Checking the injectors (VW Passat B4)

Check the supply voltage of the injectors. To do this: disconnect the fuel line connector: connect the LED tester to the terminals of the line connector: turn on the starter. The LED tester should blink.

If the tester LED does not blink, perform the following operations: connect the fuel line connector; check the wires going to the injectors and their connections. Eliminate any detected faults. If the integrity of the injector circuit is not damaged, replace the controller. Disconnect the fuel line connector. Connect an ohmmeter to the terminals of the connector and check the total resistance of the injector winding, which should be within 3.7-5.0 Ohm (fig. 2-115). If it is more, remove the protective cover of the injector wiring and, by disconnecting the connectors of the pads one by one, check the resistance of each injector, which should be 15-20 Ohm. Replace the faulty injector.