Checking glow plugs
Caution: First check the spark plug fuse plate for damage (cracks), firm seating and reliable contacts, if necessary, clean the contacts, tighten the screws or replace the fuse. The fuse plate is located in the relay box.
Test condition: engine cold (ambient temperature), the battery is fully charged, the battery voltage is at least 11.5 V.
Checking current consumption
To check the current consumption of an individual candle, an indirect ammeter is used in the workshop. The probe is connected to an insulated wire and measures the current value by means of induction.
Connect the probe, if any, to the glow plug wire.
Disconnect the engine temperature sensor.
Engine 1.6L:
Switch on the ignition, preheat the engine for at least 15 seconds and measure the current consumption. Should be 48 A.
Attention: The current consumption after stabilization is 12 A per spark plug. If the current consumption is:
- 36 A - 1 candle is faulty,
- 24 A - two,
- 12 A - three,
- 0 A - all candles are faulty.
1.9L engine:
Warm up, start the engine and let it idle.
During the work of the glow (120 seconds) Measure the current consumption while the engine is running.
- Should be 40 A
- At 30 A - 1 candle is faulty.
- At 20 A - 2 candles are faulty.
- At 30 A - 3 candles are faulty.
- At 30 A - all candles are faulty.
Checking glow plugs
Remove the connection cable and the current bus of the candles.
Connect a voltage tester to the battery positive and connect to each spark plug in turn.
If the LED lights up, the spark plug is good.
If the LED does not light up, the spark plug is faulty, replace it. Torque: 30 Nm.
Attention: the tightening torque must not be exceeded, as otherwise, the ring between the glow plug and the threaded part will be crushed and the candle will fail prematurely.
Connect current cable.
Connect temperature sensor cable.
Attention: If no malfunctions are found, and the engine does not start well, visually check the spark plugs with the heating turned off. To do this, remove the nozzles and inspect the candles through the holes.
Checking the glow plug relay
Remove relay #10 in the relay box.
Connect voltage tester to terminal 30 (terminal 48 in relay socket) and mass. The LED should light up, otherwise replace the relay board.
Connect voltage tester to terminal 15 (terminal 46 in relay socket) and mass. Turn on the ignition. The LED should light up, otherwise replace the relay board.
If the LED is on, check the red/white wire from the spark plugs to the relay board for an open, replace if necessary. Otherwise, replace the relay.
Glow plugs with burnt electrodes
The reason for the burning of the electrodes of the glow plugs is often a faulty injector.
If glow plugs with this kind of damage -arrow- are found, they cannot be limited to replacing them. It is necessary to check the injectors for injection pressure and density.
In this case, special attention should be paid to the fact that the jet at short, fast cycles (4-6 cycles/sec) interrupted and sprayed well.
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