Yamaha YZF-R1 Series Service Manual page 733

EAS20639
P21D1
EAS33119
TROUBLESHOOTING
Item
Secondary injector #3: malfunction in secondary injector #3.
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 secondary injector #3 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 D42)
Is it hear operating sound?
YES
→ Go to step 6.
NO
→ Go to step 2.
2. Defective secondary injector #3.
• Measure the secondary 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 secondary injector #3.
Refer to "AIR FILTER CASE" on page 7-5.
b. Execute the diagnostic mode. (Code D42)
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
9-236
P21D1