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Vehicle Dynamics Control: Other Subaru Outback BH

Anti-Lock/traction Control 30 illustrations ~2635 words

CAUTION

  1. Wear working clothing, including, a cap, protective goggles, and protective shoes during operation.
  2. Remove contamination including dirt and corrosion before removal, installation or disassembly.
  3. Keep the disassembled parts in order and protect them from dust or dirt.
  4. Before removal, installation or disassembly, be sure to clarify the failure. Avoid unnecessary removal, installation, disassembly, and replacement.
  5. Be careful not to burn your hands, because each part on the vehicle is hot after running.
  6. Be sure to tighten fasteners including bolts and nuts to the specified torque.
  7. Place shop jacks or safety stands at the specified points.
  8. Before disconnecting electrical connectors of sensors or units, be sure to disconnect negative terminal from battery.

Identifying Special Tools. Scheme 79

Scheme 79: Identifying Special Tools
Scheme 79: Identifying Special Tools

General Purpose Tool Chart. Scheme 80

Scheme 80: General Purpose Tool Chart
Scheme 80: General Purpose Tool Chart

Scheme 81

Scheme 81: REMOVAL
Scheme 81: REMOVAL

Scheme 82

Scheme 82
Scheme 82

Scheme 83

Scheme 83
Scheme 83

Scheme 84

Scheme 84
Scheme 84

Scheme 85

Scheme 85
Scheme 85
  1. Disconnect battery ground cable. (Scheme 81): Disconnecting Battery Ground Cable
  2. Remove lower cover of instrument panel and disconnect connectors on the back side of the cover. (Scheme 82): Removing Lower Cover Of Instrument Panel
  3. Remove three bolts which secure the fuse box onto body side, then move the fuse box aside. (Scheme 83): Identifying Fuse Box Bolts
  4. Remove two bolts which install VDCCM onto body side bracket. (Scheme 84): Identifying VDCCM Bolts
  5. Disconnect connector from VDCCM by pulling up the securing holder. (Scheme 85): Disconnecting VDCCM Connector
  6. Remove VDCCM.

WITHOUT SUBARU SELECT MONITOR

  1. Park the vehicle in a straight ahead position on a horizontal surface.
  2. Confirm the steering wheel center position. (If the center position is not accurate, adjust wheel alignment.)
  3. Drive the vehicle approx. 10 km (6 MPH) preferably on a straight road, then turn ignition switch OFF. Then drive the vehicle approx. 10 km (6 MPH) again confirming that ABS and VDC warning lights do not go ON while vehicle is being driven. Also make sure there are no abnormalities of the VDC function or steering operation. NOTE: If it is not possible to drive the vehicle, use SUBARU SELECT MONITOR. See «ADJUSTMENT»(ref-177384-S07457678332005052700000) .
  4. If there are any abnormalities found, conduct the procedure over again.

WITH SUBARU SELECT MONITOR

  1. Park the vehicle in a straight ahead position on a horizontal surface. (Engine running in gear position of P or N)
  2. Confirm the steering wheel center position. (If the center position is not accurate, adjust wheel alignment.)
  3. Set the SUBARU SELECT MONITOR on the vehicle and select "Set Mode Str.A.Sen.N & Lat.Gsen.Op" in "Function Check Sequence" display menu. (Follow the instructions in the display.)
  4. Select "Current Data display & Save" in {Brake Control System} display menu and confirm if the steering angle sensor is indicated as "0 deg".
  5. If the display does not indicate {0 deg}, conduct the procedure over again and make sure it indicates "0 deg".
  6. Drive the vehicle approx. 10 minutes and confirm that ABS and VDC warning lights do not go ON while vehicle is being driven.
  7. If there are any abnormalities in VDC function or steering operation found while vehicle is being driven, conduct the procedure over again.

