Hyundai Creta: Engine Control System / Manifold Absolute Pressure Sensor (MAPS)

Description and operation

Description
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

Specification
Pressure (kPa)
Output Voltage (V)
20.0
0.79
46.66
1.84
101.32
4.0

Troubleshooting

Waveform

Schematic diagrams

Circuit Diagram
(M/T)

(A/T)

Repair procedures

Inspection
1.
Connect a GDS 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

Removal
1.
Turn the ignition switch OFF and disconnect the battery negative (-) terminal.
2.
Remove the resonator and the air intake hose.
(Refer to Engine Mechanical System - "ETC (Electronic Throttle control) System")
3.
Remove the ETC module.
(Refer to Engine Control System - "ETC")
4.
Disconnect the manifold absolute pressure sensor connector (A).
5.
Remove the mounting bolt (B), and then remove the sensor from the surge tank.

Installation
  
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.
  
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.
1.
Install in the reverse order of removal.
Manifold absolute pressure sensor mounting bolt :
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
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