Captiva |
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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 | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
IAT Sensor Signal | P0112 | P0113 | P0113 | P0113 | - |
Low Reference | - | P0113 | P0113 | P0113 | - |
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) |
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.
• | 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. |
• | 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. |
The ECM detects that the IAT is warmer than 149°C (300°F) for at least 6 s.
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.
DTCs P0112 and P0113 are Type B DTCs.
DTCs P0112 and P0113 are Type B DTCs.
• | 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. |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | 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. |
⇒ | 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. |
⇒ | 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 table.
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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