On the 55 kW turbodiesel, the glow plug timing control unit (1) is attached to an additional adapter in the upper half of the central unit. The glow plug relay (2) is located here on plug N12.
Check conditions: glow plug relay is OK: check it (see previous section). The driver's door must not be opened during and before the test, since the contact switch in the door also stops the glow process and this will distort the measurement results.
Unscrew the red and white cable from the strip fuse to the spark plug on the fuse box and put it aside.
Connect the test lead to the red and white wire still attached to the fuse.
Connect the free wire of the test lamp to ground.
Remove the temperature sensor connection plug from the front of the radiator hose fitting on the cylinder head. Leave the plug hanging.
Turn the ignition key to the "pre-glow" position and watch the indicator lamp: it should light for about 9 seconds before the indicator lamp on the instrument panel goes out.
After that it burns for about 10 more seconds. (ready to launch).
Turn the ignition key back to the "off" position and then back to the "pre-glow" position.
After the pre-glow indicator goes out, start the engine and let it idle. After the engine starts, the indicator lamp should remain lit for about 180 seconds (subsequent heating).
Another check: turn the ignition key to the "off" position and then to the "pre-glow" position.
In the removed temperature sensor plug, extend the contact of the blue-white wire and connect it to ground.
The indicator light should go out immediately.
Works as described above; the control unit and wires are in order. If, despite this, incorrect operation of the pre-heating system is detected, then the temperature sensor may be faulty (the check is described in the next section).
Does not work as described above: remove the left lower trim panel of the instrument panel. Check the wires according to the electrical equipment diagram. If they are OK, then replace the control device of the automatic glow timer.
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