Slow Charge; Will Not Hose Flush; Will Not Print (Only For Variants With Printer) - Bosch ACS 553 Service Manual

Diagnostics and Testing

Slow Charge

When the charge has slowed, the unit will enter
the power charge process to build tank pressure
and temperature. It will attempt to power charge
three times before displaying:
Charge Stalled.
Retry, ESC, or select Charge icon to use
vehicle A/C system to complete charge.
1. Check and ensure there is a good vacuum
in the vehicle being tested.
2. Verify sufficient pressure in the ISV to
transfer refrigerant.
NOTE: During the charge process, there
must be a transfer of at least 23 g (0.05 lb)
of refrigerant within 30 seconds. If not, the
compressor is switched on and off to build tank
pressure. This process may be repeated twice.
3. Ensure chargeable weight is greater than
desired charge.
4. Verify the charge couplers are completely
open and the vehicle ports are actuated.
5. Check for debris in any of the charging circuit
solenoids. Clean or replace if necessary.
6. If slow charge persists, there may be a pin
hole leak in the ISV dip tube. Substitute a
known good ISV tank.

Will Not Hose Flush

Flushing the hoses is required if the next vehicle
to be serviced contains a different type of A/C
system oil than the previous vehicle serviced.
1. Verify the service hoses are properly
attached to the unit storage ports without
any restrictions and coupler valves are
open.
2. Check Tank Liquid solenoid (S7) for debris
and tank hoses are properly connected to
the ISV.
3. If there is no pressure on the gauges, refer
to the Will Not Charge troubleshooting
procedures earlier in this section.
4. If the pressure does not clear on the gauges,
refer to the Will Not Recover troubleshooting
procedures earlier in this section.
1 689 975 295 2021-04-13
ACS 553, ACS 563 Service Manual
Will Not Print (only for variants with
printer)
1. Does the printer have power?
2. Does the printer have paper? Verify the paper
is installed correctly in the printer. The paper
should be rolling off the back of the roll.
3. If the machine is operating in direct sunlight,
move it or cover the face of the printer and
try again.
Printer Has Power
If the printer has power, check the continuity of
the printer harness between the printer and the
control board (P15).
• If harness tests good, replace the printer
assembly and retest. If the harness test
fails, replace printer harness.
• Check the output of the power supply at
PSJ2. If there is 12 VDC at PSJ2, check
the power input to the control board at
CBP19.
• If printer still does not print, replace the
control board.
Printer Does Not Have Power
Verify the printer is receiving power at harness
connector. Test for +5 VDC across the RED
(pin 1) or YELLOW (pin 2), and BLACK (pins
3 & 4) wires.
• If voltage is present, replace the printer
assembly and retest. If not, check for
printer power at CBP15.
• The control board receives power from
the power board PBP2, through connector
P19. If the control board is not receiving
power, the printer will not function.
• If printer power is present at CBP15, check
for continuity of the printer harness. Repair
or replace if necessary. If printer power is not
present at CBP15, replace the control board.
Replace the Printer Paper
1. Pull the cover open by inserting a finger into
the pocket in the cover and pull.
2. Remove the paper core.
3. Install the new roll of paper with the end
of the paper at the top of the roll, unrolling
from the back.
4. Feed the paper out the top of the opening,
and close cover.
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Robert Bosch GmbH