Yamaha YP400T Service Manual page 308

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