Coolant Temperature Gauge Sensor
A thermistor is installed in the sensor, which changes its resistance depending on the temperature of the coolant. The sensor test data is shown in Table 7-7.
Table 7-7. Data for checking the coolant temperature gauge sensor
Temperature,°С | Voltage supplied to the sensor, V | Sensor resistance, Ohm |
30 | 8 | 1350-1880 |
50 | 7,6 | 585-820 |
70 | 6,85 | 280-390 |
90 | 5,8 | 155-196 |
110 | 4,7 | 87-109 |
Oil pressure warning light sensor
The sensor is mounted on the cylinder block. Sensor contacts should close and open at a pressure of 20-60 kPa (0.2-0.6 kgf/cm2).
Fuel level sensor
The sensor is installed in the fuel tank and fastened to it with nuts. The sensor has a variable resistor made of nichrome wire. The moving contact of the resistor is moved by a lever with a float. At the short end of this lever there is also a movable contact that turns on the fuel reserve indicator lamp if there are 4-6 liters of gasoline left in the tank.
When the tank is empty, the resistance of the sensor should be (250±12) Om, with the tank half full - (66±6) Ohm, and with a full tank - (20±3) Ohm.
Relay-interrupter of a control lamp of a parking brake
The RS-492 relay-breaker is designed to produce intermittent burning of the parking brake warning lamp. It is suspended on wires on the left side under the instrument panel.
The number of cycles per minute of switching on and off the relay-breaker at a voltage of 10.8 to 15 V and a temperature of -40 to +40°C should be within 60-120. The resistance of the breaker winding is 26 ohms.
Since 1995, the relay-breaker RS-492 has not been used on cars. Therefore, when the vehicle is braked with the parking brake, the parking brake indicator lamp lights up permanently.