Yamaha XV19SX(C), Service Manual, Page: 425 / 494

FUEL INJECTION SYSTEM
7-34
7. Verify the operation of the sensor or actuator.
• Sensor operation
The data representing the operating conditions of the sensor appears on the odometer/trip meter/fu-
el reserve trip meter/clock LCD.
• Actuator operation
Set the engine stop switch to “ ” to operate the actuator.
NOTE:
If the engine stop switch is set to “ ”, set it to “ ”, and then set it to “ ” again.
8. Turn the main switch to “OFF” to cancel the diagnostic mode.
Diagnostic code table
d01” “d01 d70” “d70
Fault
code
No.
Symptom Probable cause of malfunction
Diagnostic
code No.
12
No normal signals are re-
ceived from the crankshaft
position sensor.
• Open or short circuit in wire harness.
• Defective crankshaft position sensor.
• Malfunction in crankshaft position sensor
rotor.
• Malfunction in ECU.
• Improperly installed sensor.
—
13
Cylinder-#1 intake air pres-
sure sensor: open or short
circuit detected.
• Open or short circuit in wire harness.
• Defective cylinder-#1 intake air pressure
sensor.
• Malfunction in ECU.
03
14
Cylinder-#1 intake air pres-
sure sensor: hose system
malfunction (clogged or de-
tached hose).
• Cylinder-#1 intake air pressure sensor hose
is detached, clogged, kinked, or pinched.
• Malfunction in ECU.
03
15
Throttle position sensor:
open or short circuit detect-
ed.
• Open or short circuit in wire sub lead.
• Open or short circuit in wire harness.
• Defective throttle position sensor.
• Malfunction in ECU.
• Improperly installed throttle position sensor.
01
17
EXUP servo motor circuit:
open or short circuit detect-
ed. • Open or short circuit in wire harness.
• Defective EXUP servo motor (potentiome-
ter circuit).
53
18 EXUP servo motor is stuck.
• Open or short circuit in wire harness.
• Stuck EXUP servo motor (mechanism).
• Stuck EXUP servo motor (motor).
53