Yamaha WR250F 2021 - Page 335

FUEL INJECTION SYSTEM
8-34
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.
3 Wire harness continuity. Open or short circuit  Replace
the wire harness.
Between the crankshaft position
sensor coupler and ECU cou-
pler.
gray–gray
black/blue–black/blue
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.
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.
Improperly mounted sensor 
Remount or replace the sensor.
Refer to “GENERATOR” on
page 5-38.
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.
5 Defective crankshaft position
sensor.
Check the crankshaft position
sensor.
Refer to “CHECKING THE
CRANKSHAFT POSITION
SENSOR” on page 8-66.
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.
6 Faulty ECU. Replace the ECU. Service is finished.
7 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. 13
Item Intake air pressure sensor: open or short circuit detected.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. 03
Diagnostic tool display Displays the intake air pressure.
Procedure The atmospheric pressure is displayed on the Yamaha diagnostic tool.
Item
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service com-
pletion
Fault code No. 12
Item
Crankshaft position sensor: no normal signals are received from
the crankshaft position sensor.