specifications SUBARU LEGACY 1997 Service Repair Manual
[x] Cancel search | Manufacturer: SUBARU, Model Year: 1997, Model line: LEGACY, Model: SUBARU LEGACY 1997Pages: 3342, PDF Size: 62.95 MB
Page 2751 of 3342
10L6CHECK ABS SENSOR MECHANICAL
TROUBLE.
: Tightening torque:
32±10 N⋅m (3.3±1.0 kg-m, 24±7 ft-lb)
Are the ABS sensor installation bolts tight-
ened securely?
: Go to next.
: Tighten ABS sensor installation bolts securely.
: Tightening torque:
13±3 N⋅m (1.3±0.3 kg-m, 9±2.2 ft-lb)
Are the tone wheel installation bolts tight-
ened securely?
: Go to next step.
: Tighten tone wheel installation bolts securely.
G4M0700
1) Measure tone wheel to pole piece gap over entire
perimeter of the wheel.
: Is the gap within the specifications shown
in the following table?
SpecificationsFront wheel Rear wheel
0.9—1.4 mm
(0.035—0.055 in)0.7—1.2 mm
(0.028—0.047 in)
G4M0701
: Go to next.
: Adjust the gap.
NOTE:
Adjust the gap using spacer (Part No. 26755AA000). If
spacers cannot correct the gap, replace worn sensor or
worn tone wheel.
: Is an oscilloscope available?
: Go to next step.
: Go to step 10).
2) Raise all four wheels of ground.
3) Turn ignition switch OFF.
4) Disconnect connector from ABS control module.
5) Disconnect connector cover from connector.
6) Connect connector to ABS control module.
7) Connect the oscilloscope to the ABS control module
connector in accordance with trouble code.
8) Turn ignition switch ON.
146
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor
Page 2759 of 3342
10M2
CHECK TIRE.
: Are the tire specifications correct?
: Go to next.
: Replace tire.
: Is the tire worn excessively?
: Replace tire.
: Go to next.
: Is the tire pressure correct?
: Go to step10M3.
: Adjust tire pressure.
10M3CHECK ABS SENSOR MECHANICAL
TROUBLE.
: Tightening torque:
32±10 N⋅m (3.3±1.0 kg-m, 24±7 ft-lb)
Are the ABS sensor installation bolts tight-
ened securely?
: Go to next.
: Tighten ABS sensor installation bolts securely.
: Tightening torque:
13±3 N⋅m (1.3±0.3 kg-m, 9±2.2 ft-lb)
Are the ABS sensor installation bolts tight-
ened securely?
: Go to next step.
: Tighten ABS sensor installation bolts securely.
G4M0700
1) Measure tone wheel to pole piece gap over entire
perimeter of the wheel.
: Is the gap within the specifications shown
in the following table?
SpecificationsFront wheel Rear wheel
0.9—1.4 mm
(0.035—0.055 in)0.7—1.2 mm
(0.028—0.047 in)
154
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor
Page 2793 of 3342
B4M0964
X: 44 CCM LINE
—A COMBINATION OF AT CONTROL
ABNORMALS—
DIAGNOSIS:
Combination of AT control faults
TROUBLE SYMPTOM:
ABS does not operate.
10X1.Check specifications of ABSCM using select
monitor.
10X2.Check ground short of harness.
10X3.Check AT control module.
10X4.Check open circuit of harness.
10X5.Check poor contact in connector between AT
control module and ABSCM.
10X6.Check ABSCM.
188
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor
Page 2794 of 3342
WIRING DIAGRAM:
B4M1040
B4M0921
10X1CHECK SPECIFICATIONS OF ABSCM
USING SELECT MONITOR.
1) Press
F,
0and
0on the select monitor.
2) Read the select monitor display.
: Is an ABSCM for AT model installed on a MT
model?
: Replace ABSCM.
: Go to step10X2.
