Yamaha YZ 2016 Series Owner's Service Manual page 330

Fault code No.
Item
5 Defective intake air pressure
sensor.
6 Malfunction in ECU.
TIP
• If fault code Nos. 13 and 14 are both displayed, perform the checks and maintenance jobs for fault
code No. 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
1 The intake air pressure sen-
sor hose is damaged, discon-
nected, clogged, twisted or
bent.
13
Intake air pressure sensor: open or short circuit detected.
Execute the diagnostic mode.
(Code No. 03)
When engine is stopped:
Atmospheric pressure at the
current altitude and weather
conditions is indicated.
At sea level: Approx. 101 kPa
1000 m above sea level: Ap-
prox. 90 kPa
2000 m above sea level: Ap-
prox. 80 kPa
3000 m above sea level: Ap-
prox. 70 kPa
When engine is cranking:
Make sure that the indication
value changes.
The value does not change
when engine is cranking. 
Check the intake air pressure
sensor.
Replace if defective.
Refer to "CHECKING THE
INTAKE AIR PRESSURE
SENSOR" on page 8-67.
Replace the ECU.
14
Intake air pressure sensor: hose system malfunction (clogged
or detached hose).
Able to start engine
Able to drive vehicle
03
Displays the intake air pressure.
Operate the throttle while pushing the start switch.(If the display
value changes, the performance is OK.)
Maintenance job
Repair or replace the sensor
hose.
8-28
FUEL INJECTION SYSTEM
Push the start switch.
Fault code number is not dis-
played  Service is finished.
Fault code number is dis-
played  Go to item 6.
Confirmation of service
completion
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 dis-
played  Go to item 2.