Skoda Felicia

The detailed description of check of the sensor switch is provided in the Section Check of Serviceability of Functioning, removal, installation, dismantling and assembly of the fan of the cooling system among procedures of check of the fan.

1. The sensor switch is screwed in a radiator body.
2. Disconnect a negative wire from the battery, then merge cooling liquid, having lowered its level lower than the level of an arrangement of the sensor switch. Alternatively, prepare a suitable stopper which can muffle quickly an opening under installation of the sensor switch. Try not to damage a radiator and not to allow hit in system of garbage and foreign objects.

3. Disconnect an electrical wiring from the sensor switch.

4. Carefully turn out the sensor switch and remove it from a radiator. Remove also sealing washer. If cooling liquid did not merge, immediately muffle an opening the prepared stopper.

1. Installation is made upside-down. Do not forget to replace a sealing washer. Tighten the sensor switch with the required effort, then add necessary amount of cooling liquid in system.
2. In conclusion start the engine and warm up it up to the normal working temperature. make sure of serviceability of functioning of the fan - it has to join and be switched off in due time.

3. The stabilized supply voltage on temperature measuring instrument from an instrument guard (via the switch of ignition and a safety lock). The condition of a contour of grounding of the measuring instrument is controlled by the CTS sensor. The main CTS component is the thermistor - the resistor which resistance falls with increase in temperature. At cold cooling liquid resistance of a thermistor is big and through the measuring instrument there passes small current, at the same time the arrow of the index is in the lower range of a scale (the blue sector). In process of an engine warming up resistance of the sensor falls, current grows and the arrow is displaced aside up, approaching the red sector of a scale. Faulty CTS is subject to replacement.
4. In case of refusal CTS first of all should check serviceability of functioning of other components of a combination of devices - if they are deenergized at all, check existence of food on a guard. If indications of measuring instruments are unstable, is faulty there can to be a voltage stabilizer which is built in in the printed circuit board of an instrument guard which needs to be replaced (see the Head Onboard electric equipment). If the failure only of temperature measuring instrument takes place, execute the checks stated in the following paragraphs.
5. If the arrow of the measuring instrument remains within the blue sector of a scale at the heated-up engine, disconnect an electrical wiring from CTS and ground the corresponding wire on the mass of a head of cylinders. If at inclusion of ignition of the shooter deviates, the sensor is faulty and is subject to replacement. If no changes in behavior of the measuring instrument happen, remove a combination of devices (see the Head Onboard electric equipment) and check for existence of conductivity on the site of a chain between the sensor and the measuring instrument. If conductivity takes place, therefore, the measuring instrument is faulty and is subject to replacement.
6. If the arrow of the measuring instrument constantly is in the red range of a scale, without reacting to cooling of the engine in any way, disconnect an electrical wiring from the sensor. If the arrow returns to the beginning of a scale at inclusion of ignition, it is necessary to replace CTS. Otherwise check the chain rest.

1. Partially merge cooling liquid (lower than the level of an arrangement of CTS), or prepare a suitable cap.

2. Disconnect an electrical wiring from CTS. Now it is necessary to define type of the sensor installed on your car. The sensor can have as free, or carving landing.

3. The sensor supplied with a carving just is turned out from the engine. Do not forget to remove a sealing washer.

4. The sensor of free landing is fixed by a special clip which should be taken previously.

5. Then the sensor is just taken from the nest.

6. In conclusion also remove a sealing ring.

1. On the sensor with screw landing replace a sealing washer, then screw the sensor on the regular place and strongly tighten it.
2. In case of the sensor with free landing establish on it a new sealing ring, then push assembly in a landing nest and record it a clip.
3. Connect an electrical wiring, then add necessary amount of cooling liquid in system.

2. The sensor represents a thermistor. The electronic control unit (ECU) of a control system of engine/injection of fuel gives supply voltage on the sensor and measures current, the sensor proceeding in a working chain which size is defined by thermistor temperature. The obtained information is used then among other entrance signals when determining the moment and duration of operation of injectors, installation of turns of idling, etc.
3. At violation of serviceability of functioning of a chain of the ECU sensor begins to ignore the signal developed by a thermistor, using instead of it the certain effective average value providing adequate functioning of under control systems. At the same time on an instrument guard the control lamp warning the owner of the vehicle about need of the address on car repair shop joins. Check of a condition actually of the sensor is possible only with use of the branded diagnostic reader of the Skoda company. In order to avoid risk of inactivation of ECU it is not necessary to make attempts to understand a situation by means of any other make-shifts.

The detailed description of the procedure of check of serviceability of functioning of system of preheat of the diesel engine is provided in the Part System of preheat of diesel engines of the Head Elektrooborudovaniye of the engine.

The sensor is united in the uniform block with CTS and is installed in the final branch pipe of a cooling path located in a forward part of a head of cylinders. The description of procedures of removal and installation of the sensor is given above.