Yamaha XV19SX(C) Service Manual page 425

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