Checking the crankshaft speed sensor (VW Polo 3)

1. Turn off the ignition.

2. Disconnect the wiring connector from the crankshaft speed sensor.

3. Measure the resistance between contacts 1 and 2 of the connector (Fig. 6.76). 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:

On vehicles with a 68-pin control unit wiring connector

• Connect the VAG 1598/18 tester to the engine control unit wiring harness (fig. 6.54);
• Check the wire between the tester and the connector for open circuit: contact 1 and socket 33, contact 2 and socket 8, contact 3 and socket 1 (Fig. 6.77). Specified value: 1.5 Ohm;
• Additionally, check the wires for open circuit. Specification resistance: ∞ Ohm.

On vehicles with 80-pin control unit wiring connector

• Connect the VAG 1598/22 tester to the engine control unit wiring harness (fig. 6.56);
• 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. 6.77). Specified value: 1.5 Ohm;
• Additionally, check the wires for open circuit. Specification resistance: ∞ Ohm.

For all cars

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