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ACS 553, ACS 563 Service Manual
Vacuum Pump Troubleshooting
1. Check gauges for vacuum.
2. If pressure is over 0.7 bar (10 psi), recover
hoses.
3. If unit won't maintain vacuum, check tank
liquid solenoid (S7), hoses, couplers,
gauges, and other related components, for
leakage.
4. If there is no pressure on the gauges and
the display says Pressure Exists, enter
the Service Menu and verify low-side inlet
transducer reading. If it is reading pressure
where none exists, replace transducer.
If replacing the transducer doesn't correct
the reading, replace the control board.
5. If the Vacuum Pump is not running or
appears to be running poorly, refer to
Vacuum Pump Does Not Run.
Figure 2-2. Vacuum Pump Assembly
Robert Bosch GmbH
Diagnostics and Testing
Vacuum Pump Does Not Run
1. Check for proper power source and electrical
connectors for damage or corrosion.
Replace or repair as required.
2. Clear service hoses.
3. Disconnect unit from the power source.
4. Remove the front plastic cover.
5. Connect the unit power cable directly to
the power source. Do not use an extension
cord.
6. Check for 230 V at the vacuum pump
connector, pins 2 and 3.
• If voltage is present, replace vacuum
pump assembly.
• If voltage is not present, continue to next
step.
NOTE: When checking voltage to the vacuum
pump it is normal to read low voltage at the
connector when it's disconnected and the
power to the vacuum pump is off.
7. Check for 230 V from the power board on
connector P6 pins 3 and 4.
• If voltage is present, check wiring between
the power board and the vacuum pump.
Repair as needed.
8. Perform functional check.
9. Reinstall the front plastic cover.
49
1 689 975 295
2021-04-13
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Troubleshooting
