Yamaha YZF-R1 Series Service Manual page 624

EAS20574
P0201
EAS33054
TROUBLESHOOTING
Item
Primary injector #1: malfunction in primary injector #1.
Fail-safe system
• Able to start engine (depending on the number of faulty cylinders)
• Able to drive vehicle (depending on the number of faulty cylinders)
Procedure
1. Connection of primary injector #1 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. Execute the diagnostic mode. (Code D36)
Is it hear operating sound?
YES
→ Go to step 6.
NO
→ Go to step 2.
2. Defective primary injector #1.
• Measure the primary injector resistance.
Refer to "CHECKING THE FUEL INJECTORS" on page 8-51.
Is check result OK?
YES
→ Go to step 3.
NO
a. Replace the primary injector #1.
Refer to "THROTTLE BODIES" on page 7-11.
b. Execute the diagnostic mode. (Code D36)
Is it hear operating sound?
YES
→ Go to step 6.
NO
→ Go to step 3.
3. 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
9-127
P0201