Yamaha XF50W Service Manual page 258

Fault code No. 14
Used diagnostic code No. D03 (intake air pressure sensor)
Inspection operation item and
Order
probable cause
1 1 Connected state of connector
Intake air pressure sensor cou-
pler
Main wirring harness ECU cou-
pler
Sub-wire harness coupler
2 2 Defective intake air pressure
sensor.
Fault code No. 15
Used diagnostic code No. D01 (throttle position sensor)
Inspection operation item and
Order
probable cause
1 1 1 1
Installed condition of throttle
position sensor.
2 2 2 2
Connected condition of con-
nector
Inspect the coupler for any
pins that may have pulled
out.
Check the locking condition
of the coupler.
3 3 3 3
Open or short circuit in wiring
harness and/or sub lead.
4 4 4 4 Defective throttle position sen-
sor.
FUEL INJECTION SYSTEM
Intake air pressure sensor-hose system malfunction
Symptom
Operation item and countermeasure
Check the coupler for any pins that may have
pulled out.
Check that the coupler is connected securely.
If there is a malfunction, repair it and connect
it securely.
Execute the diagnostic mode (code No. D03)
Replace the throttle body.
NOTE:
Do not remove the sensor assembly (MAQS).
Refer to "Fault code No. 13".
Symptom Throttle position sensor-open or short circuit detected.
Operation item and countermeasure
Check the installed area for looseness or
pinching.
Check that it is installed in the specified po-
sition.
Refer to "THROTTLE BODY AND FUEL IN-
JECTOR".
If there is a malfunction, repair it and connect
it securely.
Throttle position sensor coupler
Main wiring harness ECU coupler
Sub-wire harness coupler
Repair or replace if there is an open or short
circuit.
Between sensor coupler and ECU coupler
black/blue - black/blue
yellow - yellow
blue -blue
Execute the diagnostic mode (code No. D01)
Replace the throttle body.
NOTE:
Do not remove the sensor assembly (MAQS).
Refer to "THROTTLE BODY AND FUEL IN-
JECTOR ".
(clogged or detached hose).
tached hose).
7-15
FI ifl
Reinstatement
method
Reinstated by start- Reinstated by start-
ing the engine and ing the engine and
operating it at idle. operating it at idle.
Reinstatement
method
Reinstated by turn- Reinstated by turn- Reinstated by turn- Reinstated by turn-
ing the main switch ing the main switch ing the main switch ing the main switch
ON. ON. ON. ON.