3. Fuel Injection System
EFi system diagnosis methods
When wrong signal occurs in motorcycle injection system, causing engine abnormal function or
unable starting, the check light at the meter will be lighting to inform drivers to carry out
maintenance.
While overhauling, diagnostic tool or meter flashing lighting identification can be applied to carry
out fault detection.
After troubleshooting maintenance, the check light will be off, but ECU will record the fault code.
Thus, fault code should be eliminated. There are two methods of fault elimination, one is using
diagnostic tool and the other is manual elimination.
Using diagnostic tool
Connect diagnostic tool and the test switch and check in accordance with diagnostic tool using
method. When EFi system or EFi parts malfunction is detected, replace or correct parts
according to information shown on the screen. After maintenance, fault code should be
eliminated, or the fault will exist in ECU.
Manual inspection
Use jumping wire (wire or paper clips, etc.) to ground test switch, check light on the meter will be
flashing, meaning that the injection system or parts is abnormal. When no diagnostic tool is
available, the long and short flashings can be used to tell the fault cause.
Test switch
coupler
Diagnostic tool coupler
Diag
nostic tool coupler and test switch coupler
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