Checking the nozzle needle displacement sensor

1. Turn off the ignition.

2. Disconnect the wiring connector from the injector needle movement sensor (arrow) (pic. 7.59).



3. Measure the resistance between the pins of the connector (pic. 7.60). Set value: 80-120 ohm.



4. If the specified value is not reached, replace the nozzle of the third cylinder with the nozzle movement sensor.

5. If the set value is reached:

• connect the VAG 1598/22 tester to the wiring harness of the engine control unit (rice. 7.38);
• check the wire between the tester and the connector for an open circuit: pin 1 and socket 62, pin 2 and socket 55 (pic. 7.61). Set value: 1.5 ohm;
• additionally check the wires for shorting one to the other, to «mass» vehicle and to the positive pole of the battery. Specification resistance: ∞ Ohm.

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