Yamaha YZ 2023 Series, Owner'S Service Manual

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SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
9-12
EAM20174
SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
EAM30497
SELF-DIAGNOSTIC FUNCTION TABLE (FOR FUEL INJECTION SYSTEM)
EAM30425
DIAGNOSTIC CODE: SENSOR OPERATION TABLE
Fault code Item Page
12
Crankshaft position sensor: no normal signals are received from the crank-
shaft position sensor.
8-23
13 Intake air pressure sensor: open or short circuit detected. 8-24
14
Intake air pressure sensor: hose system malfunction (clogged or detached
hose).
8-26
15 Throttle position sensor: open or short circuit detected. 8-27
16 Throttle position sensor: stuck throttle position sensor is detected. 8-28
21 Coolant temperature sensor: open or short circuit detected. 8-29
22 Intake air temperature sensor: open or short circuit detected. 8-31
30 The vehicle has overturned. 8-32
33
Ignition coil: open or short circuit detected in the primary lead of the ignition
coil.
8-33
39 Injector: open or short circuit detected. 8-35
41 ECU: built-in lean angle sensor malfunction. 8-36
43 Fuel system voltage: incorrect voltage supplied to the main relay and CCU. 8-36
44
EEPROM fault code number: an error is detected while reading or writing on
EEPROM.
8-38
46 Vehicle system power supply: normal voltage is not supplied to the ECU. 8-39
50 ECU: faulty ECU memory. 8-40
70 Engine forcibly stops when the vehicle is left idling for a long period of time. 8-40
Diag-
nostic
code
No.
Item Display Procedure
01 Throttle angle Displays the throttle angle.
• Fully closed position • 11–14 • Check with throttle fully
closed.
• Fully opened position • 86–92 • Check with throttle fully
opened.
03 Pressure of suction pipe Displays the intake air pressure.
• Check the change of the
intake pressure valve when
the starter switch is pushed.
The atmospheric pressure is
displayed on the Yamaha
diagnostic tool.
05 Intake air temperature Displays the intake air tempera-
ture.
Compare the actually mea-
sured intake air temperature
with the Yamaha diagnostic
tool display value.