Checking glow plugs
1. Unscrew the glow plug cables.
2. Connect an ohmmeter to each spark plug in turn and check whether current flows between the cylinder block and the spark plug contact.
3. If no current flows, the glow plug is faulty and must be replaced.
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4. Unscrew the faulty spark plug. Insert a new spark plug and tighten it with force 20 Nm.
Caution! The tightening torque must not be exceeded, otherwise the thermal core will be damaged and the spark plug will fail prematurely. Make sure that no oil or fuel gets on the spark plug. Follow the instructions for burnt cores.
5. Install the cables and tighten them firmly 20 Nm.
Attention! If the fault is not found, although the engine starts poorly, visually check the glow plugs during glow. To do this, remove the injectors and observe the glow plugs through the holes during glow.
Candles with burnt cores
Burnt cores are often the result of faulty injectors. Such damage cannot be caused by defects in or on the glow plugs. If glow plugs with such damage are found -arrow-, it is not enough to simply replace them. The spray pressure and tightness of the injectors should also be checked (is done in the workshop).
Checking the glow plug relay
1. Disconnect the plugs from the glow plug relay.
2. Connect the relay to the battery using two auxiliary wires.
3. Connect an ohmmeter and measure the resistance between the two terminals.
The resistance should be equal 13 Ohm.
4. If the value does not match the required value, the relay must be replaced.