Check preheating

Test conditions

Power to the vehicle must be not less than 11.5 V.

The engine management system has to be in order.

The fuses in the voltage supply to the glow plugs are undamaged.

Checking procedure

Switch off the ignition.

Disconnect the electrical connector from the coolant temperature sensor. The system acts as an engine control when the engine is cold and when the ignition it will be preheating.

Disconnect the electrical connectors from the spark plugs.

Connect the LED tester to the positive battery terminal and the second terminal of the series with the glow plugs (Fig. 5.26). If the LED is lit, the glow plugs are OK. If the LED is not lit the probe, so that the candle should be replaced.

To release the glow plug requires a wrench 3220.

Tightening torque of the glow plug 15 Nm.

Check glow plugs

Check each spark plug for mechanical damage. Burned or destroyed tips of the glow plugs indicate a bad fuel injector spray. In this case, check the nozzle and replace if necessary.

When the glow plugs no mechanical damage, check their electrical resistance, which should be less than 1 ohm.

The efficiency of the glow plugs can be checked by giving them the voltage of 12 V. In this case, they must be heated uniformly for the desired time interval. It is necessary to comply with warnings:

1. Hold the glow plug clip or special pliers.

2. The electric power supply circuit glow should have a fuse.

3. After checking the glow plug should be cooled for a few minutes.

Functioning glow plug is heated to a lower part of the redness for 5 seconds. For longer heating or not heating the bottom and in the middle part of the candle is faulty and should be replaced.