INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION[AJ (3.0L Duratec)]


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Note
•  Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. (See HOW TO USE THIS MANUAL.)

Resistance Inspection

1.  Disconnect the MAF/IAT sensor connector.

2.  Measure the resistance between MAF/IAT sensor terminals A and F.

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•  If not within the specification, replace the MAF/IAT sensor. (See MASS AIR FLOW (MAF) SENSOR REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)
•  If the monitor item status/specification (reference) is not within the specification, even though the resistance is within the specification, perform the “Circuit Open/Short Inspection”.

IAT sensor resistance

IAT (°C {°F})

Resistance (kilohm)

10 {50}
Approx. 58.75
20 {68}
Approx. 37.30
30 {86}
Approx. 24.27
60 {140}
Approx. 7.70

IAT sensor characteristics graph (reference)

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Circuit Open/Short Inspection

1.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)

2.  Inspect the following wiring harness for open or short (continuity check).

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Open circuit

•  If there is no continuity, the circuit is open. Repair or replace the harness.
―  IAT sensor terminal A and PCM terminal 91
―  IAT sensor terminal F and PCM terminal 39


Short circuit

•  If there is continuity, the circuit is shorted. Repair or replace the harness.
―  IAT sensor terminal A and power supply
―  IAT sensor terminal F and body ground
―  IAT sensor terminal F and power supply