Checking for voltage and resistance
1. Check the Hall sensor.
2. Disconnect the plug from the cold start valve.
3. Check for voltage at all injection valves. To do this, connect the LED indicator to the plug (1). Turn on the starter. The LEDs should flash.
4. If the LEDs are lit without blinking, replace the ground (-) wire from the battery to the gearbox and the Digifant control unit.
5. The LEDs do not flash or light up. Connect the plug (1) to the plug connection (2).
6. Find and fix the break in the wiring between the valves and the control unit. Check the electrical part of the injection system at a service station. The control unit may need to be replaced.
7. If the ignition is on, turn it off.
8. Check the resistance of all injection valves at connection (2). For the required value, see subsection 2.18.8.
Attention! If the measured resistance does not correspond to the required value, then for a 4-cylinder engine, the measured value can be used to determine the number of faulty injection valves. For a 5-cylinder engine, it is necessary to measure the resistance on each injection valve. The required value is 15–20 Ohms.
9. If necessary, replace the faulty injection valve.
Checking the jet shape and tightness
The original material is available on the portal: www.vwmanual.ru
1. Disconnect the plug from the cold start valve.
2. Remove the injection valves.
3. Disconnect the supply and return lines at the fuel distributor.
4. Direct the valve outlet into suitable containers.
Caution! Protect your eyes from fuel splashes.
5. Disconnect the blue plug (arrow) from the temperature sensor on the coolant pipe.
6. Connect a 15 Ohm resistance to the temperature sensor plug contacts.
7. Connect the injection valve plug (2) to the contacts (1) of the fuel distributor using additional wires.
8. Turn on the starter for a few seconds (assistant), comparing the shapes of the jets of the injection valves with each other. The fuel jet should have a conical shape and look the same on all valves.
9. Install the valves.
Warning! Do not use household detergents. To avoid damaging the washer pump.
10. When connecting the valves, make sure that the rings are not damaged. Check the sealing ring for damage, replace if necessary. Lubricate the sealing ring with fuel before installation.
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