1996 SUBARU LEGACY Chassis

B4M0826B
8E3CHECK BATTERY SHORT OF SOLENOID
VA LV E .
1) Disconnect connector from ABSCM.
2) Turn ignition switch to ON.
3) Measure voltage between hydraulic unit connector and
chassis ground.
: Trouble code/Connector & terminal
31/to (F9) No. 4 (+)—Chassis ground ()
33/to (F9) No. 1 (+)—Chassis ground ()
35/to (F9) No. 2 (+)—Chassis ground ()
37/to (F9) No. 3 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Replace hydraulic unit.
4) Turn ignition switch to OFF.
5) Measure voltage between hydraulic unit connector and
chassis ground.
: Trouble code/Connector & terminal
31/to (F9) No. 4 (+)—Chassis ground ()
33/to (F9) No. 1 (+)—Chassis ground ()
35/to (F9) No. 2 (+)—Chassis ground ()
37/to (F9) No. 3 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step8E4.
: Replace hydraulic unit.
B4M0827A
8E4
CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between ABSCM connector and chas-
sis ground.
: Trouble code/Connector & terminal
31/(F49) No. 30 (+)—Chassis ground ()
33/(F49) No. 24 (+)—Chassis ground ()
35/(F49) No. 23 (+)—Chassis ground ()
37/(F49) No. 31 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Repair harness between ABSCM and hydraulic
unit.
50
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

3) Turn ignition switch to OFF.
4) Measure voltage between ABSCM connector and chas-
sis ground.
: Trouble code/Connector & terminal
31/(F49) No. 30 (+)—Chassis ground ()
33/(F49) No. 24 (+)—Chassis ground ()
35/(F49) No. 23 (+)—Chassis ground ()
37/(F49) No. 31 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step8E5.
: Repair harness between ABSCM and hydraulic
unit.
B4M0828A
8E5
CHECK GROUND SHORT OF HARNESS.
Measure resistance between ABSCM connector and chas-
sis ground.
: Trouble code/Connector & terminal
31/(F49) No. 30—Chassis ground
33/(F49) No. 24—Chassis ground
35/(F49) No. 23—Chassis ground
37/(F49) No. 31—Chassis ground
Is resistance more than 1 MΩ?
: Go to step8E6.
: Repair harness between ABSCM and hydraulic
unit.
51
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

B4M0831B
8F1CHECK 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
32/to (F9) No. 8—to (ABS1) No. 2
34/to (F9) No. 5—to (ABS1) No. 2
36/to (F9) No. 6—to (ABS1) No. 2
38/to (F9) No. 7—to (ABS1) No. 2
Is resistance 4.3±0.5Ω?
: Go to step8F2.
: Replace hydraulic unit.
B4M0832B
8F2CHECK GROUND SHORT OF SOLENOID
VA LV E .
Measure resistance between hydraulic unit connector and
chassis ground.
: Trouble code/Connector & terminal
32/to (F9) No. 8—Chassis ground
34/to (F9) No. 5—Chassis ground
36/to (F9) No. 6—Chassis ground
38/to (F9) No. 7—Chassis ground
Is resistance more than 1 MΩ?
: Go to step8F3.
: Replace hydraulic unit.
55
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

B4M0833B
8F3CHECK BATTERY SHORT OF SOLENOID
VA LV E .
1) Disconnect connector from ABSCM.
2) Turn ignition switch to ON.
3) Measure voltage between hydraulic unit connector and
chassis ground.
: Trouble code/Connector & terminal
32/to (F9) No. 8 (+)—Chassis ground ()
34/to (F9) No. 5 (+)—Chassis ground ()
36/to (F9) No. 6 (+)—Chassis ground ()
38/to (F9) No. 7 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Replace hydraulic unit.
4) Turn ignition switch to OFF.
5) Measure voltage between hydraulic unit connector and
chassis ground.
: Trouble code/Connector & terminal
32/to (F9) No. 8 (+)—Chassis ground ()
34/to (F9) No. 5 (+)—Chassis ground ()
36/to (F9) No. 6 (+)—Chassis ground ()
38/to (F9) No. 7 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step8F4.
: Replace hydraulic unit.
B4M0834A
8F4
CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between ABSCM connector and chas-
sis ground.
: Trouble code/Connector & terminal
32/(F49) No. 3 (+)—Chassis ground ()
34/(F49) No. 51 (+)—Chassis ground ()
36/(F49) No. 50 (+)—Chassis ground ()
38/(F49) No. 4 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Repair harness between ABSCM and hydraulic
unit.
56
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

