Self-Diagnostic Function And Diagnostic Code Table; Self-Diagnostic Function Table (For Fuel Injection System); Diagnostic Code: Sensor Operation Table - Yamaha YZ450FN 2022 Owner's Service Manual

SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE

EAM20174
SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
EAM30497

SELF-DIAGNOSTIC FUNCTION TABLE (FOR FUEL INJECTION SYSTEM)

Fault code
Crankshaft position sensor: no normal signals are received from the crank-
12
shaft position sensor.
13 Intake air pressure sensor: open or short circuit detected.
Intake air pressure sensor: hose system malfunction (clogged or detached
14
hose).
15 Throttle position sensor: open or short circuit detected.
16 Throttle position sensor: stuck throttle position sensor is detected.
21 Coolant temperature sensor: open or short circuit detected.
22 Intake air temperature sensor: open or short circuit detected.
30 The vehicle has overturned.
Ignition coil: open or short circuit detected in the primary lead of the ignition
33
coil.
39 Injector: open or short circuit detected.
41 ECU: built-in lean angle sensor malfunction.
43 Fuel system voltage: incorrect voltage supplied to the main relay and CCU.
EEPROM fault code number: an error is detected while reading or writing on
44
EEPROM.
46 Vehicle system power supply: normal voltage is not supplied to the ECU.
50 ECU: faulty ECU memory.
70 Engine forcibly stops when the vehicle is left idling for a long period of time.
EAM30425

DIAGNOSTIC CODE: SENSOR OPERATION TABLE

Diag-
nostic
Item
code
No.
01 Throttle angle
• Fully closed position
• Fully opened position
03 Pressure of suction pipe
05 Intake air temperature
Item
Display
Displays the throttle angle.
• 11–14
• 86–92
Displays the intake air pressure.
• Check the change of the
intake pressure valve when
the starter switch is pushed.
Displays the intake air tempera-
ture.
9-12
Page
8-19
8-20
8-22
8-23
8-24
8-25
8-27
8-28
8-29
8-31
8-32
8-32
8-34
8-35
8-36
8-36
Procedure
• Check with throttle fully
closed.
• Check with throttle fully
opened.
The atmospheric pressure is
displayed on the Yamaha
diagnostic tool.
Compare the actually mea-
sured intake air temperature
with the Yamaha diagnostic
tool display value.