 1. Water in fuel; 2. Fuel pump; 3. Engine temperature sensor; 4. Ignition coils
Procedure for general diagnoses:
No. Operating Procedure
Detection
Results
Subsequent Steps
Yes Next step
1
Connect a fuel pressure gauge before the fuel inlet of the nozzle;
start the engine to check the fuel pressure at 300kPa or so.
No
Repair the fuel
supply system.
Yes Next step
2
Disconnect the ignition cable and connect a spark tester; start the
engine and check any high-voltage flash (blue/white).
No
Repair the
ignition system.
Yes
Correct circuits
or replace the
sensor.
No Next step
3
Press the engine temperature sensor connector and start the
engine; check if the engine successfully started. (Or
install a
series-connected resistor (300 Ω ) in lieu of the engine
temperature sensor at the engine temperature sensor
connector.
Check if the engine is successfully started.)
No Next step
Yes Replace fuel.
4 Check fuel and observe any trouble attributed to fuel just added.
No Next step
Yes Diagnosis assist
5
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.
14