Diagnostic Trouble Code (DTC) P0113
Intake Air Temperature Sensor High Voltage
What is the circuit like?
- In order to regulate the signal voltage going to the engine control module (ECM) the Intake Air Temperature (IAT) Sensor utilizes the thermistor.
- This circuit receives a 5 volt reference voltage and a ground to the sensor supplied by the ECM.
- The IAT sensor signal voltage will be high when the air is moderately cold as the resistance will be high.
- The IAT sensor signal voltage will be low when the air is moderately warm as the resistance will be low.
QUESTION- WHEN DOES THE DTC SET?
ANSWER- When IAT voltage is < 4.99V
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Measures Taken When DTC Sets |
When Does DTC Clear? |
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1) After three successive trips with a fail the Malfunction Indicator Lamp (MIL) will be seen glowing.
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1) The MIL will automatically switch off after four successive ignition cycles in which the diagnostic will run flawlessly |
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2) The operating conditions recorded by the ECM at the time the diagnostic failed, will be stored in the Freeze Frame and Failure Records will buffer |
2) A history DTC will be unset after 40 repetitive warm up cycles without a fault |
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3) A history DTC is stored. |
3) The scan tool will unset all DTCs |
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4) The ECM will default to 605C (1405F) for intake air temperature |
4) De-linking the ECM battery feed for 10 seconds |
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5) The scan tool will not show the defaulted value |
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Diagnostic Assistance:
- IAT sensor must be compared to the engine coolant temperature (ECT) sensor if the vehicle is at ambient temperature.
- The IAT sensor and the ECT sensor must be near similar, desirably.
- For the ease of estimating an existing skewed sensor, the Temperature vs. Resistance Values table should be referred to.