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DTC P0112 or P0113 - LE5, LE9

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 P0112: Inlet Air Temperature (IAT) Sensor Circuit Low Voltage

DTC P0113: Inlet Air Temperature (IAT) Sensor Circuit High Voltage

Diagnostic Fault Information

Circuit

Short to Ground

High Resistance

Open

Short to Voltage

Signal Performance

IAT Sensor Signal

P0112

P0113

P0113

P0113

-

Low Reference

-

P0113

P0113

P0113

-

Typical Scan Tool Data

IAT Sensor

Circuit

Short to Ground

Open

Short to Voltage

Operating Conditions: Engine Running

Parameter Normal Range: -39 to +120°C (-38 to +248°F) depending on the ambient temperature

IAT Sensor

150°C (302°F)

-40°C (-40°F)

-40°C (-40°F)

Low Reference

-

-40°C (-40°F)

-40°C (-40°F)

Circuit/System Description

The inlet air temperature (IAT) sensor is a variable resistor that measures the temperature of the air entering the engine. The engine control module (ECM) supplies 5 V to the IAT sensor signal circuit and a ground for the low reference circuit.

Conditions for Running the DTC

P0112

    • DTC P0117, P0118, P0128, P0502, or P0503 is not set.
    • The engine is running for at least 10 s.
    • The engine coolant temperature (ECT) is colder than 150°C (302°F).
    • This DTC runs continuously within the enabling conditions.

P0113

    • DTC P0101, P0102, P0103, , P0117, or P0118 is not set.
    • The engine is running for at least 10 s.
    • The ECT is warmer than -40°C (-40°F).
    • The MAF is not more than 512 g/s.
    • This DTC runs continuously within the enabling conditions.

Conditions for Setting the DTC

P0112

The ECM detects that the IAT is warmer than 149°C (300°F) for at least 6 s.

P0113

Note: The scan tool display range is -40 to +120°C (-40 to +248°F)

The ECM detects that the IAT is colder than -60°C (-76°F) for at least 6 s.

Action Taken When the DTC Sets

DTCs P0112 and P0113 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0112 and P0113 are Type B DTCs.

Diagnostic Aids
    • When the engine is cold, at ignition ON, a properly functioning IAT sensor will gradually increase the scan tool IAT Sensor parameter. This is due to the heat that is generated by the mass air flow (MAF) sensor heating element.
    • Depending on the ambient temperature, an IAT sensor signal circuit or low reference circuit that is shorted to the MAF sensor signal circuit can cause a DTC P0113 to set. This condition causes a rapid fluctuation in the IAT Sensor parameter.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification
  1. Ignition OFF for 8 h or greater.
  2. Ignition ON, observe the scan tool IAT Sensor and ECT Sensor parameters. The IAT, ECT, and ambient temperatures should be within 15°C (27°F) of each other.
  3. Engine running, observe the scan tool IAT Sensor parameter. The reading should be between -39 to +120°C (-38 to +248°F) depending on the current ambient temperature and the vehicle operating conditions.
  4. 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 B75B mass air flow /intake air temperature sensor.
  2. Ignition OFF, all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the low reference circuit terminal D and ground.
    3. ⇒If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  3. Ignition ON, verify the scan tool IAT Sensor parameter is colder than -39°C (-38°F).
    4. ⇒If warmer than the specified range, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the K20 ECM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool IAT Sensor parameter is warmer than 149°C (300°F).
    5. ⇒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 K20 ECM.
  5. If the circuits test normal, test or replace the B75B mass air flow /intake air temperature sensor.

Component Testing

Measure and record the resistance of the IAT sensor at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance table.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Mass Airflow Sensor with Inlet Air Temperature Sensor Replacement : LE5 or LE9
    • Control Module References for ECM replacement, setup, and programming
   


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