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 1. Disconnect a negative wire from the battery.   2. Disconnect an electrical wiring from the sensor switch of disconnection of a chain of a starter.   3. Remove the sensor switch.   4. Check coupling pedal course size, in case of need make necessary adjustment (see the Section Removal, service, installation and adjustment of a pedal of coupling).  
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 5. Measure sensor switch plunger vystupaniye size in its extreme situation, - if the result differs from value of 2+1.5 mm, replace the sensor switch.   | 
 
 
6. Check conductivity between its plugs No. 1 and No. 2 of the disconnected sensor switch. At the released coupling pedal the result of measurement has to make more than 1 megohm, at squeezed out, - less than 1 Ohm.   7. The faulty sensor switch is subject to replacement.   |