Toyota Camry

1992-1997 of release

Repair and operation of the car



Kamri's Toyota
+ General data
+ 1. Maintenance
+ 2. Engine
+ 3. Six-cylinder V6 engines
+ 4. Capital repairs of engines
+ 5. Cooling and heating
+ 6. Fuel system
+ 7. System of ignition
+ 8. Toxicity decrease
+ 9. Transmission
+ 10. Automatic transmission
+ 11. Coupling and power shafts
+ 12. Brake system
+ 13. Suspension bracket
+ 14. Body
- 15. Electric equipment
   15.2. General information
   15.3. Electric chains
   - 15.4. Detection of not closed chain
      15.4.2. Detection of a rupture of a chain
      15.4.3. Detection of a source of short circuit
      15.4.4. Detection of bad grounding
   15.5. Safety locks
   15.6. Relay
   + 15.7. Multipurpose switches of a steering column
   + 15.8. Ignition lock
   15.9. Switch of a heater of back glass
   15.10. Check of a heater of back glass
   15.11. Radio receiver
   15.12. Loudspeakers
   15.13. Antenna
   15.14. Replacement of bulbs of headlights
   15.15. Adjustment of light of headlights
   15.16. Headlight
   + 15.17. Replacement of bulbs of an incandescence
   + 15.18. Screen wiper engine
   15.19. Combination of devices
   15.20. Sound signal
   15.21. System cruise control
   15.22. Window regulators with the electric drive
   15.23. System of the central blocking of locks
   15.24. Rear-view mirrors with the electric drive
   15.25. Safety airbag
   + 15.26. Schemes of electric equipment





15.4.4. Detection of bad grounding

GENERAL INFORMATION

The negative plug of the accumulator is connected to "weight" — to metal of a body, the engine or a transmission thus many elements of electric equipment are connected in such a way that only the positive wire approaches them, thus current comes back to the accumulator through body metal. It means that fastening of an element of electric equipment and a body are part of an electric chain. Thereof, the bad or rusted fastening can cause refusal of work of an element or lead to its unstable or bad work. In particular, bulbs can burn with dim light (especially if in a point of grounding of this bulb grounding any else the included electric equipment element is carried out), electric motors can slowly work, and also work of one chain can have effect imperceptible at first sight on work of other chain. Do not forget that on many cars grounding wires between some elements, such as engines/transmissions and a body, that is in those places where pt direct contact between metal elements, because of soft rubber fastenings or a paint coat are used.

For check of reliability of grounding of an element, it is necessary to switch-off the accumulator and to connect one of ohmmeter probes to reliably grounded element. Connect other probe to a pla wire to connection with a body which needs to be checked. Resistance shown by an ohmmeter has to be equal to zero; if is not present, check connection as follows.

If you assume lack of grounding, investigate connection and clear a site of a body and the plug of a wire (or a surface of grounding of an element) to pure metal. Carefully remove all traces of dirt, then by means of a knife peel all paint so that reliable contact of two metal surfaces turned out. At assembly, reliably tighten fastening of the socket; at connection of the plug of a wire, establish a washer with rough edges between the plug and a surface of a body for ensuring reliable connection. At connection, prevent emergence of corrosion in the future, having put a layer of vaseline or silicone greasing.