P0110
DTC P0110, P0112, or P0113
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) 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 poweertrain 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 DTC runs continuously once the above condition is met.
Conditions for Setting the DTC
P0110
* The temperature input is -40°C (-40°F), 4.91 volts, for at least 0.5 seconds.
OR
* The temperature input is 140°C (284°F), 0.18 volts, for at least 0.5 seconds.
P0112
The temperature input is more than 140°C (284°F), 0.14 volts, for at least 0.5 seconds.
P0113
The temperature input is less than -40°C (-40°F), 4.91 volts, for at least 0.5 seconds.
Action Taken When the DTC Sets
DTC P0110, P0112 and P0113 are Type A DTCs.
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 (Electrical Diagrams)
Connector End View Reference
* Powertrain Control Module Connector End Views (Powertrain Control Module Connector End Views)
* Engine Controls Connector End Views (Engine Controls Connector End Views)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
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 MAF/IAT sensor.
2. Test for less than 5 ohms between the low reference circuit terminal 5 and ground.
• 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 greater than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the PCM.
4. Install a 3A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 5. 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 intake air temperature (IAT) sensor.
Important: 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.
* Intake Air Temperature Sensor Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for engine control module replacement, setup, and programming