Yamaha YZ 2019 Series, Owner'S Service Manual

Page: 335 / 398

FUEL INJECTION SYSTEM
8-36
Fault code No. 41
TIP
Before troubleshooting, disconnect the starter motor lead from the starter relay.
6 Delete the fault code. — Start the engine and let it idle for
approximately 5 seconds.
Check that the fault code num-
ber is not displayed.
Fault code No. 41
Item Lean angle sensor: open or short circuit detected.
Fail-safe system
Unable to start engine
Able to drive vehicle
Diagnostic code No.
08
Diagnostic tool display
Lean angle sensor output voltage
•
0.4–1.4 (upright)
•
3.7–4.4 (overturned)
Procedure
Remove the lean angle sensor and incline it more than 45 degrees.
Item
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service com-
pletion
1 Connection of lean angle sen-
sor 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.
Push the start switch.
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.
Push the start switch.
Fault code number is not dis-
played

Service is finished.
Fault code number is displayed

Go to item 3.
3 Wire harness continuity. Open or short circuit

Replace
the wire harness.
Between lean angle sensor cou-
pler and ECU coupler.
blue–blue
yellow/green–yellow/green
black/blue–black/blue
Push the start switch.
Fault code number is not dis-
played

Service is finished.
Fault code number is displayed

Go to item 4.
4 Defective lean angle sensor. Execute the diagnostic mode.
(Code No. 08)
Replace if defective.
Refer to “CHECKING THE
LEAN ANGLE SENSOR” on
page 8-63.
Push the start switch.
Fault code number is not dis-
played

Service is finished.
Fault code number is displayed

Go to item 5.
5 Malfunction in ECU. Replace the ECU.
Fault code No. 39
Item Injector: open or short circuit detected.