Fuel gauge sensor
Sensor type BM-168. It is installed in the fuel tank and fastened to it with screws.
The sensor has a variable resistor made of nichrome wire. The moving contact of the resistor is controlled by a float lever. At the short end of this lever there is also a movable contact that turns on the fuel reserve indicator lamp if 4-6.5 liters of gasoline remain in the tank.
With an empty tank, the resistance of the sensor should be 315-345 ohms, with a half-filled tank - 108-128 ohms, and with a full tank - less than or equal to 7 ohms.
Coolant Temperature Gauge Sensor
Sensor type ТМ-106 It is wrapped in the cylinder head on the left side of the engine.
A thermistor is installed in the sensor, which changes its electrical resistance depending on the temperature of the coolant. The data for checking the sensor are given in Table. 7-8.
Table 7-8. Data for checking the coolant temperature gauge sensor
Temperature, | Voltage supplied to the sensor, V | Sensor resistance, Ohm |
30 | 8.0С | 1350-1880 |
50 | 7.60 | 585-870 |
70 | 6.85 | 780-390 |
90 | 5.80 | 155-196 |
110 | 4 70 | 87-109 |
Oil pressure gauge sensor
Type of sensor MM393A It converts the pressure in the engine lubrication system into the resistance of the electrical circuit. The sensor is installed on the engine block on the left side. The data for checking the sensor are given in Table. 7-9.
Table 7-9.
Pressure, MPa (kgf/cm2) | Sensor resistance, Ohm |
0 (0) | 290-320 |
0.4 (4) | 103-133 |
0.6 (6) | 55-80 |
0.8 (8) | 0-15 |
Oil pressure warning light sensor
The MM-120 type sensor is mounted on the engine block on the left side.
Sensor contacts should close and open at a pressure of 20-60 kPa (0.2-0.6 kgf/cm2).
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 behind the instrument panel.
The number of cycles per minute of turning on and off the relay-breaker at a voltage of 10.8 to 15 V and a temperature of -40°C to + 40°C should be in the range of 60-120. The resistance of the breaker winding is 26 ohms.