DTC P0112, P0113, or P0114
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DTC P0112, P0113, or P0114
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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
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open /High Resistance
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Short to Voltage
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Signal Performance
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IAT Sensor Signal
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P0112, P0114
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P0113, P0114
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P0113, P0114
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P0114, P2199
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Low Reference
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-
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P0113, P0114
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P0113, P0114
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P0114, P2199
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IAT Sensor
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Circuit
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Short to Ground
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Open
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Short to Voltage
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Operating Conditions:
Engine Running
Parameter Normal Range:
Varies with ambient temperature
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IAT Sensor Signal
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143°C (289°F)
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-40°C (-40°F)
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-40°C (-40°F)
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Low Reference
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-
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-40°C (-40°F)
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-40°C (-40°F)
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Circuit/System Description
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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.
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Conditions for Running the DTC
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P0112
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The ignition is ON or the engine is running.
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This DTC runs continuously within the enabling conditions.
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P0113
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This DTC runs continuously within the enabling conditions.
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P0114
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The ignition is ON or the engine is running.
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This DTC runs continuously within the enabling conditions.
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Conditions for Setting the DTC
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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.
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Action Taken When the DTC Sets
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DTCs P0112, P0113, P0114 are Type B DTCs.
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Conditions for Clearing the MIL/DTC
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DTCs P0112, P0113, P0114 are Type B DTCs.
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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.
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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.
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An IAT low reference circuit that is open can cause the IAT Sensor parameter response to be sluggish.
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A MAF sensor ground circuit that is open will cause a DTC P0113 and/or a DTC P0114 to set.
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Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information.
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Circuit/System Verification
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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.
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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.
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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.
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1.
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Ignition OFF, disconnect the harness connector at the B75B MAF/IAT sensor.
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2.
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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.
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3.
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If more than the specified range, test the MAF sensor ground circuit for an open/high resistance.
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4.
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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.
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5.
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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.
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6.
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Ignition ON, verify the scan tool IAT Sensor parameter is less than -39°C (-38°F).
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7.
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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.
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8.
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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).
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9.
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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.
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10.
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If the circuits test normal, test or replace the B75B MAF/IAT sensor.
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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.
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
