Yamaha XV19SX(C), Service Manual

Page: 437 / 494

FUEL INJECTION SYSTEM
7-46
Fault code No. 19 Symptom A break or disconnection of the blue/black lead of the
ECU is detected.
Diagnostic code No. 20 Sidestand switch
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
1 Connections
• Main wire harness ECU coupler • Execute the diagnostic mode.
(Code No.20)
• Check the coupler for any pins
that may be pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler se-
curely.
If the transmis-
sion is in gear,
retracting the
sidestand.
If the transmis-
sion is in neu-
tral,
reconnecting
the wiring.
2 Open or short circuit in wire harness. • Repair or replace if there is an
open or short circuit.
• Between ECU and blue/black
lead
3 Defective sidestand switch. • Replace if defective.
Refer to “CHECKING THE
SWITCHES” on page 7-71.
Fault code No. 22 Symptom Air temperature sensor: open or short circuit detected.
Diagnostic code No. 05 Air temperature sensor
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
1 Installed condition of air temperature
sensor. Check for looseness or pinching. Turning the
main switch to
“ON”.
2 Connections
• Air temperature sensor coupler
• Main wire harness ECU coupler • Check the coupler for any pins
that may be pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler se-
curely.
3 Open or short circuit in wire harness. • Repair or replace if there is an
open or short circuit.
• Between air temperature sen-
sor coupler and ECU coupler
(brown/white–brown/white)
(black/blue–black/blue)
4 Defective air temperature sensor. • Execute the diagnostic mode.
(Code No.05)
• Replace if defective.
Refer to “CHECKING THE AIR
TEMPERATURE SENSOR” on
page 7-91.