INTAKE AIR TEMPERATURE (IAT) SENSOR NO.1 INSPECTION [WL-3]

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Note
•  Perform the following inspection only when directed.

Resistance Inspection

1.  Remove the IAT sensor No.1.

2.  Measure the resistance of the IAT sensor No.1 using an ohmmeter.

•  If not as specified, replace the IAT sensor No.1.
•  If as specified, carry out the “Circuit Open/Short inspection”.

Specification

Ambient temperature (°C {°F})

Resistance (kilohm)
20 {68}
2.21—2.69
80 {176}
0.29—0.354
120 {248}
0.11—0.12

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Circuit Open/Short Inspection

1.  Disconnect the MAF sensor/IAT sensor No.1 connector.

2.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [WL-3].)

3.  Inspect for an open or short circuit in the following wiring harnesses.

•  If there is an open or short circuit, repair or replace wiring harnesses.
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Open circuit
•  Signal circuit (IAT sensor No.1 connector terminal A and PCM connector terminal 1J)
•  Ground circuit (IAT sensor No.1 connector terminal B and PCM connector terminal 1B)
Short circuit
•  IAT sensor No.1 connector terminal A and PCM connector terminal 1J short to ground
•  IAT sensor No.1 connector terminal B and PCM connector terminal 1B short to power supply