If the sensor fails while the engine is running, the engine may stop.
1. Disconnect the 3-pin wiring connector from the crankshaft speed sensor (arrow) (on the thermostat housing) (pic. 4.38).
2. Connect a multimeter to measure voltage using wires from the VAG 1594 tester to pins 1 (positive pole) and 3 («weight») crankshaft speed sensor wiring connector (pic. 4.39).
3. Turn on the ignition. Specification value: 4.5 V.
4. Turn off the ignition.
5. If there is no voltage, remove the cover on the left in the engine compartment and connect the VAG 1598/31 tester to the engine control unit wiring harness (on the left side of the engine compartment) (rice. 4.32). The control unit must remain disconnected.
6. Check the wire between the tester and the connector for an open circuit: pin 1 and socket 87, pin 2 and socket 82, pin 3 and socket 108 (pic. 4.39). Set value: max. 1.5 ohm.
7. Additionally, check the shorting of the wires one to the other. Set value: ∞ Ohm.
8. If no fault is found in the wires and the voltage between pins 1 and 3 is normal, then replace the crankshaft speed sensor.
9. If no fault is found in the wires and there is no voltage between pins 1 and 3, then replace the engine control unit.
Visitor comments