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Fig. 9-5. Features of the electrical equipment diagram of VAZ-21214 cars with central fuel injection:
1 - electric fuel pump with fuel level sensor; 2 - nozzle; 3 - oxygen concentration sensor; 4 - octane potentiometer; 5 - air temperature sensor; 6 - absolute pressure sensor; 7 - throttle position sensor; 8 - coolant temperature sensor; 9 - idle speed control; 10 - diagnostic socket; 11 - speed sensor; 12 - purge valve of the adsorber; 13 - spark plugs; 14 - ignition module; 15 - Electronic control unit socket; 16 - intake manifold heater fuse; 17 - injection system fuse box; 18 - crankshaft position sensor; 19 - instrument cluster with tachometer and indicator lamp "CHECK ENGINE"; 20 - main fuse box of the car; 21 - ignition relay; 22 - Electric fuel pump relay; 23 - Intake manifold electric heater relay; 24 - intake manifold heater; A - to the positive terminal of the battery; B - to terminal "15" of the ignition switch.
1 - electric fuel pump with fuel level sensor; 2 - nozzle; 3 - oxygen concentration sensor; 4 - octane potentiometer; 5 - air temperature sensor; 6 - absolute pressure sensor; 7 - throttle position sensor; 8 - coolant temperature sensor; 9 - idle speed control; 10 - diagnostic socket; 11 - speed sensor; 12 - purge valve of the adsorber; 13 - spark plugs; 14 - ignition module; 15 - Electronic control unit socket; 16 - intake manifold heater fuse; 17 - injection system fuse box; 18 - crankshaft position sensor; 19 - instrument cluster with tachometer and indicator lamp "CHECK ENGINE"; 20 - main fuse box of the car; 21 - ignition relay; 22 - Electric fuel pump relay; 23 - Intake manifold electric heater relay; 24 - intake manifold heater; A - to the positive terminal of the battery; B - to terminal "15" of the ignition switch.
There are five fuses in the injection system wiring harness. Fuse 16 (50 A) is installed in a separate housing. It protects the intake manifold heater circuit. The other four fuses (15 A each) are installed in a separate fuse box 17, located on the left side under the instrument panel. The purpose of these fuses is shown in Table 9-1.
Table 9-1. Purpose of the injection system fuses
| Fuse | Protected circuits |
| 1-2 | Electric fuel pump relay (contacts). Electric fuel pump. Injector. |
| 3-4 | Oxygen concentration sensor. Speed sensor. Evaporative canister valve. Relay (winding) for switching on the intake manifold heater. |
| 5-6 | Controller. Ignition module. |
| 7-8 | Spare |
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.