Yamaha WR250F 2021

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FUEL INJECTION SYSTEM

8-43

Fault code No. 33

3 Faulty ECU. Execute the diagnostic mode.

(Code No. 08)

When the vehicle is upright:

0.4–1.4 (V)

When the vehicle is overturned:

3.7–4.4 (V)

Improper display  Replace the

ECU.

Service is finished.

4 Delete the fault code. Confirm that the fault code has

a condition of “Recovered”

using the Yamaha diagnostic

tool, and then delete the fault

code.

Fault code No. 33

Item

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

the ignition coil.

Fail-safe system

Unable to start engine

Unable to drive vehicle

Diagnostic code No. 30

Actuation

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.

Procedure

Check that a spark is generated five times.

• Connect an ignition checker.

Item

Probable cause of malfunc-

tion and check

Maintenance job

Confirmation of service com-

pletion

1 Connection of ignition coil cou-

pler.

Check the locking condition of

the coupler.

Disconnect the coupler, and

check the pins (for bent or bro-

ken terminals and locking condi-

tion of the pins).

Improperly connected  Con-

nect the coupler securely, or

repair/replace the wire harness.

Start the engine and let it idle for

approximately 5 seconds.

Check the condition of the fault

code using the malfunction

mode of the Yamaha diagnostic

tool.

Condition is “Recovered”  Go

to item 8 and finish the service.

Condition is “Detected”  Go to

item 2.

2 Connection of wire harness

ECU coupler.