Fuel injection and ignition control system (VW Polo 3)

Contents: Table 4.2. Technical characteristics…↓ Table 4.3. Ignition system…↓

Table 4.2. Technical characteristics of the fuel injection and ignition control system

The arrangement of the fuel injection system components is shown in Fig. 4.24 a, b. The intake manifold is shown in Fig. 4.25. The high-pressure fuel line with injectors is shown in Fig. 4.26. The disassembled air filter is shown in Fig. 4.27. The arrangement of the ignition system components is shown in Fig. 4.28. The ignition system adjustment data and spark plug markings are given in Table 4.3.

Fig. 4.24 a. Location of fuel injection system components:
1 - Fuel pressure regulator; 2 - Oxygen sensor wiring connector (after catalyst); 3 - Intake manifold pressure sensor with intake air temperature sensor; 4 - Intake manifold; 5 - Nozzle; 6 - Oxygen sensor (after catalyst); 7 - Knock sensor; 8 - Throttle body; 9 - Crankshaft speed sensor; 10 - Brake pedal sensor; 11 - Brake light switch; 12 - Engine control unit; 13 - Ignition coil; 14 - Three-pin wiring connector for the crankshaft speed sensor; 15 - Exhaust gas recirculation valve together with exhaust gas recirculation potentiometer; 16 - Four- and six-pin wiring connectors for the oxygen sensor and the oxygen sensor heater before the catalytic converter; 17 - Coolant temperature sensor; 18 - Hall sensor; 19 - Oxygen sensor before catalytic converter; 20 - Solenoid valve of activated carbon filter.

Fig. 4.24 b. Location of fuel injection and ignition system components:
1, 20 - Traffic jams; 2, 5, 13, 36 - Bolts; 3 - Air filter; 4 - Wiring harness guide; 6 - High pressure fuel line with injectors; 7 - Intake manifold; 8 - From the electromagnetic valve of the activated carbon filter; 9 - Wiring connector, nine-pin, from the throttle body; 10 - From the brake booster; 11 - Gasket; 12 - From the exhaust gas recirculation valve; 14 - Crankshaft speed sensor; 15 - Oxygen sensor before catalytic converter; 16 - Four- and six-pin wiring connectors for the oxygen sensor and the oxygen sensor heater before the catalytic converter; 17 - Thermostat housing; 18 - Retainer; 19 - Sealing ring; 21 - Coolant temperature sensor; 22 - Wiring connector, four-pin, from coolant temperature sensor; 23 - Engine control unit wiring connector; 24 - Engine control unit; 25 - Support; 26 - Adapter for air intake duct; 27 - Crankcase ventilation tube; 28 - Incoming air heating; 29 - Wiring connector, four-pin, from the pressure sensor in the intake manifold with the temperature sensor of the inlet air; 30 - Wiring connector, two-pin, from knock sensor; 31 - Wiring connector, two-pin, from injectors; 32 - Vacuum tube; 33 - Fuel drain line; 34 - Fuel injection line; 35 - Seal.

Fig. 4.25. Intake manifold:
1 - Throttle body; 2, 6, 10 - Bolts; 3 - Gasket; 4 - Connecting flange; 5, 7 - Seals; 8 - Guide plate; 9 - Sealing rings; 11 - Intake manifold pressure sensor with intake air temperature sensor; 12 - Intake manifold; 13 - Vacuum tube.

Fig. 4.26. High pressure fuel line with injectors:
1 - Mounting plate; 2, 3 - Bolts; 4 - High pressure fuel line; 5 - Retainer; 6, 10 - Sealing rings; 7 - Injectors; 8 - Fuel injection line; 9 - Fuel drain line; 11 - Fuel pressure regulator; 12 - Vacuum tube.

Fig. 4.27. Air filter disassembled:
1 - Bolt; 2 - Cork; 3 - Crankcase ventilation tube; 4 - Upper part of the air filter; 5 - Filter element; 6 - Lower part of the air filter; 7 - Seals; 8 - Air intake housing with damper; 9 - Heated air supply pipe; 10 - Adapter; 11 - Connecting pipe.

Fig. 4.28. Location of ignition system elements:
1 - High voltage wire; 2 - Ignition coil (A - cylinder 1, B - cylinder 2, C - cylinder 3, D - cylinder 4); 3 - Ignition coil wiring connector; 4, 7 - Bolts; 5 - Knock sensor wiring connector; 6 - Knock sensor; 8 - Hall sensor wiring connector; 9 - Hall sensor; 10 - Sealing ring; 11 - Guide plate for high-voltage wires; 12 - Spark plug.