Yamaha XT660R S Service Manual page 359

Fault code No. 16
Used diagnostic code No. 01 (throttle position sensor)
Order Item/components
1 Defective throttle position sensor
2 Throttle position sensor installation
Fault code No. 19
Used diagnostic code No. 20 (sidestand switch)
Order Item/components
1 Coupler connections
ECU coupler
Blue/Black connector
2 Open or short circuit in the wire har-
ness
3 Defective sidestand switch
Fault code No. 21
Used diagnostic code No. 06 (coolant temperature sensor)
Order Item/components
1 Coolant temperature sensor instal-
lation
2 Coupler connections
Coolant temperature sensor cou-
pler
ECU coupler
3 Open or short circuit in the wire har-
ness
4 Defective coolant temperature sen-
sor
FUEL INJECTION SYSTEM
Symptom The throttle position sensor is detected stuck.
Check or maintenance job
Replace the sensor if it is defective.
Refer to "THROTTLE BODY ASSEMBLY".
Execute the diagnostic mode. (Code No. 01)
Check the sensor for looseness or pinching.
Check that the sensor is installed in the specified
position. Refer to "THROTTLE BODY ASSEM-
BLY".
Symptom Open circuit is detected in the input wire from the sidestand switch to the ECU.
Check or maintenance job
Check the couplers for any pins that may have
pulled out.
Check that the couplers are securely locked.
If necessary, repair the coupler or securely con-
nect it.
Repair or replace if there is an open or short cir-
cuit between the ECU and sidestand switch.
Blue/Black
Execute the diagnostic mode. (Code No. 20)
Replace the switch if it is defective.
Refer to "CHECKING THE SWITCHES" in chap-
ter 8.
Symptom Open or short circuit is detected from the coolant temperature sensor.
Check or maintenance job
Check the sensor for looseness or pinching.
Check the coupler for any pins that may have
pulled out.
Check that the couplers are securely locked.
If necessary, repair the coupler or securely con-
nect it.
Repair or replace if there is an open or short cir-
cuit between the wire harnesses.
Black/Blue - Black/Blue
Green/Red - Green/Red
Execute the diagnostic mode. (Code No. 06)
Replace the sensor if it is defective.
Refer to "COOLING SYSTEM" in chapter 8.
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FI
Restore method
Reinstated by start-
ing the engine, oper-
ating it at idle, and
then racing it.
Restore method
If the transmission is
in gear, it is rein-
stated by retracting
the sidestand.
If the transmission is
in neutral, it is rein-
stated by reconnect-
ing the wiring.
Restore method
Reinstated by set-
ting the main switch
to "ON'.