Checking the Hall sensor (VW Polo 3)

1. Disconnect the wiring connector from the Hall sensor.

2. Connect the multimeter using the wires from VAG 1594 to the outer contacts of the wiring connectors (Fig. 5.62).



3. Turn on the ignition. Specification value: min. 9 V.

4. Turn off the ignition.

5. Connect the VAG 1598/18 tester to the control unit connector wiring harness (fig. 5.45).

6. Check the wires between the tester and the connector for open circuit: pin 1 + socket 20, pin 2 + socket 13, pin 3 + socket 8. Wire resistance: max. 1.5 ohms.

7. Additionally check for short circuit from one wire to another. Specification resistance: ∞ Ohm.

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8. If no faults are found in the wiring and there is voltage between contacts 1 and 3, replace the Hall sensor.

9. If no faults are found and there is no voltage between contacts 1 and 3, replace the engine control unit.