Yamaha XT660R, Service Manual

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