Yamaha XF50W Service Manual page 261

Fault code No. 22
Used diagnostic code No. D05 (intake air temperature sensor)
Inspection operation item and
Order
probable cause
1 Installed condition of sensor
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 Open or short circuit in wireing
harness and/or sub lead.
4 Defective intake air tempera-
ture sensor.
FUEL INJECTION SYSTEM
Symptom Intake temperature sensor open or short circuit is detected.
Operation item and countermeasure
Check the installed area for looseness or
pinching.
If there is a malfunction, repair it and connect
it securely.
Intake air temperature 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
brown/white - brown/white
Execute the diagnostic mode (code No. D05)
Replace the throttle body.
NOTE:
Do not remove the sensor assembly (MAQS).
1. Connect the digital circuit tester to the in-
take air temperature sensor terminal as
shown.
Positive tester probe
Negative tester probe
2. Measure the intake air temperature sensor
resistance.
n„
w
8 Handle the intake air temperature sen-
sor with special care.
8 Never subject the intake air temperature
sensor to strong shocks. If the intake air
temperature sensor is dropped, replace
it.
3. Is the intake air temperature sensor OK?
-» brown/white 1
-» black/blue 2
Intake air temperature sensor resis-
tance
2.4~2.9k at 20°C (68°F)
7-18
FI ifl
Reinstatement
method
Reinstated by turn-
ing the main switch
ON.