XY Powersports XY500UTV, Service Manual

Page: 252 / 259

13. TROUBLESHOOTING
13-17
Ref no Operation Test
result
Next Steps
yes next
1 Contact fuel pressure meter(contact front point of oil input
pipe of injector), starting engine, check the fuel pressure
whether is around 300kPa or not
no examine and repair
oil support system
yes next
2
Pull out ignition coil, and contact with spark plug, keep
pole of spark plug 5mm away of body of engine, starting
engine and check it whether has blue-white spark fire or
not.
no Examine and repair
ignition system.
yes
Examine and repair
wiring or replace
sensor
3 Pull out connector of engine water temperature sensor,
starting engine, observe engine whether succeed starting or
not at this moment. (or in series a 2500
Ω resistant instead of
engine water temperature sensor, observe engine whether
succeed starting or not at this moment.)
no next
yes
Clean throttle valve
body and idle speed
air duct
4 Draw accelerograph gently, observe it whether starting
engine easily or not.
no next
yes
Replace
5 Disassembly injector, and check the injector by special
washing analysis instrument if exists the phenomena of
leaks or clogs
no next
yes Replace fuel
6 Check fuel and observe the fault if caused after fueling
no next
yes
Eliminate engine
mechanism fault
7 Check compression of cylinder and observe the pressure if
it is discrepantly.
no next
yes Diagnosis help
8 Contact EFI commutator, open ignition switch, check
ECU5#
、
10#
、
13# stitch, the power whether supply
normally or not, check 2#
、
21# stitch whether Put up iron or
not.
no Examine and repair
relevant wiring
（
5
）
Regularly rotate speed, but engine starting hard at any time
Possible defective part
：
1
、
fuel containing water
；
2
、
fuel pump
；
3
、
engine water temperature
sensor
；
4
、
injector
；
5
、
ignition coil
；
6
、
throttle valve body and idle speed side air duct; 7
、
input
air duct
；
8
、
ignition timing
；
9
、
spark plug
；
10
、
engine mechanism part
Overhaul:
Ref no Operation Test result Next Steps
yes Examine and repair
air input system
1 Check air cleaner and input air duct whether are clogged
or not
no next
13