Yamaha XP500 Service Manual page 309

• [C-5-8] Malfunction code 33 (ABS motor operation malfunction is detected. [ABS motor
stops and does not rotate.])
Check the following:
1) ABS motor fuse
• Check if the ABS motor fuse beside the battery is blown.
2) Fail-safe relay
• Check if the fail-safe relay operates correctly.
3) Wire harness (ABS system circuit)
• Remove the fail-safe relay and the ABS motor fuse, and then check for continuity between the
red terminal of the wire harness (ABS system circuit) and the wire harness (ABS system circuit)
end (terminal A shown in the illustration) of the ABS motor fuse terminal beside the battery.
(Refer to "CIRCUIT DIAGRAM".)
1
5
• Check for continuity between the positive battery terminal and the battery end of the ABS motor
fuse terminal (terminal B shown in the above illustration).
• Remove the ECU (ABS) and the fail-safe relay from the wire harness (ABS system circuit), and
then check for continuity between the white/black lead terminals and the red/white lead termi-
nals.
• [C-5-9] Malfunction code 34 (ABS motor operation malfunction is detected. [ABS motor
keeps rotating and does not stop.])
Check the following:
1) ABS motor
• Check if the ABS motor coupler located in the battery cover is connected properly.
• Check the ABS motor for continuity.
2) Wire harness (ABS system circuit)
• Remove the ABS motor coupler and check for continuity between the brown/white terminal of the
ABS motor coupler and the negative battery terminal.
• Remove the ECU (ABS) coupler and check for continuity between the red/white terminal of the
ECU (ABS) coupler and the red/white terminal of the ABS motor coupler.
• Remove the fail-safe relay and check for continuity between the red/white terminal of the ABS
motor coupler and the positive battery terminal.
3) Fail-safe relay
• Check if the fail-safe relay operates correctly.
ANTI-LOCK BRAKE SYSTEM (XP500A)
2
30
10 5
1 Terminal A
2 Terminal B
4 - 111
CHAS
→ [D-2]
→ [D-5]
→ [D-1]
→ [D-2]