Yamaha YZ450FP 2023, Owner'S Service Manual

Page: 330 / 388

FUEL INJECTION SYSTEM
8-31
Fault code No. 33
1 The vehicle has overturned. Raise the vehicle upright. Stand the vehicle upright, start
switch to ON (no need to start
the engine), wait 10 seconds,
and then check the condition of
the fault code using the mal-
function mode of the Yamaha
diagnostic tool.
Condition is “Recovered”

Go
to item 4 and finish the service.
Condition is “Detected”

Go to
item 2.
2 Mounted condition of ECU.
Check for mounted position and
angle.
Check the mounted condition
for correctness.
Improperly mounted ECU

Remount the ECU.
Stand the vehicle upright, start
switch to ON (no need to start
the engine), wait 10 seconds,
and then check the condition of
the fault code using the mal-
function mode of the Yamaha
diagnostic tool.
Condition is “Recovered”

Go
to item 4 and finish the service.
Condition is “Detected”

Go to
item 3.
3 Faulty ECU. Execute the diagnostic mode.
(Code No. 08)
Proper display:
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
Fault code No. 30
Item The vehicle has overturned.