Yamaha YZF-R1 Series Service Manual page 577

EAS20563
C1003
EAS33043
TROUBLESHOOTING
Item
Stepping motor: open or short circuit detected.
Fail-safe system
• Able to start engine
• Able to drive vehicle
Procedure
1. Connection of front fork stepping motor coupler.
• Check the locking condition of the coupler.
–Front fork stepping motor (left)
–Front fork stepping motor (right)
–Rear shock absorber assembly stepping motor (×2)
• Disconnect the coupler and check the pins (bent or broken terminals and locking condition of the
pins).
Is the coupler condition normal?
YES
→ Go to step 2.
NO
a. Connect the coupler securely or replace the wire harness and/or sub-wire harness.
b. Turn the main switch to "OFF" and back to "ON", and then check the condition of the DTC using the
malfunction mode of the YDT.
Is it in the "Recovered" condition?
YES
→ Service is completed.
NO
→ Go to step 2.
2. Connection of SCU coupler.
• Check the locking condition of the coupler.
• Disconnect the coupler and check the pins (bent or broken terminals and locking condition of the
pins).
Is the coupler condition normal?
YES
→ Go to step 3.
NO
a. Connect the coupler securely or replace the wire harness and/or sub-wire harness.
b. Turn the main switch to "OFF" and back to "ON", and then check the condition of the DTC using the
malfunction mode of the YDT.
Is it in the "Recovered" condition?
YES
→ Service is completed.
NO
→ Go to step 3.
3. Connection of front fork stepping motor sub-wire harness coupler.
• Check the locking condition of the coupler.
9-80
C1003