Yamaha YZ 2019 Series, Owner'S Service Manual

Page: 333 / 398

FUEL INJECTION SYSTEM
8-34
Fault code No. 33
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 (bent or broken
terminals and locking condition
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.
Fault code number is not dis-
played

Service is finished.
Fault code number is displayed

Go to item 2.
2 Connection of wire harness
ECU coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
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.
Fault code number is not dis-
played

Service is finished.
Fault code number is displayed

Go to item 3.
3 Connection of sub wire harness
coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
Improperly connected

Con-
nect the coupler securely or
repair/replace the sub wire har-
ness.
Start the engine and let it idle for
approximately 5 seconds.
Fault code number is not dis-
played

Service is finished.
Fault code number is displayed

Go to item 4.
4 Wire harness continuity. Open or short circuit

Replace
the wire harness.
Between ignition coil coupler
and ECU coupler.
orange–orange
Start the engine and let it idle for
approximately 5 seconds.
Fault code number is not dis-
played

Service is finished.
Fault code number is displayed

Go to item 5.
5 Installed condition of ignition
coil.
Check for looseness or pinch-
ing.
Improperly installed sensor

Reinstall or replace the sensor.
Start the engine and let it idle for
approximately 5 seconds.
Fault code number is not dis-
played

Service is finished.
Fault code number is displayed

Go to item 6.
6 Defective ignition coil. (test the
primary coils for continuity)
Check the ignition coil.
Replace if defective.
Refer to “CHECKING THE
IGNITION COIL” on page 8-62.
Start the engine and let it idle for
approximately 5 seconds.
Fault code number is not dis-
played

Service is finished.
Fault code number is displayed

Go to item 7.