Yamaha YZF-R1 Series Service Manual page 656

Is resistance ∞ Ω?
YES
→ Go to step 4.
NO
a. 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 7, and complete the service.
NO
→ Go to step 4.
4. Installed condition of cylinder-#4 ignition coil.
• Check for looseness or pinching.
Is check result OK?
YES
→ Go to step 5.
NO
a. Reinstall or replace the ignition coil.
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 7, and complete the service.
NO
→ Go to step 5.
5. Defective cylinder-#4 ignition coil.
• Measure the primary coil resistance of the cylinder-#4 ignition coil.
Refer to "CHECKING THE IGNITION COILS" on page 8-44.
Is check result OK?
YES
→ Go to step 6.
NO
a. Replace the cylinder-#4 ignition coil.
Refer to "CAMSHAFTS" on page 5-18.
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 7, and complete the service.
NO
→ Go to step 6.
6. Malfunction in ECU.
• Execute the diagnostic mode. (Code D33)
• Confirm that spark plug does not sparking.
9-159
P0354