Hyundai Elantra (CN7): Engine Control System / Intake Air Temperature Sensor (IATS)
Description and operation
Intake Air Temperature Sensor (IATS) is included inside Manifold Absolute Pressure Sensor and detects the intake air temperature.
To calculate precise air quantity, correction of the air temperature is needed because air density varies according to the temperature. So the ECM uses not only MAPS signal but also IATS signal. This sensor has a Negative Temperature Coefficient (NTC) and its resistance is in inverse proportion to the temperature.
Specifications
Temperature [°C (°F)]
|
Resistance (kΩ)
|
-40 (-40) ± 1
| 38.88 - 50.78
|
-20 (-4) ± 1
| 13.20 - 16.84
|
0 (32) ± 1
| 5.12 - 6.13
|
20 (68) ± 1
| 2.20 - 2.70
|
25 (77) ± 1
| 1.81 - 2.22
|
40 (104) ± 1
| 1.02 - 1.28
|
60 (140) ± 1
| 0.52 - 0.66
|
80 (176) ± 1
| 0.28 - 0.36
|
100 (212) ± 1
| 0.16 - 0.22
|
120 (248) ± 1
| 0.10 - 0.14
|
130 (266) ± 1
| 0.08 - 0.11
|
150 (302) ± 1
| 0.05 - 0.08
|
Schematic diagrams
Harness Connector
Repair procedures
| 1. | Turn ignition switch OFF. |
| 2. | Disconnect IATS connector. |
| 3. | Measure resistance between IATS terminals 1 and 2. |
| 4. | Check that the resistance is within the specification. Specification : Refer to "Specification" |
|
| 1. | Turn ignition switch OFF and disconnect the battery negative (-) terminal. |
| 2. | Disconnect the manifold absolute pressure sensor connector (A). |
| 3. | Remove the manifold absolute pressure sensor (B) after loosening the bolt. Tightening Torque : 9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft) |
|
| •
| Install the component with the specified torques. |
| •
| Note that internal damage may occur when the component is dropped. In this case, use it after inspecting. |
|
| •
| Insert the sensor in the installation hole and be careful not to damage when installation. |
|
| 1. | Install in the reverse order of removal. |
Description and operation
DescriptionManifold Absolute Pressure Sensor (MAPS) is a speed-density type sensor and is installed on the surge tank. It senses absolute pressure of the surge tank and transfers the analog signal proportional to the pressure to the ECM.
Description and operation
DescriptionThe Engine Coolant Temperature Sensor (ECTS) is located in the cylinder block and cylinder head, and measures the temperature of the engine coolant.
Other information:
Repair procedures
RemovalMood lamp unit1.Disconnect the negative (-) battery terminal.2.Remove the main crash pad assembly.(Refer to Body - "Main Crash Pad Assembly")3.Loosen the mounting screws and remove the main crash pad air duct (A).4.Loosen the mounting screws and remove the mood lamp unit (A).
Description and operation
DescriptionThe A/C Pressure Transducer (APT) converts the pressure value of high pressure line into voltage value after measuring it. By converted voltage value, engine ECU controls the cooling fan by operating it high speed or low speed.
