Checking the power supply circuit of gasoline engine injectors (Skoda Fabia 6Y)

Before carrying out the check, make sure that fuse #35 has not blown, the wire connecting the engine to the ground has not broken or oxidized, and the battery is charged (minimum voltage 11.5 V), the fuel pump relay is not faulty. For 1.4L, 55 and 74 kW engines, also check that the crankshaft speed sensor and camshaft position sensor are not faulty.

1. Remove the upper engine cover (see subsection 2.1).

2. For 1.4L, 55 and 74 kW engines, disconnect the wiring harness from the ignition module.

3. Disconnect the connectors with wires from the injectors.



4. Connect an electric voltage indicator with a LED to the contacts of connector 1, disconnected from injector 2 of the first cylinder (3 – voltage indicator with LED).

5. Turn the engine over with the starter; the LED should flash. This means that power is supplied to the injector. Check the remaining injectors in the same way.





6. If when cranking the engine the diode does not flash, connect a voltage indicator to terminal 1 of the connector (2 – second terminal), disconnected from the injector of the first cylinder, and to ground (a – engines 1.0 l, 37 kW and 1.4 l, 50 kW; b – 1.4 l, 55 and 74 kW engines). Turn the engine with the starter, the LED should flash; if it does not blink, check the wires for breaks and short circuits. Check the remaining injectors in the same way.

7. If there is no break in the wires, check the resistance of the injectors. To do this, connect an ohmmeter to the injector contacts and measure the resistance. For 1.0L, 37 kW and 1.4L, 50 kW engines it should be 14–20 Ohm; for 1.4 L, 55 and 74 kW engines – 14–17 ohms (at 20°C, when the engine is warm, the resistance is approximately 4–6 ohms higher). If the resistance differs from the specified value, replace the injectors.