Yamaha YZF-R1 Series Service Manual page 690

EAS20601
P0657
EAS33081
TROUBLESHOOTING
Item
Fuel system voltage: incorrect voltage supplied to the fuel injector and fuel pump.
Fail-safe system
• Able to start engine
• Able to drive vehicle
Procedure
TIP
If more than one DTC is detected at the same time, perform troubleshooting of DTC listed below first.
• P0335
1. Connection of relay unit 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. Start the engine and let it idle for approximately 5 seconds.
c. Check the condition of the DTC using the malfunction mode of the YDT.
Is it in the "Recovered" condition?
YES
→ Go to step 8, and complete the service.
NO
→ Go to step 2.
2. Connection of handlebar switch (right) 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. Start the engine and let it idle for approximately 5 seconds.
c. Check the condition of the DTC using the malfunction mode of the YDT.
Is it in the "Recovered" condition?
YES
→ Go to step 8, and complete the service.
NO
→ Go to step 3.
3. Connection of ECU coupler.
• Check the locking condition of the coupler.
9-193
P0657