Diagnostic Manual, Climate Control, Volume 1
Pneumatic Test Program - Test
 |
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
Vacuum actuators
Left/right defroster flap vacuum actuators (37, 38), diverter flap left center air outlet vacuum actuator (41) and left/right footwell flap vacuum actuators (47, 48).
Review  32 as well. |
 |
Evacuate system with
400 mbar vacuum.
Left display code  :
Vacuum actuators 37, 38, 47 and 48 and vacuum lines (vacuum line colors medium green and red) with vacuum applied.
Left display code  and  :
Vacuum actuator 41 and vacuum line (vacuum line color dark green) with vacuum applied.
See Vacuum diagram 1,
33 /4 |
 30 mbar
pressure
increase in
1 minute.
30 mbar
pressure
increase in
1 minute. |
Remove vacuum lines from Y11 and test each vacuum actuator with its vacuum line.
Replace leaking actuators and or leaking vacuum lines. |
| 2.0 |
Vacuum actuators
Blend air flap, left/right center air outlet vacuum actuators (45, 46) and left/right defroster flap vacuum actuators (37, 38).
Review 32 as well. |
|
Evacuate system with
400 mbar vacuum.
Left display code :
Left display code  and  : Vacuum actuators 45, 46, 37, 38 (vacuum line color red) with vacuum.
For vacuum actuators 45, 46: see Vacuum diagram 2, 33 /5
For vacuum actuators 37, 38: see Vacuum diagram 1, 33 /4
|
30 mbar
pressure
increase in
1 minute. |
Replace leaking actuators and or leaking vacuum lines. |
| 3.0 |
Vacuum actuators
Main air flap front vacuum actuator (44), air recirculation flap vacuum actuator (49) and blend air left/right center air outlet vacuum actuators (45, 46).
Review 32 as well. |
|
Evacuate system with
400 mbar vacuum.
Left display code :
Left display code and : Vacuum actuators 44, 49, 45, 46 and vacuum lines (vacuum line color red) with vacuum.
For vacuum actuators 44, 49: see Vacuum diagram 3, 33 /6
For vacuum actuators 45, 46: see Vacuum diagram 2, 33 /5
|
30 mbar
pressure
increase in
1 minute.
|
Replace leaking actuators and or leaking vacuum lines. |
Vacuum diagram 1
The following prefixes may appear with line colors:
d = dark
m = medium
l = light |
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Vacuum diagram 2
The following prefixes may appear with line colors:
d = dark
m = medium
l = light |
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Vacuum diagram 3
The following prefixes may appear with line colors:
d = dark
m = medium
l = light |
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Printable version
