37
ANTI-LOCK BRAKE SYSTEM (ABS)
CHAS
WARNING
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 of meter panel alerts the malfunction.
Trouble shooting mentioned below describes the cause pursuing and service method according to the in-
dication by ABS warning light. For troubleshooting other than these items, perform by following the normal
service method.
When the maintenance or check has been performed on related parts to ABS, be sure to execute the
“final check” before delivering the scooter to the customer. Refer to [D-6] FINAL CHECK.
1. 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.
2. Self diagnosis and services
ECU has the 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 mal-
function history.
“In case malfunctions are detected”
It is disabled to call the malfunction code by using the ABS warning light 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])
“In case any malfunctions are not detected” It is possible to call the malfunction code by using the ABS warn-
ing light. You can check it by using a pocket tester. Note everything if more than two items of malfunction
codes are recorded.
