Contents: Checking the voltage supply ⇓ Checking/replacing glow plugs ⇓ Glow plugs with burnt-out glow rods ⇓
When difficulties arise when starting the engine, you first need to measure the compression in the engine. If its value is very low, the engine will not start at low temperatures. Measuring compression is described in the chapter "Engine".
Checking the voltage supply
Connect a test lamp between the glow plug of the fourth cylinder and the vehicle ground.
Turn the ignition key to position II. The control lamp should light at the same time. If the lamp does not light, then the voltage supply circuit must be checked in accordance with the electrical equipment diagram.
Caution: The ignition key must not remain in position II for more than 15 seconds.
Checking/replacing glow plugs
Disconnect the negative cable from the battery with the ignition off.
Note: This will erase the data in the electronic memory units. See the instructions in the chapter "Electrical equipment".
Unscrew the bolt, disconnect the glow plug wire from the holder (4) and insulate it with electrical tape. (5 - vacuum pump).
Remove the connecting wire and the glow plug busbar.
Connect the voltage tester to the positive terminal of the battery and apply the other lead of the tester to each glow plug in turn. If the LED of the tester lights up, then there is contact and the glow plug is OK.
The LED does not light: the glow plug is faulty and needs to be replaced. The tightening torque of the glow plug is 30 Nm.
Caution: The tightening torque must not be exceeded, as this will reduce the annular gap between the glow rod and the threaded part, and the glow plug will fail prematurely. If the glow rod burns out, pay attention to the instructions (see below).
Connect the busbar wire. Tighten the nuts to 5 Nm.
Connect the negative cable to the battery. Set the clock values and enter the required codes.
Glow plugs with burnt-out glow rods
Burnt-out glow plug rods often cause damage to the injectors. Such damage should not be limited to replacing the glow plugs.
If such glow plugs (arrow) are detected during fault diagnostics, it is not enough to simply replace them. It is also necessary to check the injectors for the opening pressure and density (in the workshop).