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 P0097: Intake Air Temperature (IAT) Sensor 2 Circuit Low VoltageDTC P0098: Intake Air Temperature (IAT) Sensor 2 Circuit High Voltage
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage |
|---|---|---|---|---|
IAT Sensor 2 Signal | P0097 | P0098 | P0098 | P0098 |
IAT Sensor 2 Low Reference | -- | P0098 | P0098 | P0098 |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON or Engine Running Parameter Normal Range: -39 to +190°C (-38 to +374°F) | |||
IAT Sensor 2 Signal | 200°C (392°F) | -40°C (-40°F) | -40°C (-40°F) |
IAT Sensor 2 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 entering the engine. The engine control module (ECM) supplies 5 volts to the IAT signal 2 circuit, and a ground for the IAT sensor 2 low reference circuit. When the IAT sensor is cold, the sensor resistance is high. When the air temperature increases, the sensor resistance decreases. With high sensor resistance, the ECM detects a high voltage on the IAT signal circuit. With lower sensor resistance, the ECM detects a lower voltage on the IAT signal circuit.
Conditions for Running the DTC
P0097
| • | DTC P0098 is not set. |
| • | The battery voltage is between 10-16 volts. |
| • | The ignition is ON for longer than 2 seconds. |
P0098
| • | DTCs P0097, P0112, and P0113 are not set. |
| • | The battery voltage is between 10-16 volts. |
| • | The ignition switch is ON for longer than 2 seconds. |
Conditions for Setting the DTC
P0097
The ECM detects that the IAT sensor 2 signal voltage is less than 0.1 volt.
P0098
The ECM detects that the IAT sensor 2 signal voltage is more than 4.9 volts.
Action Taken When the DTC Sets
DTCs P0097 and P0098 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0097 and P0098 are Type A DTCs.
Diagnostic Aids
Inspect for any recent engine mechanical repairs. An incorrectly installed IAT sensor 2 will cause this DTC to set.
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
Verify the integrity of the IAT sensor by inspecting for the following conditions:
| • | Damaged components |
| • | Loose or improper installation |
Circuit/System Testing
Important: You must perform Circuit/System Verification before proceeding with Circuit/System Testing.
- Ignition OFF, disconnect the harness connector at the IAT sensor 2.
- Ignition OFF, test for less than 5 ohms between the low reference circuit terminal 1 and ground.
- Ignition ON, verify the scan tool IAT Sensor 2 parameter is less than -39°C (-38°F).
- Install a 3A 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 greater than 190°C (374°F).
- If all circuits test normal, replace the IAT sensor 2.
| ⇒ | If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
| ⇒ | If greater than the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the ECM. |
| ⇒ | If less than the specified range, test the signal circuit and low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. |
Component Testing
- Ignition OFF, disconnect the harness connector at the IAT sensor 2.
- Measure the resistance between the signal terminal 2 and the low reference circuit terminal 1 at the sensor. Compare the value to the Temperature Vs Resistance table. Verify the resistance is within 5 percent of the specification. Refer to Temperature Versus Resistance.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
