Yamaha XP500 Service Manual page 308

• [C-5-6] Malfunction code 31 (Disconnection is detected between the fail-safe relay and the
hydraulic unit solenoid.)
Check the following:
1) ABS motor fuse
• Check if the ABS motor fuse beside the battery is blown.
2) Hydraulic unit solenoid coupler
• Check if the hydraulic unit solenoid coupler located in the front cowling is connected properly.
3) Wire harness (ABS system circuit)
• Check the pink/white leads between the ECU (ABS) and the fail-safe relay for continuity. (Refer
to "CIRCUIT DIAGRAM".)
• ECU (ABS) coupler terminal (pink/white) is disconnected.
• Check the red leads between 1 and 2, and between 1 and 3 of the hydraulic unit solenoid cir-
cuits for continuity.
4) Fail-safe relay
• Check if the fail-safe relay operates correctly.
5) Wire harness (ABS system circuit)
• Check for continuity between the red terminal of the fail-safe relay coupler and the positive bat-
tery terminal.
• Remove the ABS fuse and check for continuity between the brown/white lead of the fail-safe
relay coupler and the ABS fuse. (See the illustration below.)
• [C-5-7] Malfunction code 32 (Fail-safe relay malfunction is detected.)
Check the following:
1) Fail-safe relay
• Check if the fail-safe relay operates correctly.
2) Wire harness (ABS system circuit)
• Disconnect the couplers from the fail-safe relay and the ECU (ABS), and then check the insula-
tion of the fail-safe relay coupler between the red and red terminals.
ANTI-LOCK BRAKE SYSTEM (XP500A)
Fail-safe
relay
red
Check for continuity between these two points 1.
R B R/W W/B
P/W Br/W W/R R
1
Front
solenoid
red
red
Rear
solenoid
1
4 - 110
CHAS
→ [D-1]
→ [D-2]
30
5 10 5
→ [D-2]