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SEF258X
SEF012P
Component Description
NHEC0064
The intake air temperature sensor is mounted to the air duct hous-
ing. The sensor detects intake air temperature and transmits a sig-
nal to the ECM.
The temperature sensing unit uses a thermistor which is sensitive
to the change in temperature. Electrical resistance of the thermistor
decreases in response to the temperature rise.
<Reference data>
Intake air
temperature °C (°F)
Voltage* V Resistance kΩ
20 (68) 3.5 2.1 - 2.9
80 (176) 1.23 0.27 - 0.38
*: These data are reference values and are measured between ECM terminal 64
(Intake air temperature sensor) and body ground.
CAUTION:
Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM’s
transistor. Use a ground other than ECM terminals, such as
the ground.
On Board Diagnosis Logic
NHEC0065
Malfunction is detected when
(Malfunction A) an excessively low or high voltage from the sen-
sor is sent to ECM,
(Malfunction B) rationally incorrect voltage from the sensor is sent
to ECM, compared with the voltage signal from engine coolant
temperature sensor.
Possible Cause
NHEC0428
I Harness or connectors
(The sensor circuit is open or shorted.)
I Intake air temperature sensor
DTC Confirmation Procedure
NHEC0066
Perform “PROCEDURE FOR MALFUNCTION A” first. If 1st trip
DTC cannot be confirmed, perform “PROCEDURE FOR MAL-
FUNCTION B”.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
DTC P0110 INTAKE AIR TEMPERATURE SENSOR
Component Description
EC-166
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