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ABS Control Module and Hydraulic Control Unit (ABSCM&H/U): Replacement

CAUTION:
  • Because the seal of the ABSCM cannot be replaced, do not pull or peel it by lifting it up.
  • Because the screw of the H/U will become slightly worn in every replacement procedure, 5 times is the maximum number of times for replacement. If a problem is found such as not being able to torque the screw to specifications even before 5 replacement operations are performed, replace the H/U body.
  • When installing the ABSCM, always use new screws.
  • When the sealing surface of the ABSCM or H/U is dirty or damaged and it cannot be removed or repaired, replace with a new part.
  1. Remove the ABSCM&H/U bracket. Ref. to REMOVAL , ABS Control Module and Hydraulic Control Unit (ABSCM&H/U).
  2. To prevent entry of foreign objects and brake fluid leakage, plug the oil pressure port of the ABSCM&H/U using a screw plug, etc.
  3. Set the pump motor section of the removed ABSCM&H/U face down on a vise.
    NOTE: Before securing a part in a vise, place cushioning material such as wood blocks, aluminum plate or cloth between the part and the vise.
    Fig 1: Identifying Pump Motor
    G06339271Courtesy of SUBARU OF AMERICA, INC.
  4. Using TORX® bit E5, remove the four screws of ABSCM.
    NOTE: These screws cannot be reused.
    Fig 2: Identifying Screws Of ABSCM
    G05003731Courtesy of SUBARU OF AMERICA, INC.
  5. Slowly pull out the ABSCM upward from the H/U.
    NOTE: To prevent damaging of coil section, remove the ABSCM straight up from H/U without twisting.
  6. Make sure there is no dirt or damage on the sealing surface of the H/U.
    CAUTION:
    • Do not clean the ABSCM and H/U by applying compressed air.
    • Even if damage is found on the H/U seal, do not attempt repair by filing or with a metal scraper. To remove the seal residue, always use a plastic scraper. Do not use chemical such as paint thinner, etc., to clean.
  7. Position the coil of the new ABSCM to align with the H/U valve.
  8. To prevent deformation of the ABSCM housing cover, hold the corner of ABSCM and install it to the H/U without tilting.
  9. Using a TORX® bit E5, attach/tighten new screws in the order of (1) through (4).
    CAUTION: Always use new screws.

    Tightening torque: 

    1.5 N.m (0.15 kgf-m, 1.1 ft-lb) 

    Fig 3: Identifying ABSCM Screws Tightening Sequence
    G05003732Courtesy of SUBARU OF AMERICA, INC.
  10. Check that there is no foreign matter in mating surface between the ABSCM and H/U.
  11. Using a TORX® bit E5, tighten the screws in the order of (1) through (4) again.

    Tightening torque: 

    3 N.m (0.3 kgf-m, 2.2 ft-lb) 

  12. Check that there is no gap in the mating surface between ABSCM and H/U.
  13. Install the ABSCM&H/U to the vehicle.
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