Glow plugs — check

When checking the glow plugs, the battery must be fully charged, its voltage must be at least 12 V. The engine is cold.

At temperatures above 55°C, disconnect the coolant temperature sensor connector.

The power supply test can be carried out without removing the glow plugs. For this:

Connect a voltmeter to the current rail of the glow plugs and to the body of the glow plug.

Turn on the ignition and warm up the engine (preheat). The voltmeter should show battery voltage for a few seconds (9 V and above).

After starting the engine, leave it to idle. During and after starting for several minutes, the voltmeter should indicate battery voltage (9 V and above).

If there is no indication on the device, the preheat control unit must be checked.

Checking glow plugs is as follows:

Check and clean the current bar from corrosion or replace it.

Check for visible damage to the glow plug.

Disconnect the connection cable and current bar.

Measure the resistance between the glow plug contact and the spark plug body. Required value: about 0 ohm. If the resistance is infinity, replace the spark plug.

Also check all glow plugs.

Connect wire and bus bar.

If it was disabled, reconnect the coolant temperature sensor connector.

If the engine continues to start poorly and no defect is found, remove the injectors and observe the glow plugs through the holes.

Glow plugs with burnt heating rods are not simply replaced. In this case, it is also necessary to check the injection nozzles for injection pressure and tightness.