P0096
DTC P0096
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P0096
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Intake Air Temperature (IAT) Sensor 2 Performance
Diagnostic Fault Information
Typical Scan Tool Data
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 V 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 warmer than 10°C (50°F).
* DTC P0096 runs once per key cycle within the enabling conditions.
Conditions for Setting the DTC
At start-up, after an 8 hour engine soak time, the IAT sensor 2 temperature is more than 20°C (36°F) warmer or colder 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 Temperature Versus Resistance Temperature Versus Resistance table.
* Inspect both IAT sensors terminals, for corrosion or a poor connection.
Reference Information
Schematic Reference
Engine Controls Schematics (LS3) [1][2]Electrical DiagramsEngine Controls Schematics (LS9) [1][2]Electrical DiagramsEngine Controls Schematics (LS7) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Folding Top 5 Bow Lowered Switch (CM7)
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Note:
Perform this verification procedure only if the ignition has been OFF for 8 hours or more.
1. Verify that DTCs P0112, P0113, P0097, or P0098 are not set.
• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
2. Ignition ON, observe the scan tool IAT sensor, the IAT sensor 2, and the engine coolant temperature (ECT) sensor parameters. The readings should be within 15°C (27°F) of each other, and also the ambient temperature.
3. Operate the vehicle within the Conditions for Running the DTC to verify that the DTC has 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, disconnect the harness connector at the IAT sensor 2.
2. Ignition OFF, all vehicles systems OFF, this may take up to for 2 min, test for less than 5 ohms between the low reference circuit terminal B and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, verify the scan tool IAT sensor 2 parameter is colder than -39°C (-38°F).
• If warmer than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
4. Install a 3 A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool IAT sensor 2 parameter is warmer than 130°C (266°F).
• If colder than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
5. If all circuits test normal, test or replace IAT sensor 2.
Component Testing
Measure and record the resistance of the MAF/IAT sensor and IAT sensor 2 at various ambient temperatures, and then compare those measurements to the Temperature Versus Resistance Temperature Versus Resistance table.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Intake Air Temperature Sensor Replacement (LS9)
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement Service and Repair
* Control Module References Control Module References for ECM replacement, setup, and programming