C0520; Troubleshooting - Yamaha MT-09 2021 Service Manual

EAS20560

C0520

EAS33319

TROUBLESHOOTING

Item
ECU: no normal signals or malfunction signals are received from the 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", IMU coupler "3" and ignition fuse 1 "4".
• Remove the joint coupler cap "2".
• Open circuit check
9-88
C0520