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Engine Working Data Flow Displayed by Diagnostic Tool
Analyze and determine engine fault using the engine working data flow displayed by the diagnostic tool.
Step I
a) Engine harness and the vacuum pipeline—may affect the system to control air flow and fuel supply
b) Whether oxygen sensor is assembled in place—may affect the system to determine the air to fuel ratio
c) Engine fault indicator—may affect the system to give an alarm for fault
d) Battery voltage—determine whether the power of battery is sufficient
e) Determine whether coolant temperature sensor, intake air temperature sensor, intake air manifold absolute pressure sensor
and oxygen sensor display value are normal
f) Working range of throttle position sensor—it cannot be fully opened or closed, which may affect engine power
performance and some system functions
Step II
Whether ECU power is turned off—the communications between diagnostic tool and system is interrupted after turning off
key switch
Step III
a)
Coolant temperature and coolant temperature cycle—indicate whether the thermostat is working properly
b)
Battery voltage (14V) —Indicate whether the generator is working properly.
Too high: there may be fault in voltage regulator;
Too low: there may be improper connection of generator or generator fault
c)
Intake air manifold pressure—it can predict whether there is leakage in intake air and valve clearance problems
Valve clearance is too small: this value is too high, so engine power performance may be affected; in addition, due to
too early opening of exhaust valve and increase in exhaust temperature, oxygen sensor and three-way catalytic
converter service life may be significantly shortened;
Valve clearance is too large: it may cause low intake air manifold pressure, and thus affect the system to determine the
working state of engine, thus resulting in abnormal idle speed during warm-up of motorcycle.
In addition, if the exhaust system is blocked, for example: a foreign body exists in the exhaust channel; the oil
consumption is too high, thus blocking three-way catalytic converter; three-way catalytic converter is blocked due to
internal damage, which will cause slightly high value.
d)
Number of cycles of oxygen sensor value—the number of cycles is too small, indicating fault of oxygen sensor.
Concise Troubleshooting
Please follow the following steps to repair EFI system. To repair fault in one step, the subsequent steps may be stopped. And
then use diagnostic tool to conduct inspection and acceptance and clear trouble code according to section "Engine Working
Data Flow Displayed by Diagnostic Tool".
When using diagnostic tool, the voltage of battery should not be lower than 8.5 V.
Daily Use and Maintenance
• Gasoline should be high quality without lead.
•ECU has a moisture-proof function, but high-pressure water gun should not be used to rinse its shell.
•The fuel filter should be changed every 18,000 km.
•Under normal conditions of use, clean the throttle body every 10,000 km or 1 year.
Fault Phenomenon-Start Fault
a)
Rotate ignition switch to "On" position, and check whether engine fault lamp is on
If it is off:
Check fuse and grounding wire
Check whether ECU plug is connected firmly
It is able to check whether this lamp and line is normal using the check function of
diagnostic tool actuator
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Table of Contents
Troubleshooting
