Yamaha XP500, Service Manual

Page: 306 / 559

4 - 108
CHAS
ANTI-LOCK BRAKE SYSTEM (XP500A)
• [C-5-1] Malfunction code 11 (Front wheel sensor signal is not received correctly.)
Set the main switch to “OFF”, then back to “ON” after removing the test coupler adaptor.
1) ABS warning light remains on.
→
Defective connection in the front wheel sensor circuit.
• Front wheel sensor coupler is disconnected.
→
[D-3]
• Front wheel sensor lead or coil is broken.
→
[D-3]
• Front wheel sensor circuit is broken.
→
(Refer to “CIRCUIT DIAGRAM”.)
• ECU (ABS) coupler terminal is disconnected.
→
[D-1]
2) ABS warning light comes on for 2 seconds, then goes off.
1
With the front wheel stopped, the rear wheel was rotated for more than 20 seconds. This is not a
malfunction.
2
A signal is not generated at the front wheel sensor.
• Front wheel sensor is not installed properly.
→
[D-3]
• Front wheel sensor rotor is defective.
→
[D-3]
3
Front wheel sensor circuit is short-circuited.
• Front wheel sensor or lead is short-circuited.
→
[D-3]
• Front wheel sensor circuit is short-circuited.
→
(Refer to “CIRCUIT DIAGRAM”.)
4
Front wheel sensor output drops.
• Sensor signal output may drop due to failure of the bearings, wheel axle, wheel or sensor hous-
ing of the front wheel. Check these components when installed for looseness, distortion, and
bends.
• [C-5-2] Malfunction code 12 (Rear wheel sensor signal is not received correctly.)
Set the main switch to “OFF”, then back to “ON”.
1) ABS warning light remains on.
→
Defective connection in the rear wheel sensor circuit.
• Rear wheel sensor coupler is disconnected.
→
[D-4]
• Rear wheel sensor lead or coil is broken.
→
[D-4]
• Rear wheel sensor circuit is disconnected.
→
(Refer to “CIRCUIT DIAGRAM”.)
• ECU (ABS) coupler terminal is disconnected.
→
[D-1]
2) ABS warning light comes on for 2 seconds, then goes off.
1
With the rear wheel stopped, the front wheel was rotated at a speed faster than 11 km/h. This is
not a malfunction.
2
A signal is not generated at the rear wheel sensor.
• Rear wheel sensor is not installed properly.
→
[D-4]
• Rear wheel sensor rotor is defective.
→
[D-4]
3
Rear wheel sensor circuit is short-circuited.
• Rear sensor or lead is short-circuited.
→
[D-3]
• Rear wheel sensor circuit is short-circuited.
→
(Refer to “CIRCUIT DIAGRAM”.)
4
Rear wheel sensor output drops.
• Sensor signal output may drop due to failure of the bearings, wheel, or sensor housing of the rear
wheel. Check these components when installed for looseness, distortion, and bends.
NOTE:
_
If the vehicle is ridden on extremely uneven roads continuously, the ABS warning light may flash
and malfunction code 11 or 12 may be recorded depending on the condition.