Examination
Turn on the ignition. A valve click should be heard.
Otherwise, unscrew the electrical wire. Apply voltage to the valve from the battery through the auxiliary wire.
Model 524td: If the solenoid valve is activated, check the wiring according to the wiring diagram, as well as the power supply to the DDE control unit and main relay 1 (red). Additional details shown:
- 2 - fuel filter heating relay (orange),
- 3 - fuel pump relay (brown)
Model 525td/tds: If the solenoid valve is activated, check the wiring according to the wiring diagram, as well as the supply of the main relay DDE 1 (white) and fuel pump relay 2 (orange, in relay box).
If the valve does not operate, replace the solenoid valve.
Withdrawal
Unscrew the electrical wire.
Unscrew the stop solenoid valve with a 24 mm wrench.
Attention: Do not allow the core and spring to fall out. In the de-energized state, the valve core is extended under the action of the built-in spring.
Installation
Insert the stop solenoid valve with a new O-ring and tighten to 20 + 5 Nm.