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DTC P0112, P0113, or P0114

DTC P0112, P0113, or P0114

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

Intake Air Temperature (IAT) Sensor Circuit Low Voltage

DTC P0113

Intake Air Temperature (IAT) Sensor Circuit High Voltage

DTC P0114

Intake Air Temperature (IAT) Sensor Circuit Intermittent

Diagnostic Fault Information

Circuit Short to Ground Open /High Resistance Short to Voltage Signal Performance
IAT Sensor Signal

P0112, P0114

P0113, P0114

P0113, P0114

P0114, P2199

Low Reference

-

P0113, P0114

P0113, P0114

P0114, P2199



Typical Scan Tool Data

IAT Sensor

Circuit Short to Ground Open Short to Voltage
Operating Conditions: Engine Running

Parameter Normal Range: Varies with ambient temperature

IAT Sensor Signal

143°C (289°F)

-40°C (-40°F)

-40°C (-40°F)

Low Reference

-

-40°C (-40°F)

-40°C (-40°F)



Circuit/System Description

The intake air temperature (IAT) sensor is integrated with the mass air flow (MAF) sensor. The IAT sensor is a variable resistor that measures the temperature of the air when it first enters the induction system. The engine control module (ECM) supplies 5 V to the IAT signal circuit and a ground for the IAT low reference circuit.

Conditions for Running the DTC


P0112

The ignition is ON or the engine is running.

This DTC runs continuously within the enabling conditions.



P0113

The engine is running.

This DTC runs continuously within the enabling conditions.



P0114

The ignition is ON or the engine is running.

This DTC runs continuously within the enabling conditions.


Conditions for Setting the DTC

P0112

The ECM detects that the IAT is more than 142°C (288°F) for more than 15 s.

P0113

The ECM detects that the IAT is less than -39°C (-38°F) for more than 15 s at idle.

P0114

The ECM detects that the IAT sensor signal is intermittent or has abruptly changed for more than 4 s.

Action Taken When the DTC Sets

DTCs P0112, P0113, P0114 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0112, P0113, P0114 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 MAF sensor heating elements.

Depending on the ambient temperature, an IAT sensor signal circuit that is shorted to the MAF sensor signal circuit can cause either a rapid fluctuation in the IAT Sensor parameter or cause it to become stuck at a given value.

An IAT low reference circuit that is open can cause the IAT Sensor parameter response to be sluggish.

A MAF sensor ground circuit that is open will cause a DTC P0113 and/or a DTC P0114 to set.


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


If the ignition has been OFF for 8 h or greater, the IAT sensor, the IAT 2 sensor and the engine coolant temperature (ECT) sensor should be within 9°C (16°F) of each other. Ignition ON, observe the scan tool IAT Sensor, IAT Sensor 2 and the ECT Sensor parameters. Compare those sensor parameters to each other to determine if the condition is current.

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.

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 MAF/IAT sensor.

2. Ignition OFF and 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 MAF sensor ground circuit terminal B and ground.

3. If more than the specified range, test the MAF sensor ground circuit for an open/high resistance.

4. Ignition OFF and 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 IAT low reference circuit terminal D and ground.

5. If more than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

6. Ignition ON, verify the scan tool IAT Sensor parameter is less than -39°C (-38°F).

7. If more than the specified range, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the K20 ECM.

8. Install a 3A fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool IAT Sensor parameter is more than 142°C (288°F).

9. If less 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.

10. If the circuits test normal, test or replace the B75B MAF/IAT 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 (IAT 2-LDK with Turbocharger) Temperature Versus Resistance (ECT-LDK with Turbocharger) Temperature Versus Resistance (IAT-LDK with Turbocharger) table.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Mass Airflow Sensor Replacement

Control Module References for ECM replacement, setup, and programming