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| • | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
IAT Sensor Signal | P0112, P0114 | P0113, P0114, P0112 | P0113, P0114 | P0114 |
Low Reference | - | P0113, P0114 | P0113, P0114 | P0114 |
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine running Parameter Normal Range: Varies with ambient temperature | |||
IAT Sensor Signal | 150°C (302°F) | -40°C (-40°F) | -40°C (-40°F)* |
Low Reference | - | -40°C (-40°F) | -40°C (-40°F)* |
*Internal ECM or sensor damage may occur if the circuit is shorted to B+ | |||
The intake air temperature (IAT) sensor is a variable resistor. It is integrated into the mass air flow (MAF) sensor. The IAT sensor has a signal circuit and a low reference circuit. The IAT sensor measures the temperature of the air entering the engine. The engine control module (ECM) supplies 5 V to the IAT signal circuit, and a ground for the IAT low reference circuit.
| • | The engine run time is greater than 1 s. |
| • | The DTC runs continuously when the above conditions are met. |
| • | The engine run time is greater than 1 s. |
| • | The DTC runs continuously when the above conditions are met. |
| • | The ignition is ON or the engine is running. |
| • | This DTC runs continuously within the enabling conditions. |
The ECM detects that the IAT sensor signal is warmer than 149°C (300°F) for greater than 7 s.
The ECM detects that the IAT sensor signal is colder than -60°C (-76°F) for greater than 7 s.
The ECM detects that the IAT sensor signal is intermittent or has abruptly changed for greater than 4 s.
DTCs P0112, P0113, and P0114 are Type B DTCs.
| • | DTCs P0112, P0113, and P0114 are Type B DTCs. |
| • | The ECM commands the cooling fans ON. |
| • | With the ignition ON, the engine OFF, if the engine is cold, 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 elements |
| • | 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 and/or P0114 to set. This condition causes a rapid fluctuation in the IAT Sensor parameter. |
| • | An IAT sensor signal circuit that is shorted to the MAF sensor ignition circuit can cause a DTC P0113 and/or P0114 to set. |
| • | A MAF sensor ground circuit that is open will cause a DTC P0113 and/or a DTC P0114 to set. |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
Note: All electrical components and accessories must be turned OFF and allowed to power down.
| ⇒ | 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 K20 ECM. |
| ⇒ | 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. |
Note: If the fuse in the jumper wire opens, the signal circuit is shorted to voltage and the sensor may be damaged.
| ⇒ | 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. |
Measure and record the resistance of the IAT sensor at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance - Intake Air Temperature Sensor table.
Perform the Diagnostic Repair Verification after completing the repair.
| • | Control Module References for ECM replacement, setup, and programming |
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