Yamaha YBR250 2007 Service Manual page 291

Fault
22
code no.
Diagnostic code No.
Item / components and
O rder
probable cause
Connections
• Intake air tem perature
sensor coupler
1
• M ain wire harness ECU
coupler
O pen or short circuit in wire
2
harness
3 O pen circuit in wiring
Defective intake air
4
tem perature sensor
FUEL INJECTION SYSTEM
Intake air tem perature sensor: open or short circuit
Sym ptom
detected.
D05 Intake air tem perature sensor
Check or m aintenance job
• Check the coupler for any pins that m ay
be pulled out.
• Check the locking condition of the
couplers.
• If there is a m alfunction, repair it and
connect the coupler securely.
• Repair or replace if there is an open or
short circuit.
• Between throttle body sensor assem bly
coupler and ECU coupler
Check the wiring continuity between the
ECU and sensor connectors.
Black / Blue - Black / Blue
Brown / W hite - Brown / W hite.
• Execute the diagnostic m ode. (Code no.
D05).
• Replace the throttle body if defective.
1. Connect the pocket tester to the intake
air tem perature sensor term inal, as
shown.
Positive end --> brown/white 1 1 1 1 1
Negative end --> black/blue 2 2 2 2 2
2. M easure the resistance at the intake air
tem perature sensor.
V V V V V W A R N I N G
• Handle the air intake temperature
sensor with special care.
• Do not submit the air intake
temperature sensor to strong
impact. If the sensor fall over,
replace it.
3. Is the intake air tem perature sensor
O K?
6-18
Intake air temperature sensor
resistance
220 ~ 280 Ω Ω Ω Ω Ω (at 20
o
C)
FI
Reinstatem ent
m ethod
Turning the
m ain switch
O N.