Toyota Corolla

1992-1998 of release

Repair and operation of the car

Toyota Corolla
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
+ 4. Cooling systems, 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. 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 the soaking-up collector (MAR-sensor)
      6.5.5. The air temperature sensor on the soaking-up collector (IAT sensor)
      6.5.6. Temperature sensor of system of recirculation (EGR sensor)
      6.5.7. Car speed sensor (VSS sensor)
      6.5.8. Detonation sensor
      6.5.9. Sensor of an angle of rotation of the crankshaft
   6.6. System of catching of vapors of gasoline
   6.7. System of recirculation (EGR system)
   6.8. System of compulsory ventilation of a case (PCV system)
   6.9. Catalytic converter
+ 7. Transmissions
+ 8. Coupling and half shafts
+ 9. Brake system
+ 10. Suspension bracket and steering
+ 11. Body
+ 12. Electric equipment

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


The MAP sensor traces pressure on the soaking-up collector changing depending on number of turns and loading of the engine, transforming pressure size to an electric signal. The control unit uses information from the MAP sensor for dispensing of an injectable portion of fuel and adjustment of the moment of ignition. On the control unit information on pressure arrives in the form of 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 (discharge is absent), to 0,5 volts idling (pressure about 600 mm of mercury.).


1. Include ignition (the engine do not start). Disconnect the socket and check the basic tension of the MAP sensor on contact of a yellow wire. Tension has to 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 (+) the voltmeter probe to a wire with light-green / red coloring, and negative (-) the probe – to a wire of brown color (photo). In the absence of depression tension of the sensor has to be ranging from 3 to 4 volts.

4. Create in the sensor depression of 600 mm rt. a column also measure tension. Indications of the voltmeter has to be within 0,5–1,5 volts.
5. If results of tests unsatisfactory, replace the sensor.