Yamaha Grizzly550 User Manual page 374

6. Verify the operation of the sensor or actuator.
• Sensor operation
The data representing the operating conditions of the sensor appears on the multifunction meter.
• Actuator operation
Set the engine stop switch to "ON" to operate the actuator.
TIP
If the engine stop switch is set to "ON", set it to "OFF", and then set it to "ON" again.
7. Turn the main switch to "OFF" to cancel the diagnostic mode.
TIP
To perform a reliable diagnosis, make sure to turn off the power supply before every check and then
start right from the beginning.
Diagnostic code table
Fault
code Symptom
No.
No normal signals are re-
12 ceived from the crankshaft
position sensor.
Intake air pressure sensor:
13 open or short circuit detect-
ed.
Intake air pressure sensor:
hose line malfunction
14
(clogged or detached
hose).
Throttle position sensor:
15 open or short circuit detect-
ed.
Stuck throttle position sen-
16
sor detected.
Coolant temperature sen-
21 sor: open or short circuit
detected.
"d01 d70"
"d70 d01"
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 intake air pressure sensor.
• Malfunction in ECU.
• Intake air pressure sensor hose is de-
tached, clogged, kinked, or pinched.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Defective throttle position sensor.
• Malfunction in ECU.
• Improperly installed throttle position sensor.
• Stuck throttle position sensor.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Defective coolant temperature sensor.
• Malfunction in ECU.
• Improperly installed coolant temperature
sensor.
9-37
FUEL INJECTION SYSTEM
Diagnostic
code No.
—
d03
d03
d01
d01
d06