Scheme 86

Scheme 86: HYDRAULIC UNIT (H/U)
Scheme 86: HYDRAULIC UNIT (H/U)

Scheme 87

Scheme 87
Scheme 87
  1. Disconnect ground cable from battery. (Scheme 86): Disconnecting Ground Cable
  2. Remove air intake duct from engine compartment to facilitate removal of hydraulic unit.
  3. Disconnect connector from hydraulic unit. CAUTION: Be careful not to let water or other foreign matter contact the H/U terminal.
  4. Unlock cable clip.
  5. Disconnect brake pipes from hydraulic unit. CAUTION: Wrap brake pipes with vinyl bag to avoid spilling brake fluid on vehicle body.
  6. Remove nuts and bolt which secure hydraulic unit bracket, and remove hydraulic unit from engine compartment. CAUTION: Hydraulic unit cannot be disassembled. Do not attempt to loosen bolts and nuts. Do not drop or bump hydraulic unit. Do not turn the hydraulic unit upside down or place it on its side. Be careful to prevent foreign particles from getting into hydraulic unit. When a new hydraulic unit is installed, apply a coat of rust-preventive wax (Nippeco LT or GB) to bracket attaching bolt after tightening. Do not pull harness disconnecting harness connector. (Scheme 87): Removing Hydraulic Unit From Engine Compartment

Scheme 88

Scheme 88: RELAY BOX
Scheme 88: RELAY BOX
  1. Disconnect ground cable from battery.
  2. Remove air intake duct from engine compartment to facilitate removal of relay box.
  3. Disconnect connector from relay box.
  4. Unlock cable clip.
  5. Remove nuts which secure relay box, and remove relay box and connector bracket. (Scheme 88): Remove Relay Box & Connector Bracket CAUTION: Do not drop or bump relay box.

Scheme 89

Scheme 89: HYDRAULIC UNIT (H/U)
Scheme 89: HYDRAULIC UNIT (H/U)

Scheme 90

Scheme 90
Scheme 90
  1. Install hydraulic unit. (Scheme 89): Installing Hydraulic Unit Tightening torque: 18 N.m (1.8 kgf-m, 13.0 ft-lb)
  2. Connect hydraulic unit ground cable to body. Tightening torque: 33 N.m (3.4 kgf-m, 25 ft-lb)
  3. Connect brake pipes to their correct hydraulic unit connections.
  4. Secure hydraulic unit connector to connector bracket. CAUTION: Align connector with mating receptacle.
  5. Connect connector to hydraulic unit. (Scheme 90): Connecting Connectors To Hydraulic Unit
  6. Install air intake duct.
  7. Connect ground cable to battery.
  8. Bleed air from the brake system.

Scheme 91

Scheme 91: RELAY BOX
Scheme 91: RELAY BOX

Scheme 92

Scheme 92
Scheme 92
  1. Install relay box and connector bracket. Tightening torque: 18 N.m (1.8 kgf-m, 13.0 ft-lb) (Scheme 91): Installing Relay Box & Connector Bracket
  2. Secure relay box connector to connector bracket. CAUTION: Align connector with mating receptacle.
  3. Connect connector to relay box. (Scheme 92): Connecting Connectors To Relay Box
  4. Install air intake duct.
  5. Connect ground cable to battery.

Scheme 93

Scheme 93: INSPECTION
Scheme 93: INSPECTION
  1. Check connected and fixed condition of connector.
  2. Check valve relay and motor relay for discontinuity or short circuits. (Scheme 93): Valve Relay & Motor Relay Chart

Scheme 94

Scheme 94: CHECKING THE HYDRAULIC UNIT ABS OPERATION BY PRESSURE GAUGE
Scheme 94: CHECKING THE HYDRAULIC UNIT ABS OPERATION BY PRESSURE GAUGE

Scheme 95

Scheme 95
Scheme 95
  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. (Scheme 94): Connecting Pressure Gauge
  4. Bleed air from the pressure gauges.
  5. Perform ABS sequence control. See «ABS SEQUENCE CONTROL»(ref-177384-S41881364632005052700000).
  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. (Scheme 95): Pressure Readings Chart
  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. See «ABS SEQUENCE CONTROL»(ref-177384-S41881364632005052700000).
  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 values.
  16. After checking, remove the pressure gauges from caliper bodies.
  17. Connect the air bleeder screws to RL and RR caliper bodies.
  18. Bleed air from brake line.

