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Pic. 9-5. Features of the electrical circuit 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 regulator; 10 - diagnostic block; 11 - speed sensor; 12 - adsorber purge valve; 13 - spark plugs; 14 - ignition module; 15 - block of the electronic control unit; 16 - fuse for the intake pipe heater; 17 - injection system fuse box; 18 - crankshaft position sensor; 19 - a combination of devices with a tachometer and a control lamp "CHECK ENGINE"; 20 - the main fuse block of the car; 21 - ignition relay; 22 - relay for turning on the electric fuel pump; 23 - relay of the electric heater of the inlet pipe; 24 - intake pipe heater; A - to the conclusion «plus» battery; B - to terminal «15» 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 regulator; 10 - diagnostic block; 11 - speed sensor; 12 - adsorber purge valve; 13 - spark plugs; 14 - ignition module; 15 - block of the electronic control unit; 16 - fuse for the intake pipe heater; 17 - injection system fuse box; 18 - crankshaft position sensor; 19 - a combination of devices with a tachometer and a control lamp "CHECK ENGINE"; 20 - the main fuse block of the car; 21 - ignition relay; 22 - relay for turning on the electric fuel pump; 23 - relay of the electric heater of the inlet pipe; 24 - intake pipe heater; A - to the conclusion «plus» battery; B - to terminal «15» ignition switch.
There are five fuses in the injection system wiring harness. Fuse 16 (for 50 A) installed in a separate box. It protects the intake pipe heater circuit. The remaining four fuses (15 A each) 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. Assignment of the injection system fuses
Fuse | Protected circuits |
1-2 | Relay for switching on the electric fuel pump (contacts). Electric fuel pump. Nozzle. |
3-4 | Oxygen concentration sensor. Speed sensor. adsorber valve. Relay (winding) turning on the intake pipe heater. |
5-6 | Controller. ignition module. |
7-8 | Spare |
In addition to fuses, there is also «fusible link» at the end of the red wire connected to the battery. This «fusible link» 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.