Control Module, Separating From Hydraulic Unit
Special tools and workshop equipment required
- ESD Work Surface :VAS6613
This procedure contains mandatory replaceable parts. Refer to component overview prior to starting procedure.
Mandatory Replacement Parts
- Bolts - Control Module to Hydraulic Unit
The transverse and longitudinal acceleration sensors are installed in the ABS Control Module -J104-. The sensors cannot be replaced.
If the ABS Control Module -J104- is faulty, it can be replaced separately.
If the ABS Hydraulic Unit -N55- is faulty, it must be replaced together with the ABS Control Module -J104-.
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.
There is a risk of destroying the hydraulic unit.
- The return flow pump may not be removed from the ABS Hydraulic Unit -N55-.
- The circuit board is exposed when the ABS Control Module -J104- is removed.
- Moisture and dirt must not enter the control module.
- Avoid electrostatic charge. Touching electronic components can cause malfunctions.
- The seal on the control module must not be pulled out or raised up.
- Blowing the control module or hydraulic unit out with compressed air is not permitted.
- The valve bodies inside the hydraulic unit must not be damaged or bent.
Procedure
-- Remove the hydraulic control unit. Refer to ABS Control Module -J104- /ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING .
There is a risk of destroying the hydraulic unit.
- Touch a grounded object (ESD Work Surface :VAS6613 before disconnecting the components.
- Do not touch the connector terminals or electronic components directly.
-- Place the hydraulic unit with the control module on the ESD Work Surface :VAS6613 .
- The control module -2- faces upward and the hydraulic unit -4- with the pump motor and connector -3- faces down.
-- Remove the bolts -1- and dispose of them.
-- Carefully remove the control module vertically upward without tilting.
-- Cover the open hydraulic unit with a lint-free cloth.
-- Check the hydraulic unit sealing surface, and if necessary, clean with mineral spirits and a lint-free cloth.
-- A damaged sealing surface must not be mechanically reworked. A hydraulic unit with a damaged sealing surface must be replaced.
There is a risk of destroying the hydraulic unit.
- The seal must not be pulled out or raised up. The seal cannot be replaced.