Scheme 96

Scheme 96: CHECKING THE HYDRAULIC UNIT ABS OPERATION WITH BRAKE TESTER
Scheme 96: CHECKING THE HYDRAULIC UNIT ABS OPERATION WITH BRAKE TESTER

Scheme 97

Scheme 97
Scheme 97

Scheme 98

Scheme 98
Scheme 98
  1. Prepare for operating ABS sequence control. See «ABS SEQUENCE CONTROL»(ref-177384-S41881364632005052700000).
  2. Set the front wheels or rear wheels on the brake tester and set the select lever's position at "neutral". (Scheme 96): Setting The Front Wheels On The Brake Tester (Scheme 97): Setting The Rear Wheels On The Brake Tester
  3. Operate the brake tester.
  4. Perform ABS sequence control. See «ABS SEQUENCE CONTROL»(ref-177384-S41881364632005052700000).
  5. When the hydraulic unit begins to work, check the following working sequence. The FL wheel performs decompression, holding, and compression in sequence, and subsequently the FR wheel repeats the cycle. The RR wheel performs decompression, holding, and compression in sequence, and subsequently the RL wheel repeats the cycle.
  6. Read values indicated on the brake tester and check if the fluctuation of values, when decompressed and compressed, meet the standard values. (Scheme 98): Pressure Readings Chart
  7. After checking, also check if any irregular brake pedal tightness is felt.

Scheme 99

Scheme 99: CHECKING THE HYDRAULIC UNIT VDC OPERATION BY PRESSURE GAUGE
Scheme 99: CHECKING THE HYDRAULIC UNIT VDC OPERATION BY PRESSURE GAUGE

Scheme 100

Scheme 100
Scheme 100
  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. (Scheme 99): Connecting Pressure Gauge
  4. Bleed air from the pressure gauges.
  5. Perform VDC sequence control. See «VDC SEQUENCE CONTROL»(ref-177384-S23318408762005052700000).
  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. (Scheme 100): Pressure Readings Chart
  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 VDC sequence control. See «VDC SEQUENCE CONTROL»(ref-177384-S23318408762005052700000).
  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 RL and RR caliper bodies.
  18. Bleed air from brake line.

Scheme 101

Scheme 101: CHECKING THE HYDRAULIC UNIT VDC OPERATION WITH BRAKE TESTER
Scheme 101: CHECKING THE HYDRAULIC UNIT VDC OPERATION WITH BRAKE TESTER

Scheme 102

Scheme 102
Scheme 102

Scheme 103

Scheme 103
Scheme 103
  1. Prepare for operating VDC sequence control. See «VDC Sequence Control»(ref-177384-S23318408762005052700000).
  2. Set the front wheels or rear wheels on the brake tester and set the select lever's position at "neutral". (Scheme 101): Setting The Front Wheels On The Brake Tester (Scheme 102): Setting The Rear Wheels On The Brake Tester
  3. Operate the brake tester.
  4. Perform ABS sequence control. See «ABS SEQUENCE CONTROL»(ref-177384-S41881364632005052700000).
  5. When the hydraulic unit begins to work, check the following working sequence. The FL wheel performs decompression, holding, and compression in sequence, and subsequently the FR wheel repeats the cycle. The RR wheel performs decompression, holding, and compression in sequence, and subsequently the RL wheel repeats the cycle.
  6. Read values indicated on the brake tester and check if the fluctuation of values, when decompressed and compressed, meet the standard values. (Scheme 103): Pressure Readings Chart
  7. After checking, also check if any irregular brake pedal tightness is felt.

ABS SEQUENCE CONTROL WITH SELECT MONITOR

Note. In the event of any trouble, the sequence control may not be operative. In such a case, activate the sequence control. See ABS SEQUENCE CONTROL . When the diagnosis terminal is connected to the diagnosis connector, the sequence control will not operate.

  1. Connect select monitor to data link connector beside driver's seat instrument panel lower cover.
  2. Turn ignition switch ON.
  3. Turn select monitor switch ON.
  4. Put select monitor to "BRAKE CONTROL" mode.
  5. When "Function check sequence" is selected, 'ABS sequence control' will start.
  6. The message 'Press Brake Pedal Firmly' is displayed as follows: When using the brake tester, depress brake pedal with braking force of 981 N (100 kg, 221 lb). When using the pressure gauge, depress brake pedal so as to make the pressure gauge indicate 3,432 kPa (35 kg/cm 2 , 498 psi). CAUTION: Do not depress the clutch pedal.
  7. When the message "Press YES" is displayed, press YES key.
  8. Operation points will be displayed on select monitor.

ABS Sequence Control Chart. Scheme 104

Scheme 104: ABS Sequence Control Chart
Scheme 104: ABS Sequence Control Chart

Note. When select monitor is used, control operation starts at point A. The patterns from IGN key ON to the point A show that operation is started by diagnosis connector. HIGH means high voltage. LOW means low voltage.

