11 66 521 Checking function of vacuum system (N18)

Special tools required:

2 201 924

IMPORTANT: Note the sequence of the diagnosis instructions in the ISID:
Depending on the fault pattern, the order of operations in the repair instructions may be different from the order of operations in the ISID.

Carry out procedure to check the vacuum system.

Check suction effect of vacuum pump.

Pull vacuum line (1) off vacuum pump (2).

Follow diagnosis instruction.

Fig 1: Identifying Vacuum Line And Vacuum Pump

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Connect special tool 2 201 924 to vacuum pump (1).

Fig 2: Connecting Special Tool (2 201 924) To Vacuum Pump

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Check suction effect of vacuum pump.

Follow diagnosis instruction.

NOTE: When the IMIB is used the absolute pressure is displayed.

Fig 3: Checking Vacuum Pump Suction Effect

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Check vacuum reservoir.

Detach pressure converter from bracket.

Pull off vacuum line (2) from pressure converter.

Follow diagnosis instruction.

Fig 4: Identifying Pressure Converter Vacuum Line

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Connect vacuum line (1) with special tool 2 201 924.

Follow diagnosis instruction.

Fig 5: Connecting Vacuum Line With Special Tool (2 201 924)

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Check function of wastegate valve.

Observe movement of wastegate linkage (1).

Follow diagnosis instruction.

Fig 6: Adjusting Wastegate Linkage Movement

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Leakage test of hoses to wastegate valve.

Pull vacuum line (1) off pressure converter plug connection (OUT).

Pull off vacuum line (2) from pressure converter plug connection (VAC).

Connect both vacuum lines and special tool 2 201 924 with a T-piece.

Follow diagnosis instruction.

Fig 7: Connecting Vacuum Lines And Special Tool (2 201 924) With T-Piece

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NOTE: Remove all special tools.
Reassemble the vehicle.