Yamaha 2004 YP400 Service Manual page 321

Fault code No. 41
Used diagnostic code No. 08 (lean angle cut-off switch)
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 wiring har-
ness.
3 Defective lean angle cut-off switch
Fault code No. 42
Used diagnostic code No. 07 (speed sensor)
Order Inspection operation item and
probable cause
1 Connected condition of speed sen-
sor 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 speed sen-
sor lead.
3 Defective speed sensor
FUEL INJECTION SYSTEM
Symptom Lean angle cut-off switch open or short circuit is detected.
Operation item and countermeasure
If there is a malfunction, repair it and connect it
securely.
Lean angle cut-off switch coupler
Main wiring harness ECU coupler
Repair or replace if there is an open or short circuit.
Between switch coupler and ECU coupler
black/blue – black/blue
yellow/green – yellow/green
blue – blue
Execute the diagnostic mode (code No. 08)
Replace if defective.
Refer to Fault code No. 30.
Symptom No normal signals are received from the speed sensor.
Operation item and countermeasure
If there is a malfunction, repair it and connect it
securely.
Speed sensor coupler
Main wiring harness ECU coupler
Repair or replace if there is an open or short circuit.
Between sensor coupler and ECU coupler
blue – blue
white – white
black/blue – black/blue
Execute the diagnostic mode (code No. 07)
Replace if defective.
Refer to "SIGNALING SYSTEM" in chapter 8.
7 - 20
FI
Reinstatement
method
Reinstated by turn-
ing the main switch
ON.
Reinstatement
method
Reinstated by
starting the engine,
and inputting the
vehicle speed sig-
nals by operating
the scooter at a low
speed of 20 to
30 km/h.