KYMCO AK 550, Service Manual

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10..Brake System
AK 550
ABS Troubleshooting Outline
The ABS indicator light lights up to alert the rider when an abnormality is detected
by the system. The service codes are stored in the ABS unit memory. The codes
will not be erased unless manually cleared. After the fault has been corrected
erase the service codes.
Even when the ABS is operating normally, the ABS indicator light may light up
under the conditions listed below. Turn the ignition switch OFF to stop the
indicator light. If the scooter runs without erasing the service codes, the light may
light up again.
□ After continuous riding on a rough road.
□ When the ABS has been subjected to strong electrical interference.
□ When tire pressure is abnormal. Adjust tire pressure.
□ When a tire different in size from the standard size is being used. Replace with
standard size.
□ When the wheel is deformed. Replace the wheel.
Much of the ABS troubleshooting work consists of confirming continuity of the
wiring. The ABS parts are assembled and adjusted by the manufacturer, so there
is no need to disassemble or repair them. Replace the ABS hydraulic unit if
needed.
The basic troubleshooting procedures are listed below.
□ Carry out pre-diagnosis inspections as a preliminary inspection.
□ Check wiring and connections from the ABS hydraulic unit connector to the
suspected ABS part, using the diagnosis tool.
Special tool - Diagnosis tester: 3620A-LEB2-E00
□ Visually inspect the wiring for signs of burning or fraying. If any wiring is poor,
replace the damaged wiring.
□ Pull each connector apart and inspect it for corrosion, dirt and damage. If the
connector is corroded or dirty, clean it carefully. If it is damaged, replace it.
□ Check the wiring for continuity.
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