1996 SUBARU LEGACY Brakes

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)
155
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

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.
8) Turn ignition switch ON.
B4M0816A
9) Rotate wheels and measure voltage at specified fre-
quency.
NOTE:
When this inspection is completed, the ABS control mod-
ule sometimes stores the trouble code 29.
TROUBLE CODE / Connector & terminal:
(F49) No. 14 (+)—No. 15 () (Front RH)
(F49) No. 49 (+)—No. 19 () (Front LH)
(F49) No. 18 (+)—No. 46 () (Rear RH)
(F49) No. 16 (+)—No. 17 () (Rear LH)
Specified voltage: 0.12—1 V (When it is 20 Hz.)
: Is oscilloscope pattern smooth, as shown in
figure?
: Go to step10M4.
: Go to next step.
10) Remove disc rotor from hub.
: Is the ABS sensor pole piece or the tone
wheel contaminated by dirt or other foreign
matter?
: Thoroughly remove dirt or other foreign matter.
: Go to next.
156
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

: Are there broken or damaged teeth in the
ABS sensor pole piece or the tone wheel?
: Replace ABS sensor or tone wheel.
: Go to next step.
11) Measure hub runout.
: Is the runout less than 0.05 mm (0.0020 in)?
: Go to step10M4.
: Repair hub.
10M4
CHECK ABSCM.
1) Turn ignition switch to OFF.
2) Connect all connectors.
3) Erase the memory.
4) Perform inspection mode.
5) 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.
157
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0953
N: 31 FR. EV VALVE
—ABNORMAL FRONT RH INLET SOLENOID
VA LV E—
B4M0954
O: 33 FL. EV VALVE
—ABNORMAL FRONT LH INLET SOLENOID
VA LV E—
B4M0955
P: 35 RR. EV VALVE
—ABNORMAL REAR RH INLET SOLENOID
VA LV E—
B4M0956
Q: 37 RL. EV VALVE
—ABNORMAL REAR LH INLET SOLENOID
VA LV E—
158
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

DIAGNOSIS:

Faulty harness/connector

Faulty inlet solenoid valve in hydraulic unit
TROUBLE SYMPTOM:

ABS does not operate.
10Q1.Check freeze frame data.



10Q2.Check the condition when the trouble
occurred.
10Q3.Check resistance of solenoid valve.
10Q4.Check ground short of solenoid valve.
10Q5.Check ground short of harness.
10Q6.Check harness connector between ABSCM
and hydraulic unit.
10Q7.Check poor contact in connector between
ABSCM and hydraulic unit.
10Q8.Check ABSCM.
10Q9.Check battery short of solenoid valve.
10Q10.Check battery short of harness.
10Q11.Check resistance of solenoid valve.
10Q12.Check ground short of solenoid valve.
Continues to next page.










159
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

From the former page.
10Q13.
Check battery short of solenoid valve.
10Q14.Check battery short of harness.
10Q15.Check ground short of harness.
10Q16.Check harness connector between ABSCM
and hydraulic unit.
10Q17.Check poor contact in connector between
ABSCM and hydraulic unit.
10Q18.Check ABSCM.






160
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

WIRING DIAGRAM:
B4M1046
B4M0957A
10Q1
CHECK FREEZE FRAME DATA.
Press F,E,1and 5on the select monitor.
: Is the select monitor LED 5 off? Was the
ABS inactive when the problem occurred?
: Go to step10Q2.
: Go to step10Q11.
161
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

10Q2CHECK THE CONDITION WHEN THE
TROUBLE OCCURRED.
Ask the vehicle owner about driving conditions when the
trouble occurred. Attempt to duplicate the conditions.
: Is the trouble immediately apparent?
: Go to next.
: Go to step 11.
: Did the trouble occur immediately after
engine starting or during standing starts?
: Go to step10Q9.
: Go to step10Q3.
B4M0824B
10Q3CHECK RESISTANCE OF SOLENOID
VA LV E .
1) Turn ignition switch to OFF.
2) Disconnect two connectors (ABS1, F9) from hydraulic
unit.
3) Measure resistance between hydraulic unit connector
terminals.
: Trouble code/Connector & terminal
31/to (F9) No. 4—to (ABS1) No. 2
33/to (F9) No. 1—to (ABS1) No. 2
35/to (F9) No. 2—to (ABS1) No. 2
37/to (F9) No. 3—to (ABS1) No. 2
Is resistance 8.5±0.7Ω?
: Go to step10Q4.
: Replace hydraulic unit.
162
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor