MAHLE ACX150, Service Manual

Page: 40 / 202

EN | 39 | ACX150/250 | Diagnostic
© MAHLE
ATTACHMENT 5 – TROUBLE SHOOTING
MALFUNCTION POSSIBLE CAUSE POSSIBLE SOLUTION
1. If the “SD card not
present” message is
shown during switch
on and/or during
software update. SD card absent or not
mounted well. 1. Insert or check SD card
insertion.
2. Reprogram the recharge station.
2. During the
recovery phase there
is an evident
refrigerant leak from
the exhausted oil
container.
The leak test is
negative.
Dirt inside the Oil
discharge solenoid valve. 1. Cleaning of the solenoid valve
OUT – S.
2. Check of the gasket efficiency.
3. calibrate pressure sensor
3. During the
automatic cycle it is
not possible to inject
and recover the oil. Oil loading cell out of
calibration or defective. 1. Calibration of the exhausted
and new oil scales.
2. Replace if needed.
4. Vacuum pump
emits disturbing
vibrations Defective vacuum pump Vacuum pump replacement
5. After the vacuum
phase the leak test
has a negative result. This may occur when the
vacuum time is too short,
4-5 minutes.
When a vacuum time less than 20
minutes is set, the following
message appears:
“Less than 20 minutes of vacuum
do not guarantee the execution of
a correct procedure. Continue?”.
The solution is keeping to the 20
minutes vacuum time.
6. The gas scale
appears blocked on
a certain value. Loading cell locking
screw not sufficiently
unscrewed.
Further unscrew the locking screw
of the cell, ensuring that it is not in
contact with the cell during use.