Yamaha MT-09 2021 - P0458; Troubleshooting

9-167
P0458
EAS20785
P0458
EAS33528
TROUBLESHOOTING
Item
Purge cut valve solenoid: open circuit detected.
Fail-safe system
• Able to start engine
• Able to drive vehicle
Procedure
1. Connection of purge cut valve solenoid 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).
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).
3. Wire harness continuity.
• Disconnect the ignition fuse 1 “1”, purge cut valve solenoid coupler “2”, ECM coupler “3” and main
switch coupler “4”.
• Open circuit check
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.
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.