Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0095 03: Intake Air Temperature (IAT) Sensor 2 Circuit Voltage Below ThresholdDTC 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
| • | The ignition is ON, or the engine is operating. |
| • | The DTCs run continuously once the above conditions are met. |
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
| • | If the engine has sat overnight, the IAT sensor and the ECT sensor values should display within 3°C (5°F). |
| • | High resistance on either the IAT sensor signal circuit or the IAT sensor low reference circuit could set a DTC. |
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Circuit/System Verification
Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. DTCs P0095, P0097, or P0098 should not set.
Circuit/System Testing
- Ignition OFF, and the MAIN fuse removed, disconnect the harness connector at the turbocharger pressure sensor.
- Test for less than 5 ohms of resistance between the low reference circuit terminal 4 and ground.
- Install the MAIN fuse. Ignition ON, test for 4.8-5.2 volts between the IAT signal circuit terminal 3 and ground.
- If all circuits/connections test normal, test or replace the turbocharger pressure sensor.
| ⇒ | 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/connections test normal, replace the engine control module (ECM). |
| ⇒ | If less than the specified range, test the signal circuit for an open or a short to ground. If the circuit/connections test normal, replace the ECM. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM. |
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.
| ⇒ | If not within the specified range, replace the turbocharger pressure sensor |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
