Yamaha YZF-R1 2020 Service Manual page 723

EAS20623
P1806, P1807
EAS33103
TROUBLESHOOTING
Item
• [P1806] Shift sensor: open or ground short circuit detected.
• [P1807] Shift sensor: power short circuit detected.
Fail-safe system
• Able to start engine
• Able to drive vehicle
Procedure
1. Connection of shift sensor 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 shift sensor coupler "1" and ECU coupler "2".
• Open circuit check
9-228
P1806, P1807