Trouble-Shooting; Trouble-Shooting Table - Bosch EPS 708 Repair Instructions

9.

Trouble-shooting

9.1

Trouble-shooting table

Effect Cause
No display on operator Monitor and/or PC not connected
unit or switched on.
PC-monitor connecting cable faul-
ty or not connected
Faulty PC/monitor
Calibrating oil too hot Electric fuel pump EKP3/M8 faul-
ty
Chiller pump does not start
Too little cooling water in chiller
Faulty chiller
Fault in water inlet
No or too low calibrating Electric fuel pump EKP1/M6 or
oil delivery EKP2/M7 faulty
Continuous delivery of ca- Electric fuel pump EKP1/M6 or
librating oil EKP2/M7 has a short-circuit to
ground
Electric fuel pump EKP1/M6 or
EKP2/M7 faulty
Test does not start Normal state not active
Protective hood not open yet
Faulty motor
No or too low quantities Plug not inserted or not inserted
are displayed correctly on DRV of high-pressu-
re rail.
Incorrect current calibration va-
lues
Quantity displayed is too Incorrect current calibration va-
large lues
Protective hood lowers Faulty pneumatic spring
by itself
Hoses become detached Clogged pressure control valves
from the control valve
block inlet
Return quantity too low Clogged pressure control valves
Robert Bosch GmbH
Trouble-shooting | EPS 708 | 81
Remedy
Check that both devices are con-
nected and switched on.
Connect/replace
Replace
Replace electric fuel pump EKP3/
M8 (see section 6.15)
Reset chiller. To do so, simultane-
ously press the two "Clear" but-
tons on the chiller control panel
for approx. 5 s.
Remove, open and clean pump.
Bleed and fill chiller
Replace chiller (see section 6.7)
Check water inlet
Replace electric fuel pump EKP1/
M6 or EKP2/M7
(see section 6.15)
Check whether electric fuel pump
EKP1/M6 or EKP2/M7 has a
short-circuit to ground.
Replace electric fuel pump EKP1/
M6 or EKP2/M7
(see section 6.15)
Go through checklist for normal
operation (see section 5)
Open and close protective
hood 1x
Replace motor (see section 6.21) A second person is required for
Check plug connections on all
three DRVs of the high-pressure
rail and insert correctly.
Check calibration values for PCB
A3 (see section 6.1.3)
Check calibration values for PCB
A3 (see section 6.1.3)
Replace pneumatic spring
(see section 6.18)
Clean pressure control valves in
an ultrasonic bath, or replace.
See section 6.37 for removal and
installation.
Clean pressure control valves in
an ultrasonic bath, or replace.
See section 6.37 for removal and
installation.
Special notes
Error: ID3 tP "Pump heat protec-
tion alarm"
A second person or suitable lif-
ting gear is required
Only applies to test benches wit-
hout chiller
assistance
A second person and a support is
required
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1 689 975 233 2018-05-08
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