YAMAHA YZ250F SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE

12

Crankshaft position sensor: no normal signals are received from the crankshaft position sensor.

Fault code No. 12

13

Intake air pressure sensor: open or short circuit detected.

Fault code No. 13

14

Intake air pressure sensor: hose system malfunction (clogged or detached hose).

Fault code No. 14

15

Throttle position sensor: open or short circuit detected.

Fault code No. 15

16

Throttle position sensor: stuck throttle position sensor is detected.

Fault code No. 16

21

Coolant temperature sensor: open or short circuit detected.

Fault code No. 21

22

Intake air temperature sensor: open or short circuit detected.

Fault code No. 22

30

The vehicle has overturned.

Fault code No. 30

33

Ignition coil: open or short circuit detected in the primary lead of the ignition coil.

Fault code No. 33

39

Injector: open or short circuit detected.

Fault code No. 39

41

ECU: built-in lean angle sensor malfunction.

Fault code No. 41

43

Fuel system voltage: incorrect voltage supplied to the main relay and CCU.

Fault code No. 43

44

EEPROM fault code number: an error is detected while reading or writing on EEPROM.

Fault code No. 44

46

Vehicle system power supply: normal voltage is not supplied to the ECU.

Fault code No. 46

50

ECU: faulty ECU memory.

Fault code No. 50

70

Engine forcibly stops when the vehicle is left idling for a long period of time.

Fault code No. 70

01

Throttle angle

Displays the throttle angle.

03

Pressure of suction pipe

Displays the intake air pressure.

The atmospheric pressure is displayed on the Yamaha diagnostic tool.

05

Intake air temperature

Displays the intake air temperature.

Compare the actually measured intake air temperature with the Yamaha diagnostic tool display value.

06

Coolant temperature

Displays the coolant temperature.

Compare the actually measured coolant temperature with the Yamaha diagnostic tool display value.

08

Lean angle sensor

Displays the output voltage.

Remove the ECU, and incline it 45° or more.

09

Monitor voltage

Displays the voltage of the external battery connected to the Yamaha diagnostic tool.

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21

Neutral switch

Operate the shift pedal.

25

Gear position switch

Operate the shift pedal.

60

EEPROM fault code display

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61

Malfunction history (△) code display *1

—

62

Malfunction history (△) code erasure *1

Replace all (△) with () by the operation start processing.

64

Setting history display

Displays the presence or absence of the setting history by Power Tuner.

—

65

Setting map erasure

Displays the presence or absence of the setting history by Power Tuner.

Erase all setting maps by the operation start processing.

70

Program version number

Displays a program version No.

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30

Ignition coil

Actuates the ignition coil five times at one-second intervals.

“WARNING” on the Yamaha diagnostic tool blinks five times when the ignition coil is actuated.

Check that a spark is generated five times.

36

Injector

Actuates the injector five times at one-second intervals.

“WARNING” on the Yamaha diagnostic tool blinks five times when the injector is actuated.

TIP: Before performing this operation, be sure to disconnect the fuel pump coupler.

Check that injector is actuated five times by listening for the operating sound.