Test Steps - Section 12

Preliminary work: Pneumatic System Equipment (PSE) Control Module
Diagnosis Diagnostic Trouble Code (DTC) Memory: PSE
PSE control module voltage supply: PSE ETP test step 1.0
PSE Control Module Test: PSE

Data (mbar)
Test procedure
Allowable leakage of pneumatic multiple connector, pneumatic lines
and vacuum distribution block at
300 mbar vacuum in 1 minute. Permissible deviation <=30 mbar
Allowable leakage of vacuum distribution block with line at
300 mbar vacuum in 1 minute. Permissible deviation <=25 mbar

Special Tools:

A. Pneumatic multiple connector, pneumatic line with vacuum distribution block

Preparation For Test:
Vehicles up to 07/94:
1. Disconnect pneumatic multiple connector from PSE control module.
2. Connect tester to bottom side of pneumatic multiple connector at PU using connector 129 805 04 44.

Vehicles as of 08/94:
1. Disconnect transparent MVA pneumatic line with socket from PSE control module.
2. Connect tester to disconnected pneumatic line using connector 129 805 0444.

All vehicles:
1. Provide access to vacuum distribution block in right footwell and pry off all pneumatic lines, except transparent MVA line at connection 6.
2. Plug connections 5 and 13.

Parts Required for Test:
1 Connector 129 805 04 44
2 Connector 129 800 95 15
2 Cap 000 987 29 45


NOTE: The connections on the PSE control module and pneumatic multiple connector are marked with their German acronyms. In other words:
ZV (German) = CL (English),
RH (German) = BA (English),
FKS (German) = RHR (English),
SFG (German) = RTG (English),
PU/P+ (OSL) (German) = PU/P+ (OSB) (English),
PU/P- (SRU) (German) = PU/P- (MVA) (English).

Test Step 1.0:

B. Line with vacuum distribution block

Preparation For Test:

Vehicles up to 07/94:
1. Pry off transparent manifold vacuum assist (MVA) pneumatic line at pneumatic multiple connector (using a 7 mm open end wrench).
2. Connect tester to transparent MVA pneumatic line using connector 007 997 61 82.

Vehicles as of 08/94:
1. Disconnect transparent MVA pneumatic line from PSE control module.
2. Connect tester to disconnected pneumatic line using connector 129 805 04 44.

All vehicles:
1. Provide access to vacuum distribution block in right footwell and pry off all pneumatic lines except transparent MVA line at connection 6.
2. Plug connections 5 and 13.

Parts Required for Test:
1 Connector, 50 mm long 007 997 61 82
1 Connector 129 805 04 44

Test Step 2.0:

C. Vacuum distribution block

Preparation For Test:
1. Remove vacuum distribution block.
2. Connect vacuum/pressure tester to connection 6, color code white.
3. Plug connections 5 and 13.

Parts Required for Test:
1 Pneumatic line 129 800 09 15
1 Connector, 50 mm long 007 997 61 82
2 Connector 129 800 95 15
2 Cap 000 987 29 45

Test Step 3.0:

D. Line

Preparation For Test:
1. Connect tester to one end of pneumatic line and plug other end with cap 000 987 29 45.

NOTE: If vacuum is not available at the vacuum distribution block with the PSE control module operating correctly check the effected line for clogging or kinks.


Parts Required for Test:
1 Cap 000 987 29 45
1 Connector 50 mm long 007 997 61 82
1 Connector 129 805 04 44

Test Step 4.0: