Checking the supply voltage
1. Attach the wiring connector to the oxygen sensor 1 (pic. 3.41).
2. Connect the multimeter using an adapter from the VAG 1594 tester to pins 1 and 2.
3. Start the engine and check the voltage. It must be at least 11 V.
4. Turn off the ignition. If there is no voltage, connect the VAG 1598/18 tester to the wiring harness of the engine control unit (rice. 3.34).
5. Turn on the ignition.
6. Shunt sockets 1 and 25 using auxiliary wires from VAG 1594.
7. The fuel pump should work.
8. Check the multimeter reading. Specification voltage: 11V.
9. If the required value is not reached, check the wire connection to the relay box in accordance with the wiring diagram.
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