Preliminary work: PSE control module voltage supply 23 PSE 1.0, 2.0

Data (mbar)

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

Preparation for Test: Vehicles up to approx. 12/93: 1. Disconnect pneumatic multiple connector from PSE control module. 2. Connect tester to bottom side of pneumatic multiple connector at SRU (MVA) using connector 129 805 04 44. Vehicles as of approx. 01/94: 1. Disconnect transparent MVA pneumatic line with socket 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 component compartment and pry off all pneumatic lines except transparent MVA line at connection 1. Parts Required for Test: 1 Connector 129 805 04 44 1 Connector, 50 mm long 007 997 61 82 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), SRU (German) = MVA (English), OSL (German) = OSB (English).

	Test scope	Test connection	Test condition	Nominal value	Possible cause/Remedy
1.0	Multiple connector, pneumatic line with vacuum distribution block	Black connector on tester to connector SRU on bottom of pneumatic multiple connector.	Apply 300 mbar vacuum to entire system.	Vacuum loss 30 mbar in 1 minute.	33 PSE 2.0,

Preparation for Test: Vehicles up to approx. 12/93: 1. Pry off transparent 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 approx. 01/94: 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 component compartment and pry off all pneumatic lines except transparent MVA line at connection 1. Parts Required for Test: 1 Connector, 50 mm long 007 997 61 82 1 Connector 129 805 04 44

	Test scope	Test connection	Test condition	Nominal value	Possible cause/Remedy
2.0	Vacuum applied to vacuum distribution block and pneumatic line	Black connector on tester.	Apply 300 mbar vacuum to vacuum distribution block and line.	Vacuum loss 25 mbar in 1 minute.

Preparation for Test: 1. Remove vacuum distribution block. 2. Connect vacuum/pressure tester to connection 1. Parts Required for Test: 1 Connector 129 805 04 44 1 Connector, 50 mm long 007 997 61 82

	Test scope	Test connection	Test condition	Nominal value	Possible cause/Remedy
3.0	Vacuum leakage	Black connector on tester.	Apply 300 mbar vacuum to vacuum distribution block.	Vacuum loss 25 mbar in 1 minute.	Vacuum distribution block.

Preparation for Test: 1. Connect tester to one end of pneumatic line and plug other end with cap part no. 000 987 29 45. Notes: 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 scope	Test connection	Test condition	Nominal value	Possible cause/Remedy
4.0	Vacuum leakage	Black connector on tester.	Apply 300 mbar vacuum to pneumatic line	Vacuum loss 0 mbar in 1 minute.	Pneumatic line.