Disconnect the wires from the glow plugs. Connect one lead of the voltmeter to the positive terminal of the battery, and apply the other lead to each plug in turn.
If the LED lights up, the spark plug is OK, if not, it is faulty and must be replaced. The tightening torque for spark plugs is 20 Nm.
Caution! Do not exceed the specified torque, otherwise the gap between the filament and the thread will disappear, and the spark plug will fail prematurely.
Connect the wires to the glow plugs.
Checking the glow plug relay
Remove the glow plug relay (relay N8). It is located in the relay box in the engine compartment.
Apply the tester to terminal 30. Turn on the ignition. The LED of the device should light up, otherwise check the battery voltage.
Apply the tester to terminal 86. Turn on the ignition. The LED of the device should light up, otherwise check the voltage at the ignition switch.
If the tester LED is blinking, check the glow plug wires for a break and replace them or the relay if necessary.
Glow plugs with burnt tips
The tips of glow plugs burn out most often due to malfunctioning injectors.
If spark plugs with burnt tips are found, they must be replaced, and the injectors must be checked for spray quality, injection pressure and tightness (in the workshop).
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