XY Powersports XY500UTV, Service Manual

Page: 256 / 259

13. TROUBLESHOOTING
13-21
Possible defective part
：
1
、
idle speed valve
；
2
、
injector
Overhaul :
Ref no Operation Test
result
Next Steps
yes Clean related parts
1 Disassembly idle speed valve and check the throttle
valve body, idle speed valve and idle speed side air
duct whether have carbide accumulated or not.
no next
yes Turn step no.4
no next
2 Observe output power whether is increasing or not
when begin loading work, namely observe the
movement of ignition advance angle
、 injection pulse
width and air intake flowrate by EFI diagnosis
instrument
no Examine and repair
air condition system
ye Fault replacement
3 Disassembly injector, and check the injector by special
washing analysis instrument if exists the phenomena of
leaks, clogs or flux discrepantly.
no next
yes Diagnosis help
4 Contact EFI commutator, open ignition switch, check
ECU5#
、 10# 、 23# stitch, the power whether supply
normal or not, check 2# 、 21# stitch whether is putting
up iron or not.
no Examine and repair
relevant wiring
（
10
）
Engine starting regularly, but idle speed is too high.
Possible defective part ： 1 、 throttle valve body and idle speed side air duct ； 2 、 injector seat ； 3 、 idle
speed valve ； 4 、 engine water temperature sensor ； 5 、 ignition timing.
Overhaul:
Ref no Operation Test result Next Steps
yes adjust
1 Check the throttle cable if is clipped or too tight.
no next
yes Examine and repair
air intake system
2
Check air intake system and connector of injector
seat, the air if is leaking.
no next
yes Clean related parts
3 Disassembly idle speed valve and check the throttle
valve body, idle speed valve and idle speed side air
duct whether have carbide accumulated or not.
no next
yes Examine and repair
wiring or replace
sensor
4
Pull out connector of engine water temperature
sensor, starting engine, observe idle speed whether is
unsteady or not when engine is in warming-up.
no next
yes next
5 Check engine ignition timing if accords with
standard.
no
examine and repair
ignition timing
13