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Fig. 9-24. Wiring diagram of the engine control system with distributed fuel injection of VAZ-21 214-20 vehicles:
1 - coolant temperature sensor; 2 - throttle position sensor; 3 - mass air flow sensor; 4 - electromagnetic valve for purging the adsorber; 5 - injectors; 6 - spark plugs; 7 - ignition module; 8 - controller; 9 - idle speed control; 10 - instrument cluster with tachometer and CHECK ENGINE indicator lamp; 11 - Main fuse box of cars; 12 - APS status indicator; 13 - APS control unit; 14 - to the driver's door light switch; 15 - to the interior light; 16 - diagnostic socket; 17 - Electric fuel pump with fuel level sensor; 18 - Electric fuel pump relay; 19 - vehicle speed sensor; 20 - main relay; 21 - crankshaft position sensor; 22 - knock sensor; 23 - oxygen sensor; 24 - Electric fan relay; 25 - Electric fans; 26 - injection system fuse box.
1 - coolant temperature sensor; 2 - throttle position sensor; 3 - mass air flow sensor; 4 - electromagnetic valve for purging the adsorber; 5 - injectors; 6 - spark plugs; 7 - ignition module; 8 - controller; 9 - idle speed control; 10 - instrument cluster with tachometer and CHECK ENGINE indicator lamp; 11 - Main fuse box of cars; 12 - APS status indicator; 13 - APS control unit; 14 - to the driver's door light switch; 15 - to the interior light; 16 - diagnostic socket; 17 - Electric fuel pump with fuel level sensor; 18 - Electric fuel pump relay; 19 - vehicle speed sensor; 20 - main relay; 21 - crankshaft position sensor; 22 - knock sensor; 23 - oxygen sensor; 24 - Electric fan relay; 25 - Electric fans; 26 - injection system fuse box.
Three wires from the harness of the control unit are connected through a separate block to the low-voltage input of the tachometer in the instrument cluster, with a control lamp "CHECK ENGINE" and with the ignition switch plug "15".
There are four fuses in the ECU wiring harness. They are installed in a separate fuse block 26, located under the left front trim cover. The purpose of these fuses is shown in Table 9-2.
Table 9-2. Purpose of injection system fuses
| Fuse | Protected circuits |
| 1-2 | Electric fuel pump relay (contacts). Electric fuel pump. |
| 3-4 | Controller. |
| 5-6 | Main relay (contacts). Oxygen sensor. Speed sensor. Evaporative canister purge solenoid valve. Electric fuel pump relay (winding). Electric fan relay (winding). Controller. Mass air flow sensor. Injector harness. |
| 7-8 | Electric fan relays (contacts). Electric fans. |
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.
Electric motors for cooling system fans
To drive the fans of the engine cooling system, two DC electric motors with excitation from permanent magnets of the MP 8015 type are used.
The electric motors are switched on by the engine management system controller via a relay. When the engine is running, the relay is switched on if the coolant temperature exceeds 105°C and is switched off after the coolant temperature drops below 101°C.
Electric motors do not require maintenance and should be replaced with new ones in case of failure.
Data for checking the electric motor:
- Nominal shaft speed when the electric motor is loaded with an impeller, min⁻¹ — 2000-2200
- Current consumption at the specified load and rotation speed, A, no more than - 15