AVL AVL DiCom 4000, Service Manual

Page: 113 / 182

4000 4-/5-Gas Measuring Instruments Unit
Service Manual 5-17
Primary error symptom Primary cause
(of error)
Secondary cause of
error Possible tests/
establishing cause Remedy
Measurement cell
contaminated with
condensate Condensate end of
pump faulty
Condensate
discharge hose
clamped closed Water, condensate
escaping at oxygen
sensor Clean or replace
measurement cell
Replace measuring
instruments unit
Error in measuring
instruments unit Hardware fault or
software error
Incorrect control
parameters
Faulty EPROMs or
processor Check error status
ES and zero status
ZS, ES=000000 = ok
ZS=01, 05, 0F or 1E
after zeroing = ok Try reset
Try reset or replace
measuring
instruments unit
Pump cable faulty
(465) Interference, self-test Permanently zero Use edge protectors
(465)
Ambient
temperature too
cold (less than
5° C) Instrument stabilises
itself every 15 min Is the instrument set
up out-of-doors? Place instrument
somewhere else
Ambient temperature fluctuates
significantly (more than 15° C) Instrument set up
near garage doors? Place instrument
somewhere else
Low flow occurred Probe hose kinked;
did someone tread
on hose?
Zeroing occurs after
"Low Flow" error Lay the hose without
kinks
Replace filter
Clean metal filter
(465)
Error occurred
during zeroing Hose kinked/
blocked
O
2
signal incorrect,
Pressure value
incorrect
Service mode:
raw values O
2
:
210 to 240?
Pressure correct?
approx. 760 torr at
sea level
Check hoses
Check flow rate (at
least 4
min
l
total)
Try reset or replace
faulty part
Replace O
2
sensor
Check hoses
Fluctuating
measurement
values Measuring
instruments unit
detector faulty Service mode:
fluctuating CO,
CO
2
, HC values?
FE not 128 ± 10
Try reset or replace
measuring
instruments unit, see
also “Fluctuating
measurement values”
Fluctuating
measurement
values Exhaust gas or
petrol in the air? Can you smell
anything? Air the room, replace
carbon filter if
necessary
Permanently
stabilising
Faulty capacitor
(465) Smell of burning? Replace board