Manifold Absolute Pressure Sensor (MAPS)

Specifications

Specification

Description and Operation

Description

The Manifold Absolute Pressure Sensor (MAPS) is a speed-density type sensor and is installed on the surge tank. It measures the absolute pressure of the surge tank and sends an analog signal proportional to the pressure to the ECM. Using this signal, the ECM calculates the intake air volume and engine speed.

The MAPS consists of a piezoelectric element and a hybrid IC that amplifies the element's output signal. The element is a silicon diaphragm that adapts to pressure and has the piezoresistive effect of a semiconductor. Since vacuum and intake manifold pressure are applied to both sides of the sensor respectively, the sensor can output an analog signal proportional to the pressure change via the silicon.

Circuit Diagrams

Wiring Diagram

Harness Connector

Repair Procedures

Inspection

1. 1

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

2. 2

   Measure the MAP sensor output voltage at idle and with the ignition ON.

   Pressure [kPa (kgf/cm², psi)]	Output voltage (V)
   32,5 (0,33, 4,71)	0,5
   284 (2,90, 41,19)	4,5

Removal and Installation

1. 1

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

2. 2

   Disconnect the MAP sensor connector (A).

3. 3

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

   Manifold Absolute Pressure Sensor Mounting Bolt:

   9,8–11.8 N·m

   

4. 4

   Install in the reverse order of removal.