Toyota Corolla

1992-1998 of release

Repair and car operation

Toyota Corolla
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
+ 4. Systems of cooling, heating
+ 5. Fuel, exhaust systems
- 6. System of decrease in toxicity
   6.1. Specifications
   6.2. Electronic control system
   6.3. Electronic control unit
   + 6.4. System of onboard diagnostics
   - 6.5. Sensors of system of automatic control of the engine
      6.5.1. The sensor of temperature of cooling liquid
      6.5.2. Sensor of concentration of oxygen
      6.5.3. Sensor of an angle of rotation of a butterfly valve (TPS sensor)
      6.5.4. The sensor of absolute pressure on a soaking-up collector (MAR-datchik)
      6.5.5. The air temperature sensor on a soaking-up collector (IAT sensor)
      6.5.6. Temperature sensor of system retsirkulyatsiya (EGR sensor)
      6.5.7. Sensor of speed of the car (VSS sensor)
      6.5.8. Detonation sensor
      6.5.9. Sensor of an angle of rotation of the crankshaft
   6.6. Catching system паров gasoline
   6.7. System retsirkulyatsiya (EGR system)
   6.8. System of compulsory ventilation of a case (PCV system)
   6.9. Catalytic converter
+ 7. Transmissions
+ 8. Coupling and semi-axes
+ 9. Brake system
+ 10. Suspension bracket and steering
+ 11. Body
+ 12. Electric equipment

6.5.4. The sensor of absolute pressure on a soaking-up collector (MAR-datchik)

GENERAL INFORMATION

The MAP sensor traces pressure on the soaking-up collector, changing depending on number of turns and engine loading, transforming pressure size to an electric signal. The control unit uses information from the MAP sensor for dispensing of an injected portion of fuel and adjustment of the moment of ignition. On the control unit information on pressure arrives in the form of a tension signal. This signal can be found by means of the voltmeter. Under ideal conditions tension changes from 4,0 volts at the switched-off engine (the razryazheniye is absent), to 0,5 volts idling (pressure about 600 mm of mercury.).

Check

PERFORMANCE ORDER

	1. Include ignition (the engine do not start). Disconnect the socket and check basic tension of the MAP sensor on contact of a yellow wire. Tension should be about 5,0 volts.
2. Disconnect a vacuum hose from the MAP sensor and connect the portable vacuum pump.
	3. Again attach the socket to the MAP sensor. Connect from a reverse side of the sensor positive (+) щуп the voltmeter to a wire with light-green / red coloring, and negative (-) щуп – to a wire of brown color (photo). In the absence of depression tension of the sensor should be in limits from 3 to 4 volts.
	4. Create in the sensor depression of 600 mm рт. a column also measure tension. Indications of the voltmeter should be within 0,5–1,5 volts.
5. If results of tests unsatisfactory, replace the sensor.