Bosch EPS 708 - Page 83

1 689 975 233 2018-05-08| Robert Bosch GmbH
Trouble-shooting | EPS 708 | 83 en
Fault situation 2
The test pressure required during measurement cannot
be attained although the high-pressure pump is intact.
Cause:
The pressure control valve in the high-pressure rail is
not tight.
1
2
4
3
458797-16
a)
b)
Fig. 151: Seal of pressure control valve
a) Intact pressure control valve seal
b) Faulty pressure control valve seal
1) Pressure control valve
2) Sealing edge
3) Inlet with fine strainer
4) Return
Remedy:
1. Remove the pressure control valve
(see section 6.37).
2. Check the sealing edge of the pressure control valve
and the sealing cone in the high-pressure rail for
damage (scoring, indentation,...).
3. Replace the damaged pressure control valve or
sealing cone.
! Note the tightening torque when installing the
pressure control valve.
! Always use a new sealing cone when fitting a
pressure control valve in the high-pressure rail.
4. Screw the pressure control valve back into the high-
pressure rail and tighten.
Fault situation 3
Calibrating oil emerges from the pressure control valve
during the pump test.
Cause:
The seal in the low-pressure section is not tight.
Remedy:
1. Remove the pressure control valve
(see section 6.37).
2. Check the O-ring of the sealing ring and replace if
necessary.
! Note the tightening torque when installing the pres-
sure control valve.
! Always use a new sealing cone when fitting a pressu-
re control valve in the high-pressure rail.
3. Screw the pressure control valve back into the high-
pressure rail and tighten.