189
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor
Page 2855 of 3342
B4M0974
AH: 56 G SENSOR LINE
—OPEN OR SHORT CIRCUIT OF G SENSOR
—
DIAGNOSIS:
Faulty G sensor output voltage
TROUBLE SYMPTOM:
ABS does not operate.
10AH1.Check specifications of ABSCM using select
monitor.
10AH2.Check output of G sensor using select
monitor.
10AH3.Check poor contact in connector between
ABSCM and G sensor.
10AH4.Check ABSCM.
10AH5.Check freeze frame data.
10AH6.Check broken wire in G sensor output harness
and ground harness.
10AH7.Check poor contact in connector between
ABSCM and G sensor.
10AH8.Check ABSCM.
10AH9.Check input voltage of G sensor.
10AH10.Check broken wire in G sensor output harness
and ground harness.
Continues to next page.
250
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor
Page 2857 of 3342
B4M0921
10AH1CHECK SPECIFICATIONS OF ABSCM
USING SELECT MONITOR.
1) Press
F,
0and
0on the select monitor.
2) Read the select monitor display.
: Is an ABSCM for 4WD model installed on a
FWD model?
: Replace ABSCM.
: Go to step10AH2.
B4M0927
10AH2CHECK OUTPUT OF G SENSOR USING
SELECT MONITOR.
1) Press
F,
1and
0on the select monitor.
2) Read the select monitor display.
: Is the indicated reading 2.3±0.2 V when the
G sensor is in horizontal position?
: Go to step10AH3.
: Go to step10AH5.
10AH3CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN ABSCM AND G SENSOR.
: Is there poor contact in connector between
ABSCM and G sensor?
: Repair connector.
: Go to step10AH4.
10AH4
CHECK ABSCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the trouble code.
: Is the same trouble code as in the current
diagnosis still being output?
: Replace ABSCM.
: Go to next.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
252
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor
Page 2875 of 3342
11. General Diagnostics Table
A: SYMPTOMS AND PROBABLE CAUSES
Symptom Probable faulty units/parts
Vehicle instability during brakingVehicle pulls to either side.Hydraulic unit (solenoid valve)
ABS sensor
Brake (caliper & piston, pads)
Wheel alignment
Tire specifications, tire wear and air pressures
Incorrect wiring or piping connections
Road surface (uneven, camber)
Vehicle spins.Hydraulic unit (solenoid valve)
ABS sensor
Brake (pads)
Tire specifications, tire wear and air pressures
Incorrect wiring or piping connections
Poor brakingLong braking/stopping distanceHydraulic unit (solenoid valve)
Brake (pads)
Air in brake line
Tire specifications, tire wear and air pressures
Incorrect wiring or piping connections
Wheel locks.Hydraulic unit (solenoid valve, motor)
ABS sensor
Incorrect wiring or piping connections
Brake draggingHydraulic unit (solenoid valve)
ABS sensor
Master cylinder
Brake (caliper & piston)
Parking brake
Axle & wheels
Brake pedal play
Long brake pedal strokeAir in brake line
Brake pedal play
Vehicle pitchingSuspension play or fatigue (reduced damping)
Incorrect wiring or piping connections
Road surface (uneven)
Unstable or uneven brakingHydraulic unit (solenoid valve)
ABS sensor
Brake (caliper & piston, pads)
Tire specifications, tire wear and air pressures
Incorrect wiring or piping connections
Road surface (uneven)
Vibration and/or noise (while
driving on slippery roads)Excessive pedal vibrationIncorrect wiring or piping connections
Road surface (uneven)
Noise from hydraulic unitHydraulic unit (mount bushing)
ABS sensor
Brake piping
Noise from front of vehicleHydraulic unit (mount bushing)
ABS sensor
Master cylinder
Brake (caliper & piston, pads, rotor)
Brake piping
Brake booster & check valve
Suspension play or fatigue
Noise from rear of vehicleABS sensor
Brake (caliper & piston, pads, rotor)
Parking brake
Brake piping
Suspension play or fatigue
270
4-4cBRAKES [ABS 5.3 TYPE]
11. General Diagnostics Table
Page 2877 of 3342
1. Supplemental Restraint System
“Airbag”
Airbag system wiring harness is routed near the ABS
sensor, ABS control module and hydraulic control unit.
