AVL DiGas 4000 - Page 116

4-/5-Gas Measuring Instruments Unit AVL 4000
5-20 Service Manual
Primary error symptom Primary cause
(of error)
Secondary cause of
error
Possible tests/
establishing cause
Remedy
Leak in hose, pre-
filter, screwed
coupling, probe or
instrument filter
Damage
filter leaking after
being replaced
Probe kinked?
Any damage
visible?
Replace or repair
Ambient
temperature
<0…5° C
Move instrument
elsewhere
Let pump warm up
Trifilter leaking
(465)
filter housing or
condensate
collector leaking
Faulty O-rings?
Filter not properly
sealed after being
replaced
Check O-rings
Check screw-in part
on filter housing/
condensate collector
Clean or replace O-
rings
Screw in connector
fitting using sealant
Pump faulty or
heavily soiled
Pump suction poor
Pump frozen ("ice"
in pump)
Pump heavily soiled
Pump connection
fitting leaking ?
Is soiling visible
Stored at below
0° Celsius?
Gas flow too low?
Change filter
regularly, clean
pump condensate in
the instrument, do
not store at below
0° C
Leak test carried
out incorrectly
Probe hose only
bent
Viton hose becomes leaky when kinked or
bent at temperatures below 10° C
Use original silicon
cap
Check valve is
faulty
Soiling
Filter not changed
often enough
Valve frozen
Any soiling visible?
Stored at below
0° Celsius?
Replace check valve
Hose after O2
sensor is pinched
Check Lay hose so that it is
not pinched
Instrument leaking
Faulty hose or
solenoid valve in
instrument
Soiling
Filter rarely
replaced
Valve frozen
Solenoid valve or
driver faulty
Any soiling visible?
Stored at below
0° Celsius?
Air sucked in at
carbon filter during
leak test
Change filter
correctly
Replace filter after
testing 2-stroke
engine
Replace solenoid
valve or pneumatics
board (4000)