Yamaha YZF-R1 Series Service Manual page 665

EAS20586
P048D, P048E
EAS33066
TROUBLESHOOTING
Item
• [P048D] EXUP servo motor: open or ground short circuit detected.
• [P048E] EXUP servo motor: power short circuit detected.
Fail-safe system
• Able to start engine
• Able to drive vehicle
Procedure
TIP
If "P048D/P048E" and "P0476" are both indicated, take the actions specified for "P048D/P048E" first.
1. Connection of EXUP servo motor 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. Turn the main switch to "ON", and then check the condition of the DTC using the malfunction mode
of the YDT.
Is it in the "Recovered" condition?
YES
→ Go to step 6, and complete the service.
NO
→ Go to step 2.
2. 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
→ Go to step 3.
NO
a. Connect the coupler securely or replace the wire harness.
b. Turn the main switch to "ON", and then check the condition of the DTC using the malfunction mode
of the YDT.
Is it in the "Recovered" condition?
YES
→ Go to step 6, and complete the service.
NO
→ Go to step 3.
3. Wire harness continuity.
• Disconnect the EXUP servo motor coupler "1" and ECU coupler "2".
9-168
P048D, P048E