Yamaha XT660R, Service Manual

Page: 356 / 462

7 - 13
FI
FUEL INJECTION SYSTEM
Fault code No. 13 Symptom Open or short circuit is detected from the intake air pressure sensor.
Used diagnostic code No. 03 (intake air pressure sensor)
Order Item/components Check or maintenance job Restore method
1 Coupler connections
Intake air pressure sensor coupler
ECU coupler
Sub-wire harness 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.
Reinstated by crank-
ing the engine.
2 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
Pink/White - Pink/White
Blue - Blue
3 Defective intake air pressure sen-
sor Execute the diagnostic mode. (Code No. 03)
Replace the sensor if it is defective.
1. Connect the pocket tester (DC 20 V) to the
intake air pressure sensor coupler (wire har-
ness end) as shown.
2. Set the main switch to “ON”.
3. Measure the intake air pressure sensor output
voltage.
4. Is the intake air pressure sensor OK?
Positive tester probe
→
pink/white 1
Negative tester probe
→
black/blue
2
L B / L P / W
1 2
Intake air pressure sensor out-
put voltage
3.4 ~ 3.8 V