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Toyota Camry1992-1997 of releaseRepair and car operation |
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Kamri's Toyota + General data + 1. Maintenance + 2. Engine + 3. Six-cylinder V6 engines + 4. Major maintenance of engines + 5. Cooling and heating + 6. Fuel system + 7. Ignition system + 8. Toxicity fall + 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. Aerial 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 an 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. Electric equipment schemes |
15.4.4. Detection of bad grounding
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 manner that only the positive wire, thus a current approaches to them comes back to the accumulator through body metal. It means that fastening of an element of electric equipment and a body are a 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 of any else included element of electric equipment 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 пет 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 disconnect the accumulator and to connect one of щупов an ohmmeter to reliably earthed element. Connect another щуп to a wire пли to connection with a body which is necessary for checking. Resistance shown by an ohmmeter should be equal to zero; if is not present, check connection as follows. If you assume absence of grounding, disassemble connection and clear a site of a body and the wire plug (or a surface of grounding of an element) to pure metal. Carefully remove all traces of dirt, then by means of a knife remove all paint so that reliable contact of two metal surfaces turned out. At assembly, reliably tighten socket fastening; at connection of the plug of a wire, establish a washer with the jagged edges between the plug and a body surface for ensuring reliable connection. At connection, prevent emergence of corrosion in the future, having put a layer of vaseline or silicone greasing. |
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