Checking the injectors (Mercedes-Benz E-Class W123)

1. The serviceability of the injectors is best checked using the Bosch 6E84.100.202 control device in positions 6-10 of the program switch. If you do not have one, the serviceability of the injectors can be checked as follows:

2. Disconnect the pads from the injectors.

3. Turn on the ignition.

4. Check the voltage on both contacts of the connector with a voltmeter. The wiring and the electronic control unit are in good condition if the voltmeter shows the same voltage on both contacts.

Attention! The injectors are designed for a voltage of 3 V.

5. Attach the pads to the injectors.

6. Plug the fuel supply line to the starting injector.

7. Remove the injectors.

8. Disconnect the wire from the ignition distributor.

9. Turn on the starter. The injectors should inject fuel at equal intervals.