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2019-05-15
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Robert Bosch GmbH
TROUBLESHOOTING AND ANALYSIS | ACS 652 | 27
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11.2.3 Fault message that can occur during the vacu-
um phase
"A/C SYSTEM FULL"
¶
Check the pressure at the pressure gages M 1 and M 2.
Pressure above 0.3 bar, perform recovery.
Pressure below 0.3 bar, adjust pressure sensor P 1.
"
If the message is still displayed, replace the pressure
sensor.
"
If the message is still displayed, replace the com-
puter PCB.
11.3 Faults during refrigerant preparation
1.
Check hose connections on the internal refrigerant
cylinder.
2.
Valves V1, V2, V3 and V4 must be open.
3.
Check EV7 for leaks.
4.
Check filter F 1 for impurities and clean with com-
pressed air.
5.
Check function of valve VU2
6.
Check the expansion valve (3) for the correct pres-
sure value (2 - 2.3 bar).
7.
Check whether the internal refrigerant circuit is
soiled or clogged.
i
If the compressor does not start, make sure that a
supply voltage is connected to the compressor. If no
voltage is applied, check the supply leads and the
switching operation of the compressor relay.
11.4 Non-condensing gases are not drai-
ned
¶
Mechanically test drain valve V6.
11.5 Faults during filling with refrigerant
11.5.1 Vehicle air conditioning system cannot
be filled
1.
Check hose connections on the internal refrigerant
cylinder.
2.
Valves V1, V2, V3 and V4 must be open.
3.
Check the calibration of the scales.
i
Ensure that the refrigerant scales are not blocked.
i
You must ensure that the control PCB applies the set
weight value; if not, check whether the refrigerant
cylinder contains sufficient refrigerant for the filling
process.
i
Check whether EV6 and EV3 are supplied with
power. If so, they must be replaced. If they are not
supplied, the connecting cables and the control PCB
must be checked.
11.5.2 Other fault messages
Please see chapter 9.2
