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Step
2 2
1) Turn the ignition switch OFF.
2) Measure the IAT sensor resistance.
_
IAT
sensor
resistance:
Approx.
2.2 - 2.7 kO at
20°C
(68
OF)
(Terminal
-
Terminal)
,root,
09900-25008:
Multi
circuit
tester
set
~
Tester
knob
indication:
Resistance
(0)
Is the resistance OK?
•
Dg or B/Br wire open or shorted to ground, or
poor ® or
~
connection.
•
If wire and connection are OK, intermittent trou-
YES
ble or faulty ECM.
•
Recheck each terminal and wire harness for
open circuit and poor connection.
NO Replace the IAT sensor with a new one.
Intake
Air
Temp
Resistance
20°C
(68
OF)
Approx. 2.45 kQ
50°C
(122
OF)
Approx. 0.808 kQ
80°C
(176
OF)
Approx. 0.322 kQ
110°C
(230
OF)
Approx. 0.148 kQ
NOTE:
fAT sensorresistance measurement method is the same way as
that of the
ECT
sensor. Refer to page 7-8 for details.
FI
SYSTEM
DIAGNOSIS
4-39
ECM couplers