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: Checking Movement Of Wastegate Linkage

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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 Both Vacuum Lines And Special Tool (2 201 924) With T-Piece

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NOTE: Remove all special tools.
Reassemble the vehicle.