Yamaha YZFR1W 2007 Service Manual page 368

Fault code No. 19
Diagnostic code No.
Orde Item/components and probable
r cause
1 Connections
• Main wire harness ECU coupler
2 Open or short circuit in wire harness.
3 Defective sidestand switch.
Fault code No. 20
Diagnostic code No.
Orde Item/components and probable
r cause
1 Defective intake air pressure sensor or
atmospheric pressure sensor.
Open circuit is detected in the input line from the side-
Symptom
stand switch to the ECU.
20 Sidestand switch
Check or maintenance job
• Execute the diagnostic mode.
• Check the coupler for any pins
• Check the locking condition of
• If there is a malfunction, repair it
• Repair or replace if there is an
• Between ECU coupler and relay
• Between relay unit coupler and
• Between sidestand switch cou-
• Replace if defective.
When the main switch is turned to "ON", the atmospheric
Symptom pressure sensor voltage and intake air pressure sensor
voltage differ greatly.
03 Intake air pressure sensor
02 Atmospheric pressure sensor
Check or maintenance job
• Execute the diagnostic mode.
• Refer to "CHECKING THE
8-49
FUEL INJECTION SYSTEM
(Code No.20)
that may be pulled out.
the coupler.
and connect the coupler
securely.
open or short circuit.
unit coupler.
(Blue/Yellow–Blue/Yellow)
sidestand switch coupler.
(Blue/Black–Blue/Black)
pler and engine ground.
(Black–Black)
Refer to "CHECKING THE
SWITCHES" on page 8-81.
(Code Nos. 03, 02)
Replace if defective.
INTAKE AIR PRESSURE SEN-
SOR" on page 8-99 or
"CHECKING THE ATMO-
SPHERIC PRESSURE SEN-
SOR" on page 8-98.
Reinstatement
method
If the transmis-
sion is in gear,
retracting the
sidestand.
If the transmis-
sion is in neu-
tral,
reconnecting
the wiring.
Reinstatement
method
Turning the
main switch to
"ON".