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

6.5.1. Sensor of temperature of cooling liquid


Temperature characteristic of resistance of the sensor

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

The sensor of temperature of cooling liquid represents a thermistor (the resistor 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 rice. 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 most 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 sensor resistance. On the cold engine (at 20 °C), resistance has to be from 2 to 3 kOhm. Start the engine and warm up it up to the working temperature (82 °C) – resistance of the sensor has to be from 200 to 400 Ohms.


If necessary remove the sensor and place it in a vessel with heated 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 have to 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 influence work of all system of injection of fuel.

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