Basic Instructions For Troubleshooting - Yamaha TMAX 2020 Service Manual

Self-diagnosis with the ABS ECU
The ABS ECU performs a static check of the entire system when the ON/start switch is pushed. It also
checks for malfunctions while the vehicle is ridden. Since all malfunctions are recorded after they are
detected, it is possible to check the recorded malfunction data by utilizing the YDT when the ABS ECU
has entered the self-diagnosis mode.
TIP
The ABS performs a self-diagnosis test for a few seconds each time the vehicle first starts off after the
ON/start switch was pushed. During this test, a "clicking" noise can be heard from front side of the ve-
hicle, and if the front brake lever and rear brake lever are even slightly applied, a vibration can be felt
at the levers, but these do not indicate a malfunction.
Special precautions for handling and servicing a vehicle equipped with ABS
ECA17620
NOTICE
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 and hydraulic unit are united assemblies and cannot be disassembled.
• The malfunction history is stored in the memory of the ABS ECU. Delete the DTC when the service is
finished. (This is because the past DTC will be displayed again if another malfunction occurs.)
EAS32895

BASIC INSTRUCTIONS FOR TROUBLESHOOTING

1. Check the DTC of "malfunction" using the YDT.
2. Check and repair the malfunction according to applicable DTC troubleshooting.
3. Push the OFF/LOCK switch, and then push the ON/start switch, and then check the DTC of
"malfunction" is not displayed.
TIP
• If another DTC is displayed, repeat steps (1) to (3) until no DTC is displayed.
• Push the OFF/LOCK switch will not erase the malfunction history.
4. Do the final check.
EWA17420
WARNING
• Perform the troubleshooting [A][B][C] 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.
ABS (Anti-lock Brake System)
9-33