Yamaha MT-03 Service Manual page 316

Fault code No. 13
Used diagnostic code No. 03 (intake air pressure sensor)
Order Item/components
1 Coupler connections
Intake air pressure sensor coupler
ECU coupler
Sub-wire harness coupler
2 Open or short circuit in the wire har-
ness
3 Defective intake air pressure sen-
sor
Symptom Open or short circuit is detected from the intake air pressure sensor.
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 wire harnesses.
Black/Blue - Black/Blue
Pink/White - Pink/White
Blue - Blue
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.
• Positive tester probe
• Negative tester probe
2. Set the main switch to "ON".
3. Measure the intake air pressure sensor output
voltage.
4. Is the intake air pressure sensor OK?
FUEL INJECTION SYSTEM
Pink/White "1"
Black/Blue "2"
2
1
L P/W B/L
Intake air pressure sensor out-
put voltage
3.4 ~ 3.8 V
7-29
Restore method
Reinstated by crank-
ing the engine.