9. Diagnosis
9.1 Preparatory work
The diagnosis function works only if a vehicle is
selected in the database.
If no vehicle is selected ACS 611 opens the database
and prompts to select a vehicle in order to perform
adiagnosis.
! Park the vehicle in a place where it is protected from
wind and sunlight. Even slight air movement can
falsify the values.
! Observe the ACS 611 menu prompting.
1. Connect the service hoses to the vehicle.
2. Lower the hood without locking it.
3. Start engine (vehicle).
i The engine should have operating temperature.
4. Increase speed of vehicle to 1500 – 2000 rpm and
hold.
5. Switch on the vehicle air-conditioning system.
6. Open the fan openings (middle of vehicle).
7. Set vehicle air-conditioning system to maximum
cooling capacity.
8. Set fan to maximum ventilation.
9. Switch off air circulation.
10. Open doors and windows.
! Check if the compressor switches on.
i Wait (3–5minutes) until the vehicle air-conditioning
system cools evenly.
! Measure the ambient temperature properly.
Measurements must be taken at a distance of
approx.1m from the vehicle.
! Measuring in close vicinity of the engine can lead to
a false diagnosis.
11. High-pressure gauge: Read highest pressure value
when compressor is switched on.
12. Low-pressure gauge: Read lowest pressure value
when compressor is switched on.
13. Temperature: Read mean air temperature value
(atfan openings in the middle).
! The ACS 611 diagnostic software was developed
to provide support and instruction for defects in
vehicle air-conditioning systems. The diagnosis and
recommendations serve only as a reference and do
not constitute recommended repair instructions.
9.2 Diagnosis
!
Observe the ACS 611 menu prompting.
1. Call up start screen.
2. Press <MENU>.
3. Select "DIAGNOSTIC" with o u and confirm with E.
4. Enter measured ambient temperature and confirm
with E.
5. Enter the read pressure value (HP) and confirm
withE.
6. Enter the read pressure value (LP) and confirm
withE.
7. Enter air temperature measured at the fan openings
and confirm with E.
Option <1> and <2> are displayed:
8. <1> Select result, display the entered data and the
status, and print with E.
9. Call up diagnosis; display list of possible error
causes and troubleshooting procedure with <2> and
print with E.
i Return with <Stop>.
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