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

id0140a1802200

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.

atraaw00000196

•  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)

atraaw00000197

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).

atraaw00001480

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