Electric motor 1 of the engine cooling system fan is switched on by the electronic control unit 4 of the injection system using relay P4 in the mounting block. Therefore, there is no fan electric motor switch sensor in the radiator.
There are four fuses in the injection system wiring harness. All of them, together with the relay, are combined into one unit installed under the glove compartment. The larger fuse 24 is rated for 50 A. It protects the intake manifold heater circuit. The other three fuses are rated for 15 A.
The purpose of these fuses is indicated in the table (the fuse numbers are indicated according to Fig. Electrical connection diagram of the injection system and the colors of the fuse blocks).
Purpose of injection system fuses
Fuse | Protected circuits |
20 (green) | Electronic control unit. Ignition module. |
18 (black) | Oxygen concentration sensor. Speed sensor. Evaporative canister valve. Relay (winding) for switching on the intake manifold heater. |
19 (red) | Electric fuel pump relay (contacts). Electric fuel pump. Injector. |
In addition to the fuses, there is also a "fuse link" at the end of the red wire that connects to the battery. This "fuse link" is made in the form of a piece of black wire with a cross-section of 1 mm², while the main red wire has a cross-section of 6 mm².
The text is on the website vazbook.ru