Yamaha YZF-R1 2020 Service Manual page 711

EAS20613
P1600
EAS33093
TROUBLESHOOTING
Item
Lean angle sensor: open or short circuit detected.
Fail-safe system
• Unable to start engine
• Unable to drive vehicle
Procedure
TIP
If more than one DTC is detected at the same time, perform troubleshooting of DTC listed below first.
• U0125
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", then to "OFF", and back to "ON".
c. 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", then to "OFF", and back to "ON".
c. 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".
9-216
P1600