Diagnostic Instructions

DTC Descriptors

DTC P0095 03:  Intake Air Temperature (IAT) Sensor 2 Circuit Voltage Below Threshold

DTC P0095 07:  Intake Air Temperature (IAT) Sensor 2 Circuit Voltage Above Threshold

DTC P0097:  Intake Air Temperature (IAT) Sensor 2 Circuit Low Voltage

DTC P0098:  Intake Air Temperature (IAT) Sensor 2 Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
IAT Sensor Signal	P0095 03, P0097	P0095 07, P0098	P0095 07, P0098*	P0110
Low Reference	--	P0095 07, P0098	P0095 07, P0098*	P0110
* Internal ECM or sensor damage may occur if the circuit is shorted to B+

Circuit Description

The intake air temperature (IAT) sensor 2 is an integral part of the turbocharger pressure sensor. The IAT sensor is a variable resistor that measures the temperature of the intake air. The engine control module (ECM) supplies 5 volts to the IAT signal circuit and supplies a ground to the low reference circuit.

The following table illustrates the difference between temperature, resistance, and voltage:

IAT	IAT Resistance	IAT Signal Voltage
Cold	High	High
Warm	Low	Low

Conditions for Running the DTC

Conditions for Setting the DTC

P0095 03, P0097

The ECM detects that the IAT sensor 2 is less than 160 mV for greater than 0.5 seconds.

P0095 07, P0098

The ECM detects that the IAT sensor 2 parameter is greater than 4.9 volts for greater than 0.5 seconds.

Action Taken When the DTC Sets

DTCs P0095, P0097, and P0098 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0095, P0097, and P0098 are Type B DTCs.

Diagnostic Aids

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition On, observe the DTC information with a scan tool. DTCs P0095, P0097, or P0098 should not set.
2. 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.

Circuit/System Testing

1. Ignition OFF, and the MAIN fuse removed, disconnect the harness connector at the turbocharger pressure sensor.
2. Test for less than 5 ohms of resistance between the low reference circuit terminal 4 and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance, or for a short to voltage. If the circuit tests normal, replace the ECM.

3. Install the MAIN fuse. Ignition ON, test for 4.8-5.2 volts between the IAT signal circuit terminal 3 and ground.

⇒	If less than the specified range, test the signal circuit for an open or a short to ground. If the circuit tests normal, replace the ECM.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. If all circuits test normal, test or replace the turbocharger pressure sensor.

Component Testing

Measure and record the resistance between the IAT signal circuit terminal 3 and the low reference circuit terminal 4 at various ambient temperatures. Compare those measurements to the Temperature Versus Resistance table and verify that the resistance is within 5 percent of the specification.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.