P0110

DTC P0110, P0112, or P0113

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 Descriptors
DTC P0110
- Intake Air Temperature (IAT) Sensor Circuit

DTC P0112
- Intake Air Temperature (IAT) Sensor Circuit Low Voltage

DTC P0113
- Intake Air Temperature (IAT) Sensor Circuit High Voltage

Diagnostic Fault Information





Typical Scan Tool Data





Circuit Description

The intake air temperature (IAT) sensor is an integral part of the mass air flow (MAF) sensor. The IAT sensor is a variable resistor that measures the temperature of the intake air. The powertrain control module (PCM) 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:





Conditions for Running the DTC

P0110, P0112, or P0113
* The ignition is ON, or the engine is operating.
* The DTCs run continuously once the above condition is met.

Conditions for Setting the DTC

P0110
* The ECM detects that the IAT sensor is colder than -39°C (-40°F) for greater than 0.5 seconds.
OR
* The ECM detects that the IAT sensor is greater than 139°C (283°F) for greater than 0.5 seconds.

P0112

The ECM detects that the IAT sensor is greater than 139°C (282°F) for greater than 0.5 seconds.

P0113

The ECM detects that the IAT sensor is colder than -39°C (-39°F) for greater than 0.5 seconds.

Action Taken When the DTC Sets

* DTC P0110, P0112 and P0113 are Type A DTCs.
* The PCM enters the Fail-Safe function and the intake air temperature defaults to 20°C (68°F).

Conditions for Clearing the MIL/DTC

DTC P0110, P0112 and P0113 are Type A DTCs.

Diagnostic Aids

* If the vehicle has sat overnight, the IAT sensor and the ECT sensor values should display within 3°C (5°F).
* High resistance in the circuit of the IAT sensor could set a DTC.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
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 (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Engine idling for 1 minute, observe the DTC information with a scan tool. DTCs P0110, P0112 and P0113 should not set.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does 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 MAF/IAT sensor.
2. Ignition OFF, test for less than 10 ohm between the low reference circuit terminal 2 and ground G104.

• 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 tests normal, replace the PCM.

3. Ignition ON, verify that the IAT sensor parameter is at -40°C (-40°F).

• If warmer than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the PCM.

4. Install a 3 A fused jumper wire between the signal circuit terminal 1 and ground. Verify the IAT sensor parameter is greater than 139°C (280°F).

• If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PCM.

5. If all circuits test normal, test or replace the IAT sensor.

Component Testing

1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.

Note: A thermometer can be used to test the sensor off the vehicle.

2. Test the IAT sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Temperature Versus Resistance (Temperature Versus Resistance) table and verify that the resistance is within 5 percent of the specification.

• If not within the specified range, replace the IAT sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Mass Airflow Sensor Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for control module replacement, setup, and programming