Using an LED tester to check the performance of glow plugs
If the LED lights up, then the glow plug is good. If the LED does not illuminate, the spark plug is bad and needs to be replaced.
Verification conditions
The voltage of the car's on-board network must be at least 11.5 V.
The engine control device must be in good condition.
The fuses in the voltage supply circuit to the glow plugs must be good.
Examination
1. Switch off the ignition.
2. Disconnect the electrical connectors from the glow plugs.
3. Connect the control LED to the positive terminal of the battery and connect the second terminal of the LED to the glow plugs in turn, see fig. Using an LED probe to check the performance of glow plugs.
4. If you have a high current ammeter, connect it between the positive battery terminal and the glow plug terminal. Measure the current drawn by the glow plug. If the current drawn by the plug exceeds 15A, then the glow plug is faulty.
5. Unscrew the glow plugs.
6. Check each glow plug for mechanical damage. Burnt or shattered glow plug tips can be from poor injector atomization. If there is such damage, the fuel injectors must be checked and, if necessary, replaced.
The performance of glow plugs can be checked by applying 12 V to them. At the same time, they should heat up evenly and within the required time interval. In doing so, the following precautions must be observed:
- hold the glow plug with a special clip or pliers;
- the electrical supply circuit of the glow plug must have a fuse;
- after checking, the glow plug should cool down for a few minutes.
A glow plug in good condition heats up to a reddish working tip within 5 seconds. With longer heating or heating in the middle part, and not at the end of the candle, the candle is faulty and must be replaced.
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