INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION[L3]

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Resistance Inspection

Note
•  Perform the following inspection only when directed.

1.  Disconnect MAF/IAT sensor.

2.  Measure the resistance between the MAF/IAT sensor terminals D and E using an ohmmeter.

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•  If not as specified, replace the MAF/IAT sensor.
•  If the MAF/IAT sensor is okay, but the IAT PID are out of specification, perform the “Circuit Open/Short Inspection”.

Specification

Ambient temperature (°C {°F})

Resistance (kilohm)
–20 {–4}
13.6—18.4
20 {68}
2.21—2.69
60 {140}
0.493—0.667


Circuit Open/Short Inspection

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1.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION[L3].)

2.  Inspect the following wiring harnesses for open or short. (Continuity check)


Open circuit

•  If there is no continuity, the circuit is open. Repair or replace the harness.
―  MAF/IAT sensor terminal D and PCM terminal 1AH
―  MAF/IAT sensor terminal E and PCM terminal 1AE


Short circuit

•  If there is continuity, the circuit is shorted. Repair or replace the harness.
―  MAF/IAT sensor terminal E and power supply
―  MAF/IAT sensor terminal D and power supply
―  MAF/IAT sensor terminal D and body ground