Yamaha XT660R S Service Manual page 358

Fault code No. 14
Used diagnostic code No. 03 (intake air pressure sensor)
Order Item/components
1 Disconnected, clogged, kinked, or
pinched intake air pressure sensor
hose
Intake air pressure sensor malfunc-
tion at intermediate electrical poten-
tial
2 Coupler connections
Intake air pressure sensor coupler
ECU coupler
3 Defective intake air pressure sen-
sor
Fault code No. 15
Used diagnostic code No. 01 (throttle position sensor)
Order Item/components
1 Throttle position sensor installation
2 Coupler connections
Throttle position sensor coupler
ECU coupler
3 Open or short circuit in the wire har-
ness
4 Check the throttle position sensor
lead open circuit output voltage.
5 Defective throttle position sensor
FUEL INJECTION SYSTEM
Symptom Intake air pressure sensor hose is disconnected or clogged.
Check or maintenance job
Repair or replace the hose.
Check and repair the connection.
Replace the sensor if there is a malfunction.
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.
Execute the diagnostic mode. (Code No. 03)
Replace the sensor if it is defective.
Refer to "Fault code No. 13".
Symptom Open or short circuit is detected from the throttle position senor.
Check or maintenance job
Check the sensor for looseness or pinching.
Check that the sensor is installed in the specified
position.
Check the connections of the couplers.
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
Yellow - Yellow
Blue - Blue
Check for an open circuit and replace the throttle
position sensor, if necessary.
Black/Blue - Yellow
Open circuit item
Ground wire open cir-
cuit
Output wire open circuit 0 V
Power supply wire
open circuit
Execute the diagnostic mode. (Code No. 01)
Replace the sensor if it is defective.
Refer to "THROTTLE BODY ASSEMBLY".
http://manuals.magnamaniac.com
Output voltage
5 V
0 V
7 - 14
FI
Restore method
Reinstated by start-
ing the engine and
operating it at idle.
Restore method
Reinstated by set-
ting the main switch
to "ON".