Order of execution
1. Connect an ammeter to the glow plug circuit.
2. Disconnect the wire from the coolant temperature sensor.
3. Turn on the glow plugs with the ignition key for a maximum of 15 seconds.
4. Measure the current drawn by the glow plugs. It should be about 60 A.
5. The current passing through one candle is about 12 A. Therefore, if the measured value is 48 A, then one candle is damaged, 36 A - two candles, 24 A - 3 candles, 12 A - 4 candles. If the ammeter shows zero, i.e. lack of current consumption, this indicates a malfunction of all candles.
6. To identify a faulty spark plug, disconnect the wire and conductor rail from the glow plugs. Connect the probe lead to «positive» battery terminal and attach a tester to each candle in turn, as shown in the figure. If the probe lamp lights up, then the candle is working, if not, it is damaged and needs to be replaced. Screw in the new spark plug and tighten to 30 Nm (3.0 kgf·m). Do not exceed the specified tightening torque to avoid damage to the spark plug. Connect the busbar and wire.
7. If the spark plug checks show no malfunction and the engine does not start well, visually check the spark plugs as they heat up. To do this, remove the nozzles and observe the operation of the candles through the holes for the nozzles. If candles with burnt tips are detected, as in the figure, this means interruptions in the operation of the nozzles. Replacing such candles is not enough; in addition, it is necessary to check the nozzles for injection pressure and tightness. When doing this, you should also make sure that the fuel flow is dense and well atomized. It is recommended to check the operation of the injectors at a service station.
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