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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 00, P0114 00 | P0113 00, P0114 00 | P0113 00, P0114 00 | P0114 00 |
Low Reference | - | P0113 00, P0114 00 | P0113 00, P0114 00 | P0114 00 |
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine operating in closed loop. 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 inlet air temperature (IAT) sensor is an integral part of the mass air flow (MAF) sensor. The inlet air temperature (IAT) sensor is a variable resistor that measures the temperature of the air entering the engine. The IAT sensor has a signal circuit and a low reference circuit. The engine control module (ECM) supplies 5 V to the IAT signal circuit and an ground for the IAT low reference circuit.
The following table illustrates the difference between temperature, resistance, and voltage:
IAT | IAT Resistance | IAT Signal Voltage |
|---|---|---|
Cold | High | High |
Warm | Low | Low |
| • | DTCs P0117 00, or P0118 00, are not set |
| • | The engine run time is greater than 10 s. |
| • | The engine coolant temperature (ECT) sensor is less than 150°C (302°F). |
| • | The vehicle speed is greater than 0 km/h (0 MPH). |
| • | The DTC runs continuously once the above conditions are met. |
| • | DTCs P0107 00, P0108 00, P0117 00, or P0118 00, are not set. |
| • | The engine run time is greater than 10 s. |
| • | The airflow into the engine is less than 512 g/s. |
| • | The engine coolant temperature (ECT) sensor is greater than -40°C (-40°F). |
| • | The vehicle speed is less than 512 km/h (318 MPH). |
| • | The DTC runs continuously once the above conditions are met. |
| • | DTC P0112 00, or P0113 00 is not set. |
| • | The ignition is ON or the engine is running. |
| • | The battery voltage is greater than 9 V. |
The ECM detects that the IAT sensor is greater than 149°C (300°F) for greater than 10 s.
The ECM detects that the IAT sensor parameter is colder than -40°C (-40°F) for greater than 4 s.
The ECM detects that the IAT sensor signal has abruptly changed a minimum of 10°C (18°F) warmer or colder for greater than 2 s.
DTCs P0112 00, P0113 00 and P0114 00 are Type B DTCs.
DTCs P0112 00, P0113 00 and P0114 00 are Type B DTCs.
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 Engine Control Module. |
| ⇒ | If warmer than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module. |
Note: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the sensor may be damaged.
| ⇒ | 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 Engine Control Module. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Mass Airflow Sensor Replacement : 1.4L LUH and LUJ |
| • | Control Module References for ECM replacement, setup, and programming |
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