Warning! Before starting work, read the precautions for repairing the engine management system (see "Precautions when repairing the engine management system").
To complete the work you will need:
- multimeter (in voltmeter and ohmmeter mode);
- the wire (1.5-2 m);
- insulating tape.
Execution sequence
1. We prepare the car for work (see "Preparing the car for maintenance and repair"), turn off the ignition.
2. On engines 2112, 21124 and 21114 remove decorative trim (see "Decorative overlay of the engine - removal and installation").
3. Disconnect the pads (1) And (2) injector wiring harness on an 8-valve engine.
Note. On a 16-valve engine, the operation is as follows:
4. Turning on the ignition, use a voltmeter to measure the voltage at the supply terminal E of the block (2) wiring harness, which must be at least 12 V (conclusions are indicated by letters on the block, "negative" The instrument probe must be connected to "mass" engine).
Warning! Turn off the ignition after the voltage measurement is completed.
Comment. If the voltage is not supplied to the block or it is less than 12 V, then the battery is discharged, the power circuit is faulty, or the computer is faulty.
5. We check the electrical resistance of the injectors, for which we alternately measure the resistance between terminal E and the remaining four terminals of the block with an ohmmeter (2). The output of the block, marked with the letter B, corresponds to the injector of the first cylinder, and the outputs C, G and F correspond to the injectors of the second, third and fourth cylinders, respectively. In serviceable injectors, the resistance should be approximately 13 ohms.
5. Using two wires directly from the battery, we feed the pads to the terminals (2) voltage 12 V - terminal E is connected to the positive terminal of the battery, and terminals B, C, G and F are in series with the negative terminal of the battery. A serviceable nozzle should have a characteristic click when the valve is opened.
6. Replace defective nozzles (see "Fuel rail engine 2112 (1,5i 16v) - removal, disassembly, assembly and installation", or "Fuel rail engine 2111 (1,5i 8v) - removal, disassembly, assembly and installation", or "Fuel rail engine 21124 (1,6i 16V) - removal, disassembly and installation", or "Fuel rail engine 21114 (1,6i 8V) - removal, disassembly and installation").