Yamaha YZF-R1 Series Service Manual page 568

EAS20689
C0520 (FI)
EAS33319
TROUBLESHOOTING
Item
Abnormal IMU
Fail-safe system
• Able/Unable to start engine
• Able/Unable to drive vehicle
Procedure
1. Connection of IMU 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 2.
NO
a. Connect the coupler securely or replace the wire harness.
b. Turn the main switch to "ON", and then check the condition of the DTC using the malfunction mode
of the YDT.
Is it in the "Recovered" condition?
YES
→ Go to step 7, and complete the service.
NO
→ Go to step 2.
2. Connection of ECU 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.
b. Turn the main switch to "ON", and then check the condition of the DTC using the malfunction mode
of the YDT.
Is it in the "Recovered" condition?
YES
→ Go to step 7, and complete the service.
NO
→ Go to step 3.
3. Wire harness continuity.
• Disconnect the ECU coupler "1", joint coupler "2", IMU coupler "3" and ignition fuse "4".
• Open circuit check
Between ECU coupler and joint coupler
blue/white–blue/white
blue/black–blue/black
9-71
C0520 (FI)