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 | -- | -- | -- | -- |
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)* |
*Internal ECM or sensor damage may occur if the circuit is shorted to B+ | |||
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 | -- | -- | -- |
*Internal ECM or sensor damage may occur if the circuit is shorted to B+ | |||
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 5V 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 greater than 8 hours. |
| • | The IAT sensor is greater 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 greater 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 greater 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
Control Module References for scan tool information
Circuit/System Verification
Note: Perform this verification procedure only if the ignition has been OFF for eight hours or more.
- Verify that DTCs P0112, P0113, P0097, or P0098 are not set.
- 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.
- 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.
| ⇒ | If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the MAF/IAT sensor and the IAT sensor 2.
- Ignition OFF and scan tool disconnected for 90 seconds, test for less than 5Ω between the IAT sensor low reference circuit terminal A and ground.
- Ignition OFF, allow sufficient time for the control module to power down. Test for less than 5Ω between the IAT sensor 2 low reference circuit terminal B and ground.
- Ignition OFF, disconnect the X2 and X3 harness connectors at the ECM.
- Test for less than 5 Ω between the signal circuit terminal B of the IAT sensor and the corresponding terminal 62 X2 of the ECM.
- Test for less than 5 Ω between the signal circuit terminal A of the IAT sensor 2 and the corresponding terminal 56 X3 of the ECM.
- If all circuits test normal, test or replace the affected sensor.
| ⇒ | 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.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
