Attention! When the sensor plug is disconnected, a cold engine condition is simulated and when the ignition is turned on, the system performs a preheating.
2. Remove the glow plug caps.
3. Connect one lead of the voltmeter to one of the spark plug terminals and the other to the ground (-) of the vehicle.
4. Turn on the ignition and check the voltage. The voltmeter should show the battery voltage.
Otherwise, find the break in the power wire and fix it.
(The original article is available at: www.VWMANUAL.ru)
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