Troubleshooting - Yamaha YZF-R1(B) 2012 Service Manual

EAS27150

TROUBLESHOOTING

The ignition system fails to operate (no spark or intermittent spark).
TIP
• Before troubleshooting, remove the following part(s):
1. Rider seat
2. Passenger seat
3. Air filter case duct
4. Side cowlings
1. Check the fuses.
(Main and ignition)
Refer to "CHECKING THE FUSES"
on page 8-129.
OK↓
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-129.
OK↓
3. Check the spark plugs.
Refer to "CHECKING THE SPARK
PLUGS" on page 3-4.
OK↓
4. Check the ignition spark gap.
Refer to "CHECKING THE IGNI-
TION COILS" on page 8-136.
OK↓
5. Check the ignition coils.
Refer to "CHECKING THE IGNI-
TION COILS" on page 8-136.
OK↓
6. Check the crankshaft position sen-
sor.
Refer to "CHECKING THE
CRANKSHAFT POSITION SEN-
SOR" on page 8-137.
OK↓
7. Check the cylinder identification
sensor.
Refer to "CHECKING THE CYLIN-
DER IDENTIFICATION SENSOR"
on page 8-145.
OK↓
NG→
Replace the fuse(s).
NG→
• Clean the battery terminals.
• Recharge or replace the battery.
NG→
Re-gap or replace the spark plugs.
NG→
Ignition system is OK.
NG→
Replace the ignition coils.
NG→
Replace the crankshaft position sen-
sor.
NG→
Replace the cylinder identification
sensor.
8-5
IGNITION SYSTEM