Yamaha YZ450FN 2022 Owner's Service Manual page 301

Fault code No.
Item
3 Wire harness continuity.
4 Mounted condition of crankshaft
position sensor.
Check for looseness or pinch-
ing.
Check the gap (0.85 mm
(0.0335 in)) between the crank-
shaft position sensor and the
pickup rotor.
5 Defective crankshaft position
sensor.
6 Faulty ECU.
7 Delete the fault code.
Fault code No. 13
TIP
• If fault code numbers 13 and 14 are both displayed, perform checkup and repair jobs for fault code
number 13 first.
• Before troubleshooting, disconnect the starter motor lead from the starter relay.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Diagnostic tool display
Procedure
Probable cause of malfunc-
Item
tion and check
12
Crankshaft position sensor: no normal signals are received from
the crankshaft position sensor.
Open or short circuit  Replace
the wire harness.
Between the crankshaft position
sensor coupler and ECU cou-
pler.
gray–gray
black/blue–black/blue
Improperly mounted sensor 
Remount or replace the sensor.
Refer to "GENERATOR" on
page 5-37.
Check the crankshaft position
sensor.
Refer to "CHECKING THE
CRANKSHAFT POSITION
SENSOR" on page 8-49.
Replace the ECU.
Confirm that the fault code has
a condition of "Recovered"
using the Yamaha diagnostic
tool, and then delete the fault
code.
13
Intake air pressure sensor: open or short circuit detected.
Able to start engine
Able to drive vehicle
03
Displays the intake air pressure.
The atmospheric pressure is displayed on the Yamaha diagnostic tool.
Maintenance job
8-20
FUEL INJECTION SYSTEM
Crank the engine, and then
check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered"  Go
to item 7 and finish the service.
Condition is "Detected"  Go to
item 4.
Crank the engine, and then
check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered"  Go
to item 7 and finish the service.
Condition is "Detected"  Go to
item 5.
Crank the engine, and then
check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered"  Go
to item 7 and finish the service.
Condition is "Detected"  Go to
item 6.
Service is finished.
Confirmation of service com-
pletion