Checking the crankshaft speed sensor (VW Polo 3)

1. Turn off the ignition.

2. Disconnect the wiring connector from the crankshaft speed sensor (Fig. 7.49).



3. Measure the resistance between contacts 1 and 2 of the connector (Fig. 7.50). Specification value: 1.0-1.5 kOhm.



4. If the specified value is not achieved, replace the sensor.

5. If the specified value is reached:

• connect the VAG 1598/22 tester to the engine control unit wiring harness (fig. 7.38);
• check the wire between the tester and the connector for open circuit: contact 1 and socket 69, contact 2 and socket 67, contact 3 and socket 71 (Fig. 7.51) Specified value: 1.5 Ohm;
• additionally check the wires for open circuit. Specification resistance: ∞ Ohm.

6. If no fault is found in the wires, replace the engine control unit.

(The original article is posted on the website: «www.VWmanual.ru»)