CONDITIONS FOR COMPLETION OF ABS SEQUENCE CONTROL

When the following conditions develop, the ABS sequence control stops and ABS operation is returned to the normal control mode.

  1. When the speed of at least one wheel reaches 10 km/h (6 MPH).
  2. When terminal No. 5 or No. 8 are separated from diagnosis terminals. (When select monitor is not used.)
  3. When the brake pedal is released during sequence control and the braking lamp switch is set to off.
  4. When brake pedal is depressed after ignition key is turned to ON, and before ABS warning light goes out. (When select monitor is not used.)
  5. When brake pedal is not depressed after ignition key is turned to ON, and within 0.5 seconds after ABS warning light goes out. (When select monitor is not used.)
  6. After completion of the sequence control.
  7. When malfunction is detected. (When select monitor is used.)

VDC SEQUENCE CONTROL WITH SELECT MONITOR

Note. In the event of any trouble, the sequence control may not be operative. In such a case, activate the sequence control. See VDC SEQUENCE CONTROL . When the diagnosis terminal is connected to the diagnosis connector, the sequence control will not operate.

  1. Connect select monitor to data link connector beside driver's seat instrument panel lower cover.
  2. Turn ignition switch ON.
  3. Turn select monitor switch ON.
  4. Put select monitor to "BRAKE CONTROL" mode.
  5. Select "VDC Check Mode" in {Function check sequence} menu to start 'VDC sequence control'. CAUTION: Do not depress the clutch pedal.
  6. When the message "Press YES" is displayed, press [YES] key.
  7. Operation points will be displayed on select monitor.

VDC Sequence Control Chart. Scheme 105

Scheme 105: VDC Sequence Control Chart
Scheme 105: VDC Sequence Control Chart

Note. When select monitor is used, control operation starts at point A. The patterns from IGN key ON to the point A show that operation is started by diagnosis connector. HIGH means high voltage. LOW means low voltage.

CONDITIONS FOR COMPLETION OF VDC SEQUENCE CONTROL

When the following conditions develop, the VDC sequence control stops and VDC operation is returned to the normal control mode.

  1. When the speed of at least one wheel reaches 10 km/h (6 MPH).
  2. When terminal No. 5 or No. 8 are separated from diagnosis terminals. (When select monitor is not used.)
  3. When the brake pedal is released during sequence control and the braking lamp switch is set to off.
  4. When brake pedal is depressed after ignition key is turned to ON, and before VDC warning light goes out. (When select monitor is not used.)
  5. When brake pedal is not depressed after ignition key is turned to ON, and within 0.5 seconds after VDC warning light goes out. (When select monitor is not used.)
  6. After completion of the sequence control.
  7. When malfunction is detected. (When select monitor is used.)

Scheme 106

Scheme 106: REMOVAL
Scheme 106: REMOVAL

Scheme 107

Scheme 107
Scheme 107

Scheme 108

Scheme 108
Scheme 108
  1. Disconnect battery ground cable. (Scheme 106): Disconnecting Battery Ground Cable
  2. Remove console cover. See «CONSOLE BOX»(ref-175480-S32453047232005042100000).
  3. Disconnect connector from yaw rate and lateral G sensor.
  4. Remove yaw rate and lateral G sensor. CAUTION: Do not drop or bump yaw rate and lateral G sensor. (Scheme 107): Removing Yaw Rate & Lateral G Sensor
  5. Remove bracket from body. (Scheme 108): Removing Bracket

Front ABS Sensor

Note. The ABS sensor installed on VDC equipped vehicles is the same as the one on ABS equipped vehicles; therefore, for removal, inspection and installation, see ANTI-LOCK BRAKING SYSTEM .

Rear ABS Sensor

Note. The ABS sensor installed on VDC equipped vehicles is the same as the one on ABS equipped vehicles; therefore, for removal, inspection and installation, see REAR ABS SENSOR .

Front Tone Wheel

Note. As front tone wheel is integrated with front drive shaft, for removal, installation, and inspection procedures. See AXLE SHAFTS - FRONT .

Rear Tone Wheel

Note. As rear tone wheel is integrated with rear drive shaft. For removal, installation, and inspection procedures. See AXLE SHAFTS - REAR .

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