14.4. The relay - the general information and check of serviceability of functioning
General information
For giving of power supply or a signal of management on some of consumers of the electric power in the car (such as components of system of injection of fuel, a horn, a starter, the cooling system fan(s), fog lights and so forth) relays are used. Actually the relay represents the electric key providing short circuit of VV of a contour on NV to a signal. In case of a relay exit out of operation there is a refusal of functioning of the corresponding consumer. The most part of the relay is placed in located under the dashboard and in a motive compartment of the car assembly blocks. The description of check of serviceability of functioning of the relay is given below. The failed relays are subject to replacement.
Check
If it is not possible to find out a way of turning on of the relay in the corresponding electric contour according to schemes of electric connections (see the Section of the Scheme of electric connections), it is necessary to remember that approach to check of any relay in principle is identical in all cases.
In the majority of the relay the contour of management is always connected to two of contact plugs. When giving on these NV plugs of tension current begins to circulate on a winding of management of the relay therefore there is a short circuit of big contacts of a working contour of the consumer of the electric power. Other plugs are plugs of working (VV) of a contour.
For the purpose of simplification of identification of plugs of the relay explanatory marking with the image of the scheme of connection of keys is usually applied on its case.
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The constructive scheme of the typical 4-contact relay with numbering of plugs and planimetric connections |
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The constructive scheme of the typical 5-contact relay with numbering of plugs and planimetric connections |
PERFORMANCE ORDER |
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