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

6.5.1. The sensor of temperature of cooling liquid


Temperature characteristic of resistance of the sensor

At temperature increase (heating of the engine) resistance of the sensor decreases.

The sensor of temperature of cooling liquid represents a termistor (the resistor the tension size on which depends on temperature). In process of reduction of temperature of the sensor its resistance increases. In process of increase in temperature of the sensor its resistance decreases (see fig. Temperature characteristic of resistance of the sensor). About failure of this sensor the code 22 signals. This code indicates damage of a chain of the sensor therefore more often for elimination of malfunction it is necessary to repair the socket or conducting, or to replace the sensor.


1. For check of the sensor disconnect the socket (it is specified by an arrow) and measure resistance of the sensor. On the cold engine (at 20 ° C), resistance should be from 2 to 3 kiloohms. Start the engine and warm up it to working temperature (82 ° C) – resistance of the sensor should be from 200 to 400 Ohm.


If necessary remove the sensor and place it in a vessel with warm water. Measure resistance and compare to values on the characteristic.

2. If values of resistance of the sensor of temperature cooling within norm, check a chain. For this purpose turn the ignition key in the situation ON (the engine does not work) and check tension which about 5,0 volts should be.


1. To remove the sensor, wring out latches, disconnect the socket and accurately turn out the sensor.


Be careful at the handling of the sensor of cooling liquid. Damage of the sensor will affect work of all system of injection of fuel.

2. Before installation of the new sensor wrap up contacts by a teflon tape for leak and corrosion prevention.
3. Installation is carried out upside-down.