Abs Control Module -J104- And Abs Hydraulic Unit -N55-, Removing And Installing, With 4-Cylinder Diesel Engine And Abs Mark 70 Abs/ASR: Removing

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Component Location:

The ABS Control Module -J104- is attached to the ABS Hydraulic Unit -N55- and is located inside the engine compartment on the right side.

ABS Hydraulic Unit -N55- with ABS Control Module -J104-
Brake Booster with Tandem Brake Master Cylinder

WARNING:

Do not bend the brake lines near the ABS Hydraulic Unit -N55- !

Use the Vehicle Diagnostic Tester.

Chassis
Brake System
Anti-Lock Braking System ABS/ASR Mark 70
Function
Check ABS Control Module J104 Coding

NOTE:

The battery ground cable must be disconnected for the following procedure. Check if a coded radio is installed. If necessary, obtain anti-theft code beforehand.

CAUTION:

Danger of causing damage to electronic components when disconnecting the battery.

Follow the steps for disconnecting the battery.

-- Remove the noise insulation. Refer to NOISE INSULATION .

-- Remove engine cover near -arrows-.

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-- Observe the given sequence in direction of -arrows 1 through 4-.

-- Reach as far as possible under the engine cover.

CAUTION:

The bracket for attaching the engine cover to the cylinder head could break if removed incorrectly. Always follow these steps to remove the engine cover.

-- Remove the nuts -arrows- and then remove the heat shield -1- from the diesel particulate filter.

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-- Open the clips -arrows- and remove the upper toothed belt cover.

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-- Release and remove connectors -1 through 3-.

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-- Remove the particulate filter bracket bolts -1-.

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-- Loosen the clamps and remove the hoses from the particulate filter. Refer to EMISSIONS CONTROL SYSTEM (CVCA, CUUA, CUUB, DELA, DEBA, DEJA, DGMA) .

-- Raise the vehicle.

-- Loosen the clamp -1- for the turbocharger/particulate filter connection and remove it.

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NOTE:

The illustration shows the clamp bolt -1- from underneath. This can also be installed from above in some cases.

Vehicles with Absorption Catalytic Converter

-- Disconnect the exhaust system between the particulate filter and the absorption catalytic converter. Refer to EMISSIONS CONTROL SYSTEM (CVCA, CUUA, CUUB, DELA, DEBA, DEJA, DGMA) .

-- Disconnect the exhaust system after the absorption catalytic converter. Refer to EMISSIONS CONTROL SYSTEM (CVCA, CUUA, CUUB, DELA, DEBA, DEJA, DGMA) .

Continuation for All Vehicles:

-- If equipped, remove the EGR pipe from the particulate filter. Refer to EMISSIONS CONTROL SYSTEM (CVCA, CUUA, CUUB, DELA, DEBA, DEJA, DGMA) .

-- Disconnect the exhaust system. Refer to EXHAUST PIPES/MUFFLERS (CVCA, CUUA, CUUB, DELA, DEBA, DEJA, DGMA) .

-- Remove the exhaust system bracket from the subframe -arrows-.

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-- Remove the bolts -1- and remove the drive shaft cover -2-.

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-- Unbolt the right drive axle from the flange, lay it down and secure it. Refer to DRIVE AXLE .

-- Remove the nuts -1-.

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-- Remove the nuts -2- using the :T10384 .

-- Remove bracket for particulate filter -3-.

-- Seal all openings using the :VAS6122 .

-- Lower the particulate filter just enough so that it touches the steering gear.

NOTE:

Pay attention to the Exhaust Gas Temperature Sensor -- and the Heated Oxygen Sensor -- when lowering onto the cables in order to avoid any damage.

-- If equipped, remove the nut -1- and remove the heat shield -2-.

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-- Disconnect and remove the connector from the ABS Control Module -J104- in direction of -arrow-.

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-- Insert the :VAG1869/2 .

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-- Remove front left caps -1-.

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-- Remove rear left caps -1-.

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Use a Suitable Bleeder Hose

It Must Fit Tightly on the Bleeder Valve So That No Air Can Get into the Brake System

-- Attach the bleeder bottle bleed hose -1- to the left front brake caliper breather valve.

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-- Open the breather valve.

-- Attach the bleeder bottle bleed hose -1- to the brake caliper breather valve/left rear brake cylinder.

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-- Open the breather valve.

-- Push the brake pedal at least 60 mm using the :VAG1869/2 .

-- Close the left front and left rear bleeder valves.

Do not remove the :VAG1869/2 .

-- Place enough lint-free cloths under the ABS Control Module -J104- and the ABS Hydraulic Unit -N55-.

Make Sure No Brake Fluid Gets on the Contacts

-- Mark brake lines -A and B- from brake master cylinder.

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-- Remove the brake lines -A and B- from the ABS Hydraulic Unit -N55-.

-- Seal the threaded hole immediately with plugs from the assembly repair kit.

-- Close brake lines immediately using Sealing Plugs or with suitable plugs from the :VAS6122 .

-- Mark brake lines (brake calipers) -1 to 4-, unscrew and seal.

-- Seal the threaded hole immediately with plugs from the assembly repair kit.

-- Close brake lines immediately using Sealing Plugs or with suitable plugs from the :VAS6122 .

-- Remove the ABS Hydraulic Unit -N55- and the ABS Control Module -J104- in direction of -arrow- and pull upward out of the shock absorbers.

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-- Turn the ABS Hydraulic Unit -N55- with the ABS Control Module -J104- upside down.

-- Unscrew and remove the bracket -item ) OVERVIEW - ABS MARK 70 (ABS/ASR)- from the ABS Hydraulic Unit -N55- inside the engine compartment.

-- Remove the ABS Hydraulic Unit -N55- with the ABS Control Module -J104-.