40 8.3.1 Diagnosis Preparation; 40 8.3.2 Perform Diagnosis - Bosch ACS 810 Manual Original

en | 50 | ACS 810 | Testing the vehicle air conditioning system
8.3 Diagnosis
!
The ACS 810 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.
8.3.1 Diagnosis preparation
!
Park the vehicle in a place where it is protected
from wind and sunlight. Even slight air movement
can falsify the values.
!
Follow the additional ACS 810 menu prompting.
1. Connect the service hoses to the vehicle.
2. Lower the hood without closing it.
3. Start the engine on the vehicle to be tested.
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The engine should have operating temperature.
4. Increase vehicle speed to 1,500 – 2,000 rpm and
hold.
5. Switch on the 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.
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Wait (3 – 5 minutes) until the vehicle air
conditioning system cools evenly.
!
Measure the ambient temperature properly. Stay at
a distance of approx. 1 m from the vehicle.
!
Measuring in close vicinity of the engine can lead
to a false diagnosis.
11. Measure and record the ambient temperature.
12. High-pressure gage: Read and record the highest
pressure value when the compressor is switched
on.
13. Low-pressure gage: Read and record the lowest
pressure value when the compressor is switched
on.
14. Temperature: Measure and record the mean air
temperature value (at middle fan openings).
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8.3.2 Perform diagnosis
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The diagnosis function works only if a vehicle is
selected in the database and when two service
hoses are connected.
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If no vehicle is selected, ACS 810 opens the
database and prompts to select a vehicle in order
to perform a diagnosis.
!
Follow the additional ACS 810 menu prompting.
1. Call up the start screen.
2. Press <MENU>.
3. Select "DIAGNOSTIC" with o u and confirm with
E.
 Message is displayed.
4. Select the number of service hoses.
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Only 2 service hoses can be entered for diagnosis.
5. Select vehicle from the vehicle database.
6. Apply data.
7. Enter the measured ambient temperature and
confirm with E.
8. Enter the read pressure value (HP) and confirm
with E.
9. Enter the read pressure value (LP) and confirm
with E.
10. Enter the air temperature measured at the fan
openings and confirm with E.
 Option <1> and <2> are displayed:
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<1> Result:
The entered data is displayed along with the status.
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<2> Diagnosis:
A list of potential causes is displayed along with
the potential solutions.
11. Select option <1> or <2>.
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Confirm with E
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Return with <Stop>.
Robert Bosch GmbH