Control Module, Separating From Hydraulic Unit

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Special tools and workshop equipment required

Torque Screwdriver VAG1624 1-5 Nm with external Torx socket E6
ESD Work Surface VAS6613

Replacing Control Modules

Replace the control module:

If it has been determined by the Vehicle Diagnostic Tester that the control module is faulty "Control Module Faulty".
If there is visible damage to the control module housing or to the connector.

CAUTION:

A control module that was removed may not be attached to a different hydraulic unit.

NOTE:

Before removing control module, read out DTC memory and print out fault code if necessary.

The control module and the hydraulic unit can be separated.

The ABS Hydraulic Unit -N55- with the ABS Control Module -J104- must be removed in order to separate the control module and the hydraulic unit.

The replacement should only be done by trained personnel.

Only the new parts in the repair kit may be used.
Only new screws may be used for attaching the control module to the hydraulic unit.
The seal on the control module must not be pulled out or raised up.
The seal on the control module cannot be replaced.
Cleaning the control module or hydraulic unit with compressed air is not permitted.
The valve coils inside the control module cannot be adjusted.
The valve coils inside the control module cannot be replaced.
The pressure sensor must be changed or damaged.
The pressure sensor cannot be replaced.
Do not place anything on the sensor housing.
It is not possible to perform any measurements on the contacts inside the control module.
It is not possible to perform any measurements on the contacts inside the hydraulic unit.
The valve bodies inside the hydraulic unit must not be damaged or bent.
The contacts cannot be replaced.
Do not use contact spray on the contacts and pressure sensor.
Make sure there are no foreign objects between the control module and the hydraulic unit.

Removing

CAUTION:

Separate the ABS Control Module -J104- from the ABS Hydraulic Unit -N55- only when they are removed.

-- Remove the hydraulic unit, refer to ABS Control Module -J104- /ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING .

NOTE:

The ESD Work Surface VAS6613 has sufficient grounding to protect against an electrostatic discharge.

-- Place the hydraulic unit with the control module onto the ESD Work Surface VAS6613.

The control module -2- faces up and the hydraulic unit -4- with the pump motor and connector -3- faces down.

Fig 1: Identifying Hydraulic Unit
Courtesy of AUDI OF AMERICA, LLC

-- Remove and dispose of the bolts -1-.

-- Remove the control module upward holding it vertically.

NOTE:

Be careful not the hook the valve coils when removing them otherwise the valve coils could get stuck on the mount.

CAUTION:

There is a risk of destroying the hydraulic unit.

Cover the open hydraulic unit. Protect the hydraulic unit, the sealing surfaces, the valve bodies and the pressure sensor from dirt or from getting damaged.
Do not use battery voltage to check the pump motor otherwise contact surfaces could get burned.
Protect the contact surfaces on the pressure sensor against mechanical damage and electrostatic discharge. the ESD Work Surface VAS6613 grounds the technician sufficiently to protect again overcharging components.