Checking glow plugs
1. Unscrew the glow plug cables.
2. Connect an ohmmeter to each spark plug in turn and check if current flows between the cylinder block and the spark plug contact.
3. If no current flows, the glow plug is defective and must be replaced.
4. Unscrew the faulty spark plug. Insert new spark plug and tighten firmly 20 Nm.
Attention! The tightening torque must not be exceeded, otherwise the heat core will be damaged and the spark plug will fail prematurely. Be careful not to get oil or fuel on the spark plug. Follow instructions for burnt cores.
5. Install cables and tighten firmly 20 Nm.
Attention! If no fault is found, although the engine does not start well, visually check the glow plugs when they are glowing. To do this, remove the nozzles and observe the glow plugs through the holes.
Candles with burnt cores
Burnt cores are often the result of injector malfunctions. Such damage cannot be caused by faults in or on the glow plugs. If glow plugs with similar damage -arrow- are found, it is not sufficient to simply replace them. You should also check the spray pressure and the tightness of the nozzles (performed 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 must be 13 ohm.
4. If the value is not correct, the relay must be replaced.