Solenoid Valve Inspection - Valeo Thermo E+ 120 Workshop Manual

Thermo E+ 120/200/320
Inspection using the DTT diagnosis
• Remove burner (see 8.2).
• Connect the DTT diagnosis to the heater using the
adapter wiring harness (ref. to Operating Instructions
for the DTT diagnosis).
• Connect a temperature sensor for the duration of
the test only to the control device.
Warning!
Inadvertent operation of the removed burner can
cause severe burn injuries.
• Reconnect the heater with the vehicle electrical
system.
• Start DTT diagnosis, establish connection to the
heater and open the Component Test menu.
• In the Component Test menu, select the fuel pump
pressure test and start it.
• Proceed according to the DTT diagnosis instructions.
If the specified pressure (see
reached, it can be readjusted. For that rotate the
adjusting screw (see Fig.507) max. one revolution.
If the prescribed pressure despite readjustement not
be achieved or occur leaks, the fuel pump must be re-
placed.
• After test completion proceed according to the DTT
diagnosis instructions and terminate DTT diagnosis
as required.
• Disconnect the heater from the vehicle electrical
system (Observe 5.2
• Unplug external temperature sensor from control
device.
• Remove the DTT diagnosis adapter wiring harness as
required.
• Reinstall burner (see 8.2).
Table 504 Fuel pump pressure
Heater version
Thermo E+ 120
Thermo E+ 200
Thermo E+ 320
Danger of severe burn
injuries!
Table 504) cannot be
!).
Operating voltage
24V 12V
9 +0.5 bar 9 +0.5 bar
9 +0.5 bar 9 +0.5 bar
9 +0.5 bar 9 +0.5 bar

5.6.10 Solenoid valve inspection

Caution!
The coil of the solenoid valve can heat up in switched-
on condition..
The solenoid valve must only be completely replaced.In
case of replacement or assembly a new gasket ring must
be used.
NOTE:
Due to system characteristics draining the space between
solenoid valve and nozzle bore may cause fuel dripping
from the atomizer nozzle for a short period of time.
A leaking valve seat of the solenoid valve can be indicated
by smoke development in the heater during the purge
cycle. Fuel drips from the atomizer nozzle. A not closing
solenoid valve can lead to a heater shut-down during
purge cycle and a heater lock-out.
Fig.509 Solenoid valve
It is possible to manually test the electrical functionality of
the solenoid valve, and using the Component Test menu
of the DTT diagnosis.
Inspection using the DTT diagnosis
• Remove burner (see 8.2).
• Connect the DTT diagnosis to the heater using the
adapter wiring harness (ref. to Operating Instructions
for the DTT diagnosis).
5 Troubleshooting
Risk of burns!
O-ring
517