CAUTION:
All Airbag system wiring harness and connectors
are colored yellow. Do not use electrical test equip-
ment on these circuit.
Be careful not to damage Airbag system wiring har-
ness when servicing the ABS sensor, ABS control
module and hydraulic control unit.
2. Pre-inspection
Before performing diagnostics, check the following items
which might affect ABS problems:
A: MECHANICAL INSPECTION
1. POWER SUPPLY
1) Measure battery voltage and specific gravity of electro-
lyte.
Standard voltage: 12 V, or more
Specific gravity: Above 1.260
2) Check the condition of the main and other fuses, and
harnesses and connectors. Also check for proper ground-
ing.
2. BRAKE FLUID
1) Check brake fluid level.
2) Check brake fluid leakage.
3. BRAKE DRAG
Check brake drag.
4. BRAKE PAD AND ROTOR
Check brake pad and rotor.
5. TIRE SPECIFICATIONS, TIRE WEAR AND AIR
PRESSURE
Check tire specifications, tire wear and air pressure.
2
4-4dBRAKES [ABS 5.3i TYPE]
1. Supplemental Restraint System“Airbag”- 2. Pre-inspection
Page 2878 of 3342
1. Supplemental Restraint System
“Airbag”
Airbag system wiring harness is routed near the ABS
sensor, ABS control module and hydraulic control unit.
CAUTION:
All Airbag system wiring harness and connectors
are colored yellow. Do not use electrical test equip-
ment on these circuit.
Be careful not to damage Airbag system wiring har-
ness when servicing the ABS sensor, ABS control
module and hydraulic control unit.
2. Pre-inspection
Before performing diagnostics, check the following items
which might affect ABS problems:
A: MECHANICAL INSPECTION
1. POWER SUPPLY
1) Measure battery voltage and specific gravity of electro-
lyte.
Standard voltage: 12 V, or more
Specific gravity: Above 1.260
2) Check the condition of the main and other fuses, and
harnesses and connectors. Also check for proper ground-
ing.
2. BRAKE FLUID
1) Check brake fluid level.
2) Check brake fluid leakage.
3. BRAKE DRAG
Check brake drag.
4. BRAKE PAD AND ROTOR
Check brake pad and rotor.
5. TIRE SPECIFICATIONS, TIRE WEAR AND AIR
PRESSURE
Check tire specifications, tire wear and air pressure.
2
4-4dBRAKES [ABS 5.3i TYPE]
1. Supplemental Restraint System“Airbag”- 2. Pre-inspection
Page 2908 of 3342
8E8CHECK INSTALLATION OF TONE
WHEEL.
Tightening torque:
13±3 N⋅m (1.3±0.3 kg-m, 9±2.2 ft-lb)
: Are the tone wheel installation bolts tight-
ened securely?
: Go to step8E9.
: Tighten tone wheel installation bolts securely.
G4M0700
8E9
CHECK ABS SENSOR GAP.
Measure tone wheel-to-pole piece gap over entire perim-
eter of the wheel.
: Is the gap within the specifications shown
in the following table?
SpecificationsFront wheel Rear wheel
0.9—1.4 mm
(0.035—0.055 in)0.7—1.2 mm
(0.028—0.047 in)
G4M0701
: Go to step8E10.
: Adjust the gap.
NOTE:
Adjust the gap using spacers (Part No. 26755AA000). If
spacers cannot correct the gap, replace worn sensor or
worn tone wheel.
8E10
CHECK HUB RUNOUT.
Measure hub runout.
: Is the runout less than 0.05 mm (0.0020 in)?
: Go to step8E11.
: Repair hub.
32
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light