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

6.5.5. The air temperature sensor on a soaking-up collector (IAT sensor)


Temperature characteristic of resistance of IAT-of the sensor

The air temperature sensor on a soaking-up collector is mounted in the case of the air filter. The sensor represents the resistor which value of resistance changes depending on air temperature arriving in the engine.

At low temperatures value of resistance will be big (for example, at temperature 20 ° About resistance of the sensor makes 2–3 kiloohms) while at high temperatures resistance decreases (at 80 ° About resistance of the sensor makes from 200 to 400 Ohm).

From the electronic control unit on the sensor of temperature tension about 5 In (basic tension) moves. Tension on the sensor of temperature changes according to temperature of arriving air. The signal of tension arriving from the sensor on the control unit, will be big at low temperature and small at high. At failures in operation of the sensor in memory of the control unit the code 24 usually registers.


1. For check of IAT-of the sensor (1) open the bifurcate socket. Turn the ignition key in the situation ON, but the engine do not start.
2. Measure basic tension on contact of a yellow-black wire which about 5 Century should be.
3. If basic tension differs from 5,0 In, hand over the control unit in a car-care center workshop for check.
4. Measure resistance between IAT sensor contacts. At low air temperature resistance should be big. Further, start the engine and translate in an operating mode idling. Warm up the engine.
5. Switch off ignition, disconnect the sensor and measure resistance between contacts. At high temperature of air resistance of the sensor should be small. If change of resistance of the sensor differs from described, the sensor replace.