Preliminary work: Diagnosis - Diagnostic Trouble Code (DTC) Memory 11 PSE PSE control module voltage supply 23 PSE 1.0 PSE Control Module Test 32 PSE

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 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 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 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), PÜ/P+ (OSL) (German) = PÜ/P+ (OSB) (English), PU/P- (SRU) (German) = PU/P- (MVA) (English).

	Test scope	Test connection	Test condition	Nominal value	Possible cause/Remedy
1.0	Pneumatic multiple connector, pneumatic line with vacuum distribution block	Black connector on tester.	Apply 300 mbar vacuum to entire system.	Vacuum loss 30 mbar in 1 minute.	33 PSE 1.0, 12 2.0.

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 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.	12 3.0, 12 4.0.

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 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 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 scope	Test connection	Test condition	Nominal value	Possible cause/Remedy
4.0	Line holds vacuum	Black connector on tester.	Apply 300 mbar vacuum to pneumatic line.	Vacuum loss 0 mbar in 1 minute.	Pneumatic line.