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FUEL SYSTEM (DFI) 3-59
Intake Air Temperature Sensor (Service Code 13)
•
Turn the ignition switch off.
If the reading is within the standard, check the ECU for
its ground, and power supply (see ECU Power Supply
Inspection).
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation).
If the reading is out of the standard, remove the ECU
and check the wiring for continuity between main harness
connectors.
Disconnect the ECU and sensor connectors.
Wiring Continuity Inspection
ECU Connector [A] ←→
Intake Air Temperature Sensor Connector [B]
R/BK lead (ECU terminal 16) [C]
G lead (ECU terminal 49) [D]
If the wiring is good, check the intake air temperature sen-
sor resistance (see Intake Air Temperature Sensor Resis-
tance Inspection).
Intake Air Temper
ature Sensor Resistance
Inspection
•
Remove the intake air temperature sensor (see Intake Air
Temperature Sensor Removal/Ins
tallation).
•
Suspend the sensor [A] in a container of machine oil so
that the heat-sensitive portion is submerged.
•
Suspend a thermometer [B] with the heat-sen
sitive por-
tion [C] located in almost the same depth with the sensor.
NOTE
○
The sensor and thermometer must not touch the con-
tainer side or bottom.
•
Place the container over a source of heat and gradually
raise the temperature of the oil while stirring the oil gently
for even temperature.
•
Using a digital meter, measure the internal resistance
of the sensor across the terminals at the temperatures
shown in the following.
Intake Air Temperature Sensor Resistance
Standard: 5.4
∼ 6.6 kΩ at 0°C (32°F)
0.29
∼ 0.39 kΩ at 80°C (176°F)
If the reading is out of the standard, replace the sensor.
If the reading is within the standard, but the problem still
exists, replace the ECU (see ECU Removal/Installation).
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