1. Check a safety lock of the module of management of heating. The safety lock is in the block of safety locks, in a motive compartment, at the left depreciation rack.
2. Separate temperature relay electrical wiring socket.

I will corrode temperature relay

3. Attach the voltmeter between the central conclusion of a glow plug and weight.

Connection of the voltmeter

4. Turn the ignition key in situation II. The control lamp of the device of preheat has to light up approximately on 3.5 with, and the voltmeter has to show existence tension during about 7 pages. Otherwise check according to the electric circuit of the relay of preheat or the feeding wires.
5. Connect temperature relay socket.