Pinpoint Test C: Intake Air Temperature Sensor: Description

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Intake Air Temperature (IAT) sensor is a thermistor-type sensor with a variable resistance that changes when exposed to different temperatures. When interfaced with Powertrain Control Module (PCM), it produces a 0-5 volt analog signal that will measure temperature. IAT sensor's primary function is to measure ambient air temperature in order to determine when Exhaust Back Pressure (EBP) device is required. An IAT signal that is detected out of range (high or low) by PCM will cause engine to ignore IAT signal, disable EBP operation and assume an ambient temperature of 59°F (15°C). DTC 0113 indicates IAT sensor circuit high input. DTC 0112 indicates IAT sensor circuit low input.

This pinpoint test is intended to diagnose the following components and circuits:

Intake Air Temperature (IAT) sensor.
Wiring harness circuits; (IAT and SIG RTN).
Powertrain Control Module (PCM).

Fig 1: Intake Temperature Sensor Circuit Checks & Connector Terminals (1 Of 2)

Courtesy of FORD MOTOR CO.

Fig 2: Intake Temperature Sensor Circuit Checks & Connector Terminals (2 Of 2)

Courtesy of FORD MOTOR CO.