Ansaugkrümmer Absolutdrucksensor (MAPS)

Specifications

SPECIFICATIONS

Description and Operation

Description

The Manifold Absolute Pressure Sensor (MAPS) is a density sensor located on the intake manifold. It detects the absolute manifold pressure and sends an analog signal proportional to the pressure to the ECM. The ECM uses this signal to calculate intake air volume and engine speed.

The MAP sensor consists of a piezoelectric element and a hybrid IC that amplifies the output signal of the element. The element is a silicon diaphragm that changes the pressure-sensitive variable resistance of the semiconductor. Since there is 100% vacuum on both sides of the sensor and intake manifold pressure is applied to one side, the sensor is proportional. Using the deflection of the silicon diaphragm, it outputs an analog signal that changes with pressure.

Schematic diagrams

Circuit diagram

repair procedures

TEST

1. 1

   Connect the KDS to the Data Link Connector (DLC).

2. 2

   Measure the MAPS output voltage at idle and with the ignition switch ON.

   Cover [kPa (kg/cm²)]	Output Voltage (V) [Vref = 5 V]
   32,5 (0,33, 4,71)	0,5
   284 (2,90, 41,19)	4,5

expansion

1. 1

   Turn the ignition switch OFF and disconnect the negative (-) battery terminal.

2. 2

   Disconnect the manifold absolute pressure (MAP) sensor connector (A).

3. 3

   Remove the MAP sensor (B) from the intake manifold by loosening the mounting screws.

   MAP sensor mounting screw: 6.4~8.3 N·m

   

Installation

1. Installation is the reverse of removal.

Troubleshooting

Signal