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Electronic Brake Control Module: Service and Repair

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

REMOVAL
1. Disconnect ground cable from battery.
2. Remove air intake duct from engine compartment to facilitate removal of ABSCM&H/U.





3. Use an air gun to get rid of water around the ABSCM&H/U.

CAUTION: The contact will be insufficient if the terminal gets wet.

4. Pull off the lock of the ABSCM&H/U connector to remove it.

CAUTION: Do not pull on harness when disconnecting the connector.

CAUTION: Be careful not to let water or other foreign matter contact the ABSCM&H/U terminal.

5. Unlock cable clip.
6. Disconnect brake pipes from ABSCM&H/U.

CAUTION: Wrap brake pipes with vinyl bag to avoid spilling brake fluid on vehicle body. Flush the vehicle completely and wipe it when applying the brake fluid to the body.

7. Remove ABSCM&H/U ground terminal from bracket.





8. Remove ABSCM&H/U from engine compartment.

CAUTION:
^ Do not drop or bump ABSCM&H/U.
^ Do not turn the ABSCM&H/U upside down or place it on its side.
^ Be careful to prevent foreign particles from getting into ABSCM&H/U.
^ Apply a coat of rust-preventive wax (Nippeco LT or GB) to bracket attaching bolt after tightening.
^ Do not pull harness when disconnecting connector.

INSTALLATION
1. Install ABSCM&H/U.

CAUTION: Confirm that the specifications of the ABSCM&H/U conforms to the vehicle specifications.

Tightening torque: 18 Nm (1.8 kgf-m, 13.0 ft. lbs.)
2. Install ABSCM&H/U ground terminal to bracket.
Tightening torque: 33 Nm (3.4 kgf-m, 24 ft. lbs.)





3. Connect brake pipes to their correct ABSCM&H/U connections.
Tightening torque: 15 Nm (1.5 kgf-m, 10.8 ft. lbs.)
4. Using cable clip, secure ABSCM&H/U harness to bracket.
5. Connect connector to ABSCM&H/U.

CAUTION:
^ Be sure to remove all foreign matter from inside the connector before connecting.
^ Ensure that the ABSCM&H/U connector is securely locked.

6. Install air intake duct.
7. Connect ground cable to battery.
8. Bleed air from the brake system.

INSPECTION
1. Check connected and fixed condition of connector.





2. Check specifications of the mark with ABSCM&H/U.

CHECKING THE HYDRAULIC UNIT ABS OPERATION BY PRESSURE GAUGE
1. Lift-up vehicle and remove wheels.
2. Disconnect the air bleeder screws from the FL and FR caliper bodies.





3. Connect two pressure gauges to the FL and FR caliper bodies.

CAUTION:
^ Pressure gauges used exclusively for brake fluid must be used.
^ Do not employ pressure gauge previously used for transmission since the piston seal is expanded which may lead to malfunction of the brake.

NOTE: Wrap sealing tape around the pressure gauge.

4. Bleed air from the pressure gauges.
5. Perform ABS sequence control.
6. When the hydraulic unit begins to work, and first the FL side performs decompression, holding, and compression, and then the FR side performs decompression, holding, and compression.





7. Read values indicated on the pressure gauge and check if the fluctuation of the values between decompression and compression meets the standard values. Also check if any irregular brake pedal tightness is felt.
8. Remove pressure gauges from FL and FR caliper bodies.
9. Remove air bleeder screws from the RL and RR caliper bodies.
10. Connect the air bleeder screws to the FL and FR caliper bodies.
11. Connect two pressure gauges to the RL and RR caliper bodies.
12. Bleed air from the pressure gauges and the FL and FR caliper bodies.
13. Perform ABS sequence control.
14. When the hydraulic unit begins to work, at first the RR side performs decompression, holding, and compression, and then the RL side performs decompression, holding, and compression.
15. Read values indicated on the pressure gauges and check if they meet the standard value.
16. After checking, remove the pressure gauges from caliper bodies.
17. Connect the air bleeder screws to AL and RR caliper bodies.
18. Bleed air from brake line.

CHECKING THE HYDRAULIC UNIT ABS OPERATION WITH BRAKE TESTER





1. In the case of AT model, install a spare fuse with the FWD connector in the main fuse box so as to simulate FWD model for checking.
2. In the case of MT mode, perform measurement with the wheels other than the applicable wheels put on the free rollers because the AWD circuit cannot be forcibly cut off.
3. Prepare for operating ABS sequence control.








4. Set the front wheels or rear wheels on the brake tester and set the select lever's position at "neutral".
5. Operate the brake tester.
6. Perform ABS sequence control.
7. Hydraulic unit begins to work; and check the following working sequence.
1 The FL wheel performs decompression, holding, and compression in sequence, and subsequently the FR wheel repeats the cycle.
2 The RR wheel performs decompression, holding, and compression in sequence, and subsequently the AL wheel repeats the cycle.





8. Read values indicated on the brake tester and check if the fluctuation of values, when decompressed and compressed, meet the standard values.
9. After checking, also check if any irregular brake pedal tightness is felt.

ABSCM (ABS CONTROL MODULE)
1. Disconnect the ground cable from battery.
2. Disconnect the ABSCM harness connector.





3. Remove the bracket mounting nut of ABSCM&H/U.
4. Leaving the brake pipe connected, raise the ABSCM&H/U for approx. 5 cm (2.0 inch) from bracket.

CAUTION: Do not deform the brake pipe.





5. Unlock the motor power supply connector lock, and disconnect the connector.
6. Using TORX BIT T20, remove the screws (1), (2), (3), (4), (5), (6) in this order.

CAUTION: Do not reuse the screw.





7. Remove the ABSCM from H/U.

CAUTION:
^ Do not pry the ABSCM out, extract it straight out against H/U.
^ Do not reuse the seal of ABSCM.

8. Check that H/U seal surface is free from dust and damages.

CAUTION:
^ If damage is found on seal surface, replace the H/U.
^ Do not apply compressed air to ABSCM&H/U for cleaning.

9. Install ABSCM straight for ward on to H/U, being careful not to scratch the valve.
10. Temporarily tighten the six new screws by hand.





11. Using TORX BIT T20, tighten the screws (1), (2), (3), (4), (5), (6) in this order.
Tightening torque: 2.65 Nm (0.27 kgf-m, 1.95 ft. lbs.)
12. Make sure no clearance exists at the mating surface of ABSCM and H/U.
13. Connect the motor power supply connector to ABSCM.

CAUTION: Securely connect the connector until connector lock sound is heard.

14. Attach the ABSCM&H/U to bracket, and then tighten with nuts.
Tightening torque: 18 Nm (1.8 kgf-m, 13.0 ft. lbs.)
15. Connect the ABSCM harness connector.
16. Connect the battery ground cable to battery.
17. Turn the ignition key to ON. Check the ABS warning light turns on normally, then off.
18. Check that correct information (model year,drive system, transmission type) is displayed on the initial screen by connecting Subaru Select Monitor.
19. Start the engine and move the car to accelerate to more than 20 km/h (12.4 MPH). Check the ABS warning light dose not turn on.
20. If any abnormal is found during the work of step 17 to 19, repair according to the procedure of relevant failure in "ABS (DIAGNOSTICS)".
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