XY Powersports XY500UTV, Service Manual

Page: 253 / 259

13. TROUBLESHOOTING
13-18
yes next
2 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
3 Pull out ignition coil, and contact with spark plug, keep
pole of spark plug 5mm away with body o f engine,
starting engine and check it whether has blue-white high
pressure fire or not.
no examine and repair
ignition system
yes next
4 Check spark plug, look its type and gap if accords with
standard.
no Adjust or replace
yes Examine and repair
wiring or replace
sensor
5 Pull out connector of engine water temperature sensor,
star ting engine, observe engine whether succeed starting
or not a t this moment.
no next
yes Clean throttle valve
body and idle speed
air duct
6 Draw accelerograph gently, observe it whether starting
engine easily o r not.
no next
yes replace
7 Disassembly injector, and check the injector by special
washing analysis instrument if exists the phenomena of
leaks or clogs
no next
yes Replace fuel
8 Check fuel and observe the fault i f caused after fueling
no next
yes Eliminate engine
mechanism fault
9 Check compression o f cylinder and observe the pressure
if is discrepantly.
no next
yes next
10 Check engine ignition timing if accords with standard .
no examine and repair
ignition timing
yes Diagnosis help
11 Contact EFI commutator, open ignition switch, check
ECU5#
、
10#
、
13# stitch the power whether supply normal
or
not, check 2#
、 21# stitch whether Put up iron r not.
no Examine and repair
relevant wiring
（
6
）
Eng in e works regularly
，
but unsteady idle speed at any time
Possible defective part
：
1
、
fuel containing water
；
2
、
injector ; 3
、
spark plug
；
4
、
throttle valve body and
idle speed side air duct
；
5
、
input air duct
；
6
、
id le speed valve; 7
、
ignition timing
；
8
、
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 o r not
no next