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4·38
FI
SYSTEM
DIAGNOSIS
"C21"
IAT SENSOR CIRCUIT MALFUNCTION
DETECTED CONDITION
POSSIBLE CAUSE
Output voltage low or high • IAT sensor circuit open or short.
0.15
~ Sensor voltage < 4.85 V • IAT sensor malfunction.
(without the above range.)
• ECM malfunction.
INSPECTION
Step
1
1) Lift and support the fuel tank with its prop stay.
(c:::?5-5)
2) Turn the ignition switch OFF.
3) Check the IAT sensor coupler for loose or poor contacts.
If OK, then measure the IAT sensor voltage at the wire side
coupler.
4) Disconnect the coupler and turn the ignition switch ON.
5} Measure
~he
vol~age
between Dg wire
~erminal
and ground.
6) If OK, then measure the voltage between Dg wire terminal
and B/Br wire terminal.
_
IAT
sensor
voltage:
4.5 - 5.5 V
(@ Dg - 8
Ground)
(@ Dg - 8
B/Br)
Ir'OOt!
09900-25008:
Multi
circuit
tester
set
~
Tester
knob
indication:
Voltage
(=-=-:)
Is the voltage OK?
YES Go to Step 2.
• Loose or poor contacts on the ECM coupler.
NO • Open or short circuit in the B/BI wire or B/Br
wire.
BfBr
~/
!
09