Hyundai Elantra (CN7): Engine Control System / Manifold Absolute Pressure Sensor (MAPS)
Description and operation
Manifold 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. By using this signal, the ECM calculates the intake air quantity and engine speed.
The MAPS consists of a piezo-electric element and a hybrid IC amplifying the element output signal. The element is silicon diaphragm type and adapts pressure sensitive variable resistor effect of semi-conductor. Because 100% vacuum and the manifold pressure apply to both sides of the sensor respectively, this sensor can output analog signal by using the silicon variation proportional to pressure change.
Specifications
Pressure
[kPa (kgf/cm², psi)]
|
Output Voltage (V)
[Vref = 5.0V]
|
10 (0.10, 1.45)
| 0.5
|
40 (0.40, 5.80)
| 0.91
|
80 (0.81, 11.60)
| 1.47
|
120 (1.22, 17.40)
| 2.02
|
160 (1.63, 23.20)
| 2.57
|
200 (2.03, 29.00)
| 3.12
|
220 (2.24, 31.90)
| 3.4
|
240 (2.44, 34.80)
| 3.67
|
280 (2.85, 40.61)
| 4.22
|
300 (3.05 43.51)
| 4.5
|
Schematic diagrams
Harness Connector
Repair procedures
| 1. | Connect a diagnostic tool on Data Link Connector (DLC). |
| 2. | Check MAPS output voltage at idle and IG ON.
Condition
| Output Voltage (V)
| IG ON
| 3.9 - 4.1
| Idle
| 0.8 - 1.6
|
|
| 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
DescriptionThe Electronic Throttle Control (ETC) System consists of a throttle body with an integrated control motor and throttle position sensor (TPS).
Description and operation
DescriptionIntake Air Temperature Sensor (IATS) is included inside Manifold Absolute Pressure Sensor and detects the intake air temperature.
Other information:
Description and operation
DescriptionThe In-car air temperature sensor is built in the heater & A/C control unit.The sensor contains a thermistor which measures the temperature of the inside. The signal decided by the resistance value which changes in accordance with perceived inside temperature, is delivered to heater control unit and accor
Trouble Symptom ChartsTrouble Symptom 1Trouble Symptom 2
Trouble symptom
Probable cause
Remedy
The set vehicle speed varies greatly upward or downward"Surging" (repeated alternating acceleration and deceleration) occurs after settingMalfunction of the vehicle speed se
