8.12.4. Possible malfunctions of control devices, their reasons and methods of elimination

Cause of defect
Elimination method
Constantly the safety lock of devices fuses
The diode of protection of devices is punched
Replace the damaged diode
The arrow of the index of temperature of cooling liquid constantly is in the beginning of a scale
1. The device is damaged
1. Replace the device or a combination
devices
2. The device sensor is faulty
2. Replace the sensor
3. Wires are damaged or oxidized
their tips
3. Check wires, restore
connections
The arrow of the index of temperature of cooling liquid constantly is in a red zone
1. The device is damaged
1. Replace the device or a combination
devices
2. The device sensor is faulty
2. Replace the sensor
3. The wire going to the sensor will be closed
on weight
3. Check, eliminate short circuit
The arrow of the index of level of fuel constantly is in the beginning of a scale
1. The device is damaged
1. Replace the device or a combination
devices
2. Wires are damaged or oxidized
their tips
2. Check wires, restore
connections
3. The sensor is damaged:
3. Do the following:
a) break of the flexible tire of the sensor
a) solder the tire or replace the sensor
b) break of a winding of the resistor
b) replace the sensor
c) weak contact of a slip ring
resistor
c) turn in contact
d) the float is untight
d) replace a float
The arrow of the index of level of fuel constantly is in the end of a scale
1. The device is damaged
1. Replace the device
2. The flexible tire of the sensor is closed with
fuel intake tube
2. Unbend the tire
3. Wire of connection with the sensor
it is closed on weight
3. Check, eliminate short circuit
The arrow of the index of level of fuel comes back by the beginning of a scale at a full tank
The limiter is incorrectly installed
the float course (the winding comes to an end
resistor)
Turn in the limiter
on 1-2 mm down
The arrow of the index of level of fuel moves jumps and often falls by the beginning of a scale
1. Weak contact of the resistor of the sensor
slip ring
1. Turn in a slip ring
2. Break of a winding of the resistor of the sensor
2. Replace the sensor
Constantly the control lamp of a reserve of fuel burns
1. Short circuit of a wire of the sensor with a weight
1. Check, eliminate short circuit
2. Short circuit of the flexible tire of the sensor with
fuel intake tube
2. Unbend the tire
Any control lamps do not work
1. The lamp fused
1. Replace a lamp
2. Bad contact of a lamp in the boss
2. Restore contact
3. Contacts of the sensor were oxidized
3. Smooth out contacts of the sensor
4. The lamp sensor is faulty
4. Replace the sensor
5. Break in wires, oxidation of tips of wires
5. Replace the damaged wires, smooth out tips
The control lamp of pressure of oil burns constantly or dies away only at big turns of the engine
1. Low pressure of oil
1. Check the engine
2. Short circuit of a wire of the sensor on weight
2. Check, eliminate short circuit
3. The sensor is faulty
3. Replace the sensor
The speedometer does not work
1. Nuts of fastening of tips of a flexible shaft of the drive are not tightened
speedometer
1. Check, tighten nuts
2. Break of a flexible shaft of the drive
2. Replace a flexible shaft
3. The speedometer mechanism is damaged
3. Replace a speedometer or
combination of devices
Noise of a flexible shaft of the drive of a speedometer
1. The cover of a flexible shaft of the drive (dents, excesses, etc.) is deformed
1. Replace a flexible shaft
2. Installation of a flexible shaft is executed with
bend radiuses less than 100 mm
2. Correct installation of a flexible shaft