FUEL INJECTION SYSTEM
8-50
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 Connection
• 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 8-83.
Fault code No. 21 Symptom Coolant temperature sensor: open or short circuit detect-
ed.
Diagnostic code No. 06 Coolant temperature sensor
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
1 Installed condition of coolant tempera-
ture sensor.
Check for looseness or pinching. Turning the
main switch to
“ON”.
2 Connections
• Coolant temperature sensor coupler
• 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
coolant temperature sensor
coupler and ECU coupler.
(black/blue–black/blue)
(green/white–green/white)
4 Defective coolant temperature sensor. • Execute the diagnostic mode.
(Code No. 06)
• Replace if defective.
Refer to “CHECKING THE
COOLANT TEMPERATURE
SENSOR” on page 8-100.
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