11 66 521 Checking function of vacuum system (S63)

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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.

Necessary preliminary tasks:

Remove ENGINE COVER .
Remove FAN COWL WITH ELECTRIC FAN .

Vacuum pump is fitted on cylinder head cover 1 to 4 at rear on intake camshaft.

Check suction effect of vacuum pump.

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

Fit special tool2 201 924.

Follow diagnosis instruction.

Fig 1: Checking Suction Effect Of Vacuum Pump

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Check vacuum generation in system.

Disconnect vacuum line (1) to exhaust flap on left spring strut dome.

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

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

Follow diagnosis instruction.

Fig 2: Checking Vacuum Generation In System

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Functional check of exhaust flaps.

Check function of exhaust flap (1) on both rear silencers (2).

Follow diagnosis instruction.

Fig 3: Checking Function Of Exhaust Flaps

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Leakage test of hoses to exhaust flaps.

Check leakage test of hoses to exhaust flaps.

Disconnect vacuum line (1) with pliers (2) as shown in the graphic.

Follow diagnosis instruction.

Fig 4: Disconnecting Vacuum Line Using Pliers

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Check leakage test of hoses at vacuum reservoir.

Disconnect vacuum line (1) at vacuum reservoir (2).

Follow diagnosis instruction.

Fig 5: Identifying Vacuum Line At Reservoir

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Check wastegate capsule and linkage.

Check wastegate linkage (1) on exhaust turbochargers for freedom of movement.

Follow diagnosis instruction.

Fig 6: Checking Wastegate Capsule And Linkage

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Vacuum line (1) to vacuum reservoir.

Disconnect vacuum line (1) at T-piece and at connection to vacuum reservoir.

Follow diagnosis instruction.

Fig 7: Identifying Vacuum Line

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Release vacuum line (1) at vacuum reservoir (2).

Fig 8: Identifying Vacuum Line At Reservoir

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Vacuum line (1) to vacuum pump.

Seal vacuum line (1) at T-piece with a sealing cap (2).

Connect special tool 2 201 924 to T-piece.

Follow diagnosis instruction.

Fig 9: Sealing Vacuum Line At T-Piece With Sealing Cap And Connecting Special Tool (2 201 924) To T-Piece

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Vacuum line (1) to vacuum reservoir and pressure converter.

Disconnect vacuum line (1) on T-piece and connect to special tool 2 201 924.

Follow diagnosis instruction.

Fig 10: Connecting Vacuum Line To Special Tool

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Pressure converter connections

Disconnect vacuum hose at connection (VAC = vacuum reservoir).

Disconnect vacuum hose at connection (OUT= turbocharger vacuum unit).

Installation note:

Pressure converter cylinder 1-4 (OUT) has a fabric hose.

Pressure converter cylinder 5-8 (OUT) has a molded hose.

Fig 11: Identifying Vacuum Hose Connections

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Check function of wastegate capsule.

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

Connect vacuum line (1) with vacuum line (2) from vacuum reservoir with a T-piece and special tool 2 201 924.

Follow diagnosis instruction.

Fig 12: Checking Function Of Wastegate Capsule

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NOTE: Remove all special tools.
Reassemble the vehicle.