3) Turn ignition switch to OFF.
4) Measure voltage between ABSCM connector and chas-
sis ground.
: Trouble code/Connector & terminal
32/(F49) No. 3 (+)—Chassis ground ()
34/(F49) No. 51 (+)—Chassis ground ()
36/(F49) No. 50 (+)—Chassis ground ()
38/(F49) No. 4 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step8F5.
: Repair harness between ABSCM and hydraulic
unit.
B4M0835A
8F5
CHECK GROUND SHORT OF HARNESS.
Measure resistance between ABSCM connector and chas-
sis ground.
: Trouble code/Connector & terminal
32/(F49) No. 3—Chassis ground
34/(F49) No. 51—Chassis ground
36/(F49) No. 50—Chassis ground
38/(F49) No. 4—Chassis ground
Is resistance more than 1 MΩ?
: Go to step8F6.
: Repair harness between ABSCM and hydraulic
unit.
57
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

B4M0838A
8G1
CHECK GROUND CIRCUIT OF ABSCM.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM.
3) Measure resistance between ABSCM and chassis
ground.
: Connector & terminal
(F49) No. 1—Chassis ground
(F49) No. 55—Chassis ground
Is resistance less than 0.5Ω?
: Go to step8G2.
: Repair ABSCM ground harness.
8G2CHECK POOR CONTACT IN CONNEC-
TORS BETWEEN BATTERY, IGNITION
SWITCH AND ABSCM.
: Is there poor contact in connectors between
battery, ignition switch and ABSCM?
: Repair connector.
: Go to step8G3.
8G3
CHECK SOURCES OF SIGNAL NOISE.
: Is the car telephone or the wireless trans-
mitter properly installed?
: Go to next.
: Properly install the car telephone or the wireless
transmitter.
: Are noise sources (such as an antenna)
installed near the sensor harness?
: Install the noise sources apart from the sensor
harness.
: Go to step8G4.
60
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

B4M0430
8H1
CHECK GENERATOR.
1) Start engine.
2) Idling after warm-up.
3) Measure voltage between generator B terminal and
chassis ground.
: Terminal
Generator B terminal—Chassis ground
Is voltage 10—15 V?
: Go to step8H2.
: Repair generator.
8H2
CHECK BATTERY TERMINAL.
Turn ignition switch to OFF.
: Are the positive and negative battery termi-
nals tightly clamped?
: Go to step8H3.
: Tighten the clamp of terminal.
B4M0842A
8H3
CHECK INPUT VOLTAGE OF ABSCM.
1) Disconnect connector from ABSCM.
2) Run the engine at idle.
3) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(F49) No. 28 (+)—Chassis ground ()
Is voltage 10—15 V?
: Go to step8H4.
: Repair harness connector between battery, igni-
tion switch and ABSCM.
64
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

B4M0843A
8H4
CHECK GROUND CIRCUIT OF ABSCM.
1) Turn ignition switch to OFF.
2) Measure resistance between ABSCM connector and
chassis ground.
: Connector & terminal
(F49) No. 1—Chassis ground
Is resistance less than 0.5Ω?
: Go to step8H5.
: Repair ABSCM ground harness.
8H5CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN GENERATOR, BATTERY
AND ABSCM.
: Is there poor contact in connectors between
generator, battery and ABSCM?
: Repair connector.
: Go to step8H6.
8H6
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.
65
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code