Checking the voltage supply
Connect a test lamp between the glow plug of the fourth cylinder and «weight» car.
Turn the ignition key to position II. At the same time, the control lamp should light up. If the lamp does not light up, then you need to check the voltage supply circuit in accordance with the electrical circuit.
Attention: 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.
Attention: This will erase the data of the electronic memory units. See instructions in 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 conductive rail for the glow plugs.
Connect a voltage tester to the positive battery terminal and attach the other tester lead to each glow plug in turn. If the probe LED lights up, then there is contact and the glow plug is OK.
LED does not light up: The glow plug is defective and needs to be replaced. Spark plug tightening torque 30 Nm.
Caution: The tightening torque must not be exceeded as in this case, the annular gap between the glow rod and the threaded part will be reduced, and the glow plug will fail prematurely. If the glow plug burns out, follow the instructions (see below).
Connect the wire for the bus bar. Tighten nuts to 5 Nm.
Connect the negative cable to the battery. Set the hours and enter the required codes.
Glow plugs with burned out glow plugs
Burnt out glow plugs often lead to injector damage. Such damage should not be limited to repair by replacing the glow plugs.
If similar glow plugs are found during troubleshooting (arrow), it is not enough just to replace them. It is also necessary to check the injectors for the opening pressure and density (In workshop).