Yamaha 2004 YP400, Service Manual, Page: 319 / 417

7 - 18
FI
FUEL INJECTION SYSTEM
Fault code No. 30 Symptom The scooter has overturned.
Used diagnostic code No. 08 (lean angle cut-off switch)
Order Inspection operation item and
probable cause Operation item and countermeasure Reinstatement
method
1 The scooter has overturned. Raise the scooter upright. Reinstated by turn-
ing the main switch
ON (however, the
engine cannot be
restarted unless
the main switch is
first turned OFF).
2 Installed condition of the lean
angle cut-off switch Check the installed area for looseness or pinching.
3 Connected condition of connector
Inspect the coupler for any pins
that may have pulled out.
Check the locking condition of the
coupler.
If there is a malfunction, repair it and connect it
securely.
Lean angle cut-off switch coupler
Main wiring harness ECU coupler
4 Defective lean angle cut-off switch Execute the diagnostic mode (code No. 08)
Replace if defective.
1. Remove the lean angle cut-off switch from the
scooter.
2. Connect the lean angle cut-off switch coupler to
the wire harness.
3. Connect the pocket tester (DC 20 V) to the lean
angle cut-off switch terminals as shown.
4. When turning the lean angle cut-off switch
approximately 45 °, the voltage reading change
from 0.9 V to 4.1 V.
5. Is the lean angle cut-off switch OK?
Fault code No. 33 Symptom Open circuit detected in the primary lead of the ignition coil.
Used diagnostic code No. 30
Order Inspection operation item and
probable cause Operation item and countermeasure Reinstatement
method
1 Connected condition of connector
Inspect the coupler for any pins
that may have pulled out.
Check the locking condition of the
coupler.
If there is a malfunction, repair it and connect it
securely.
Ignition coil primary side coupler – orange
Main wiring harness ECU coupler
Sub-wire harness coupler
Reinstated by
starting the engine
and operating it at
idle.
2 Open or short circuit in lead. Repair or replace if there is an open or short circuit.
Between ignition coil coupler and ECU coupler/main
harness
orange – orange
3 Defective ignition coil (test the pri-
mary and secondary coils for conti-
nuity). Execute the diagnostic mode (code No. 30)
Replace if defective.
Refer to “IGNITION SYSTEM” in chapter 8.
Positive tester probe
→
blue
1
Negative tester probe
→
yellow/green
2