Checking the crankshaft speed sensor

1. Turn off the ignition.

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

3. Measure the resistance between pins 1 and 2 of the connector (pic. 6.76). Specification value: 1.0-1.5 kOhm.



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

5. If the set 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 (rice. 6.54);
• Check the wire between the tester and the connector for an open circuit: pin 1 and slot 33, pin 2 and slot 8, pin 3 and slot 1 (pic. 6.77). Set value: 1.5 ohm;
• Additionally, check the wires for an 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 (rice. 6.56);
• Check the wire between the tester and the connector for an open circuit: pin 1 and slot 69, pin 2 and slot 67, pin 3 and slot 71 (pic. 6.77). Set value: 1.5 ohm;
• Additionally, check the wires for an open circuit. Specification resistance: ∞ Ohm.

For all vehicles

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