Yamaha FZ1-N 2007 Service Manual page 452

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EAS27790
ABS TROUBLESHOOTING OUTLINE
This section describes the troubleshooting about ABS in details. Read carefully this service manual
before repairing various malfunctions, understand and perform the service.
Electronic control unit (ECU) has the self diagnostic function. When failures occur in the system, the
ABS warning light on the meter assembly indicates a malfunction.
Troubleshooting mentioned below describes the cause pursuing and service method according to
the indication by the multi-function display. For troubleshooting other than these items, perform by
following the normal service method.
EWA13880
WARNING
When maintenance or checks have been performed on components related to the ABS, be
sure to perform a final check before delivering the vehicle to the customer.
(Refer to "[D-6] FINAL CHECK" on page 8-121.)
ABS warning light goes on and the ABS condition
1 When the ABS warning light keeps going on → It works as a normal brake.
• Detecting the malfunction by means of the ABS self diagnostic function.
2 Light goes on and off at the time of starting → ABS operation is normal.
• ABS warning light goes on for 2 seconds every time the main switch is turned on and goes off
afterward.
• ABS warning lights go on while the starter switch is pushed.
3 When the ABS warning light flashes → ABS operation is normal.
• Brake switch is defective or improperly adjusted.
• Rear wheel is racing.
• Continuous riding on extremely uneven roads.
• Other defective
Self diagnosis and services
The ABS ECU has a self diagnostic function. By utilizing this function, quick and secure services are
possible. Previously occurred error phenomenon can be checked since it also installs the memory
for storing malfunction history.
"In case malfunctions are detected"
It is disabled to call the malfunction code by using the multi-function display since the ABS warning
light already goes on. Connect the test coupler adapter to the test connector, connect a pocket
tester to the terminal of light green lead and check by its pointing needle movement.
Refer to "[B-5] MALFUNCTION CHECK BY THE ABS SELF DIAGNOSIS (PRESENT MALFUNC-
TION)" on page 8-102.
"In case any malfunctions are not detected"
The multi-function display indicates all the malfunction codes recorded in the ABS ECU. You can
check it by using a pocket tester. Note everything if more than two items of malfunction codes are
recorded.
"Deleting the malfunction code"
When the malfunction service is finished, check the normal operation of vehicle then delete the mal-
function code. By deleting the malfunction code memory, it is possible to pursue the cause correctly
if the next defective phenomenon occurred.
Self diagnosis by ABS ECU
ABS ECU performs the static check for whole system when the main switch is turned on. It is also
possible to check the malfunction while riding. It is possible to check the recorded malfunction data
by using a pocket tester or the multi-function display of meter by setting the ABS ECU to the self
diagnostic mode since all malfunctions which has been once detected are recorded.
email: info@motomatrix.co.uk
ABS (ANTI-LOCK BRAKE SYSTEM)
8-97