Test Steps - Section 32

Preliminary work:
Diagnosis - Diagnostic Trouble Code (DTC) Memory: PSE, Diagnostic Trouble Code (DTC) Memory - Section 12
PSE Control Module Test PSE, Pneumatic System Equipment (PSE) Control Module

Data (mbar)
Test procedure:
Allowable system leakage at 600 mbar pressure or 300 mbar vacuum in 1 minute. Permissible deviation <=30 mbar
Allowable leakage of actuators with lines at 600 mbar pressure or 300 mbar vacuum in 1 minute. Permissible deviation <=25 mbar

Special Tools:

A. Entire System:

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 RH (BA) using connector 129 805 04 44.

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

Parts Required for Test:
1 Connector 129 805 04 44
2 Connection hose, 50 mm long 007 997 61 82
1 Pneumatic line, 1 m long 000 158 14 35

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 Steps 1.0 & 2.0:

B. Individual Lines with Actuators:

Preparation For Test:
Vehicles up to 07/94:
1. Pry off orange backup assist (BA) pneumatic line at pneumatic multiple connector (using a 7 mm open end wrench).
2. Connect tester in sequence to each of the orange BA pneumatic lines using connector 007 997 61 82.

Vehicles as of 08/94:
1. Disconnect orange BA pneumatic lines at pneumatic distributor.
2. Connect tester in sequence to each of the orange BA pneumatic lines using connector 007 997 61 82.

Letters on the distributor indicate to which of the actuators the pneumatic line leads.
A -> Left actuator
B -> Right actuator

NOTE:
1. If an actuator does not operate correctly and no leakage is found, check the respective lines for kinks or blockages.
2. On vehicles as of approx. 06/94, the disconnected pneumatic lines are to be reconnected to the distributor with connector 007 997 61 82.

Parts Required for Test:
1 Connector, 50 mm long 007 997 61 82

Test Steps 3.0 & 4.0:

C. Actuators

Preparation For Test:
1. Provide access to actuator.
2. Connect vacuum/pressure tester to pneumatic connection of actuator.

Parts Required for Test:
1 Pneumatic line 129 800 62 15
1 Connector, 50 mm long 007 997 61 82

Test Steps 5.0 & 6.0:

D. Lines

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

Parts Required for Test:
1 Cap 000 987 29 45
1 Connector, 50 mm long 007 997 61 82

Test Steps 7.0 & 8.0: