Attention! If the engine does not start well, although the preheat indicator light indicates normal operation of the preheater, one of the cylinders 2-4 glow plugs may be defective. In this case, also check the spark plugs.
Remove the cover from the heating control relay. To do this, on the input side, drop the wire under the cover and tilt it up. The heating control relay is located in the engine compartment on the left fender.