Yamaha FJR13AEV(C) Service Manual page 605

Self-diagnosis and servicing
The ABS ECU has a self-diagnosis function. By utilizing this function, quick problem identification and
service are possible. Previous malfunctions can be checked since the ABS ECU also stores the mal-
function history.
In case malfunctions are detected:
The light cannot be used to recall the malfunction codes from the memory of the ABS ECU if the ABS
warning light is already on. Connect the test coupler adapter to the ABS test coupler, and then connect
a pocket tester to the light green terminal of the adapter and the positive battery terminal to determine
the malfunction codes by the movement of the pocket tester needle.
In case any malfunctions are not detected:
The multi-function display indicates all the malfunction codes recorded in the ABS ECU.
You can also recall the malfunction codes by using a pocket tester. Note all of the indicated malfunction
codes if more than two malfunction codes are stored in the memory.
Deleting the malfunction code(s):
When the service is finished, check the normal operation of the vehicle, and then delete the malfunction
code(s). (Refer to "[D-3] FINAL CHECK" on page 8-157.) By deleting the malfunction codes stored in
the ABS ECU memory, it is possible to pursue the cause correctly if another malfunction occurs.
Self-diagnosis using the ABS ECU
The ABS ECU performs a static check of the entire system when the main switch is turned to
"ON". It also checks for malfunctions while the vehicle is ridden. Since all malfunctions are record-
ed after they are detected, it is possible to check the recorded malfunction data by using a pocket
tester or by utilizing the multi-function display when the ABS ECU has entered the self-diagnosis
mode.
Special precautions for handling and servicing a vehicle equipped with ABS
EC3P61030
CAUTION:
Care should be taken not to damage components by subjecting them to shocks or pulling on
them with too much force since the ABS components are precisely adjusted.
• The ABS ECU, hydraulic unit, wheel sensors, and ABS motor relay are united assemblies and cannot
be disassembled.
• The malfunction history is stored in the memory of the ABS ECU. Delete the malfunction codes when
the service is finished. (This is because the past malfunction codes will be displayed again if another
malfunction occurs.)
EAS27800
BASIC INSTRUCTIONS FOR TROUBLESHOOTING
EW3P61004
WARNING
• Perform the troubleshooting [A] → [B] → [C] → [D] in order. Be sure to follow the order since
a wrong diagnosis could result if the steps are followed in a different order or omitted.
• Use sufficiently charged regular batteries only.
[A] Malfunction check using the ABS warning light
[B] Detailed check of the malfunction
The results of the self-diagnosis by the ABS ECU can be displayed using the multi-function display or
a pocket tester.
[C] Supposing the malfunction cause and position
Find the malfunction cause by reasoning the place and situation where it occurred.
[D] Servicing the ABS
Execute the final check after disassembly and assembly.
ABS (ANTI-LOCK BRAKE SYSTEM)
8-134