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 Descriptor
DTC P0096: Intake Air Temperature (IAT) Sensor 2 PerformanceDiagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
IAT Sensor 2 Signal | P0097 | P0096 | P0098 | P0098 | P0096 |
Low Reference | -- | P0096 | P0098 | -- | P0096 |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage |
|---|---|---|---|---|
IAT Sensor Signal | P0112 | P0113 | P0113 | P0113 |
Low Reference | -- | P0113 | P0113 | P0113 |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Key ON, engine OFF Parameter Normal Range: Varies between -39 to +120°C (-38 to +248°F) | |||
IAT Sensor 2 Signal | 150°C (300°F) | -40°C (-40°F) | -40°C (-40°F) |
Low Reference | -- | -40°C (-40°F) | -40°C (-40°F) |
Circuit | Short to Ground | Open or High Resistance | Short to Voltage |
|---|---|---|---|
Parameter Normal Range: Varies between -39 to +120°C (-38 to +248°F) | |||
IAT Sensor 1 Signal | 140°C (284°F) | -40°C (-40°F) | -40°C (-40°F) |
Low Reference | -- | -40°C (-40°F) | -40°C (-40°F) |
Circuit/System Description
The intake air temperature (IAT) sensor 2 is a variable resistor. The IAT sensor 2 measures the temperature of the air at the engine intake manifold. The engine control module (ECM) supplies 5 volts to the IAT sensor 2 signal circuit, and a ground for the IAT sensor 2 low reference circuit. When the IAT sensor 2 is cold, the sensor resistance is high. When the intake manifold air temperature increases, the sensor resistance decreases. With high sensor resistance, the ECM detects a high voltage on the IAT sensor 2 signal circuit. With lower sensor resistance, the ECM detects a lower voltage on the IAT sensor 2 signal circuit. The ECM monitors the IAT sensor 2 and the IAT sensor signal voltages for a voltage that is not within a calibrated range of each other.
Conditions for Running the DTC
| • | DTCs P0097, P0098, P0112, P0113, P0116, P0117, P0118, P0128, P0500, P0502, P0603 are not set. |
| • | DTC P0116 has run and passed. |
| • | The engine has been OFF for more than 8 hours. |
| • | The IAT sensor is more than 10°C (50°F). |
| • | DTC P0096 runs once per key cycle within the enabling conditions. |
Conditions for Setting the DTC
| • | DTC P0116 must run and pass. |
| • | At start-up, after an 8 hour engine soak time, the IAT sensor 2 temperature is more than 20°C (36°F) higher or lower than the IAT sensor. |
Action Taken When the DTC Sets
DTC P0096 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P0096 is a Type B DTC.
Diagnostic Aids
| • | An IAT sensor that is skewed lower at various ambient temperatures, due to more resistance than is normal, can widen the spread between the 2 sensors and cause this DTC to set. Measure and record the resistance of the IAT sensor and IAT sensor 2 at various ambient temperatures, and then compare those measurements to the Temperature vs. Resistance Table. Refer to Temperature Versus Resistance . |
| • | Inspect both IAT sensors terminals, for corrosion or a poor connection. |
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
Important: Perform this verification procedure only if the ignition has been OFF for eight hours or more.
- If DTC P0112, P0113, P0097, or P0098 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Ignition ON, observe the scan tool IAT sensor, the IAT sensor 2, and the ECT sensor parameters. The readings should be within 15°C (27°F) of each other, and also the ambient temperature.
- Engine running, observe the DTC information with a scan tool. DTC P0096 should not set.
- 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 data.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the MAF/IAT sensor and the IAT sensor 2.
- Ignition OFF, allow sufficient time for the control module to power down. Test for less than 5 ohms of resistance between the IAT sensor low reference circuit terminal D and ground.
- Ignition OFF, allow sufficient time for the control module to power down. Test for less than 5 ohms of resistance between the IAT sensor 2 low reference circuit terminal B and ground.
- Ignition OFF, disconnect the harness connector at the ECM.
- Test for less than 5 ohms of resistance between the signal circuit terminal of the IAT sensor and the corresponding terminal E of the ECM.
- Test for less than 5 ohms of resistance between the signal circuit terminal of the IAT sensor 2 and the corresponding terminal of the ECM.
- If all circuits test normal, test the affected sensor. Refer to Component Testing.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
| ⇒ | If greater than the specified range, repair the open/high resistance in the circuit. |
| ⇒ | If greater than the specified range, repair the open/high resistance in the circuit. |
Component Testing
- Compare the resistance of the IAT sensor 2 sensor to the temperature vs resistance table.
- Compare the resistance of the IAT sensor to the temperature vs resistance.
| ⇒ | If the difference is more than 9 percent, replace the IAT sensor 2. |
| ⇒ | If the difference is more than 9 percent, replace the MAF/IAT sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
