The IAT sensor is a variable resistor that measures the temperature of the air when it first enters the induction system. The engine control module (ECM) supplies 5 V to the IAT signal circuit and a ground for the shared IAT low reference circuit.

The ECM detects that the IAT sensor signal has abruptly changed a minimum of 10°C (18°F) warmer or colder for greater than 2 s.

DTCs P0114 00 is a Type B DTCs.

DTCs P0114 00 is a Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Air Intake System Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. If the ignition has been OFF for 8 h or greater, the IAT, the ambient air temperature, and the engine coolant temperature (ECT) should be within 9°C (16°F) of each other. Ignition ON, observe the scan tool IAT Sensor, Ambient Air Temperature, and the ECT Sensor 1 parameters. Compare those sensor parameters to each other to determine if the condition is current.
2. Drive the vehicle under various operating conditions. Observe the scan tool IAT Sensor parameter and the Ambient Air Temperature parameter. The readings should be near each other.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

1. Ignition OFF for 90 s, disconnect the harness connector at the B66 Intake Air Temperature (IAT) Sensor.
2. Test for less than 5 Ω between the B66 Intake Air Temperature (IAT) Sensor low reference circuit terminal B and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance.

3. Ignition ON, verify the scan tool IAT parameter is colder than -39°C (-38°F).

⇒	If greater than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

⇒	If less than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

4. If all circuits test normal, test or replace the B66 Intake Air Temperature (IAT) Sensor.

Static Test

Measure and record the resistance of the IAT sensor at various ambient air temperatures, then compare those measurements to the Temperature/Resistance table. Refer to Temperature Versus Resistance

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.