1996 SUBARU LEGACY Chassis

B4M0809A
10H7CHECK HARNESS CONNECTOR
BETWEEN ABSCM AND ABS SENSOR.
1) Connect connector to ABS sensor.
2) Measure resistance between ABSCM connector termi-
nals.
: Trouble code/Connector & terminal
21/(F49) No. 14—No. 15
23/(F49) No. 49—No. 19
25/(F49) No. 18—No. 46
27/(F49) No. 16—No. 17
Is resistance 0.8—1.2 kΩ?
: Go to step10H8.
: Repair harness connector between ABSCM and
ABS sensor.
B4M0810A
10H8
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
21/(F49) No. 14—Chassis ground
23/(F49) No. 49—Chassis ground
25/(F49) No. 18—Chassis ground
27/(F49) No. 16—Chassis ground
Is voltage 0 V?
: Go to next step.
: Repair harness between ABSCM and ABS sen-
sor.
3) Turn ignition switch to OFF.
4) Measure voltage between ABSCM connector and chas-
sis ground.
: Trouble code/Connector & terminal
21/(F49) No. 14—Chassis ground
23/(F49) No. 49—Chassis ground
25/(F49) No. 18—Chassis ground
27/(F49) No. 16—Chassis ground
Is voltage 0 V?
: Go to step10H9.
: Repair harness between ABSCM and ABS sen-
sor.
139
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M1038A
10L4
CHECK SHIELD CIRCUIT.
1) Connect all connectors.
2) Measure resistance between shield connector and
chassis ground.
: Trouble code/Connector & terminal
22/(B100) No. 11—Chassis ground
24/(B100) No. 2—Chassis ground
26/(P1) No. 8—Chassis ground
28/(P1) No. 3—Chassis ground
Is resistance less than 0.5Ω?
: Go to step10L5.
: Repair shield harness.
10L5
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 noise interference.
146
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0818B
B4M1042A
10L8CHECK GROUND SHORT OF ABS SEN-
SOR.
Measure resistance between ABS sensor and chassis
ground.
: Trouble code/Connector & terminal
22/to (B6) No. 1—Chassis ground
24/to (B15) No. 1—Chassis ground
26/to (P8) No. 1—Chassis ground
28/to (P9) No. 1—Chassis ground
Is resistance more than 1 MΩ?
: Go to step10L9.
: Replace ABS sensor.
B4M0809A
10L9CHECK HARNESS CONNECTOR
BETWEEN ABSCM AND ABS SENSOR.
1) Connect connector to ABS sensor.
2) Disconnect connector from ABSCM.
3) Measure resistance at ABSCM connector terminals.
: Trouble code/Connector & terminal
22/(F49) No. 14—No. 15
24/(F49) No. 49—No. 69
26/(F49) No. 18—No. 46
28/(F49) No. 16—No. 17
Is resistance 0.8—1.2 kΩ?
: Go to step10L10.
: Repair harness connector between ABSCM and
ABS sensor.
149
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0820A
10L10
CHECK GROUND SHORT OF HARNESS.
Measure resistance between ABSCM connector and chas-
sis ground.
: Trouble code/Connector & terminal
22/(F49) No. 14—Chassis ground
24/(F49) No. 49—Chassis ground
26/(F49) No. 18—Chassis ground
28/(F49) No. 16—Chassis ground
Is resistance more than 1 MΩ?
: Go to step10L11.
: Repair harness connector between ABSCM and
ABS sensor.
B4M0814A
10L11
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—GND
(F49) No. 55—GND
Is resistance less than 0.5Ω?
: Go to step10L12.
: Repair ABSCM ground harness.
10L12CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN ABSCM AND ABS SEN-
SOR.
: Is there poor contact in connectors between
ABSCM and ABS sensor?
: Repair connector.
: Go to step10L13.
150
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

10L13
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 step10L14.
B4M1038A
10L14
CHECK SHIELD CIRCUIT.
1) Connect all connectors.
2) Measure resistance between shield connector and
chassis ground.
: Trouble code/Connector & terminal
22/(B100) No. 11—Chassis ground
24/(B100) No. 2—Chassis ground
26/(P1) No. 8—Chassis ground
28/(P1) No. 3—Chassis ground
Is resistance less than 0.5Ω?
: Go to step10L15.
: Repair shield harness.
151
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0825B
10Q4CHECK GROUND SHORT OF SOLENOID
VA LV E .
Measure resistance 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 resistance more than 1 MΩ?
: Go to step10Q5.
: Replace hydraulic unit.
B4M0828A
10Q5
CHECK GROUND SHORT OF HARNESS.
1) Disconnect connector from ABSCM.
2) Measure resistance between ABSCM connector and
chassis 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 step10Q6.
: Repair harness between ABSCM and hydraulic
unit.
163
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0826B
10Q9CHECK BATTERY SHORT OF SOLENOID
VA LV E .
1) Turn ignition switch to OFF.
2) Disconnect two connectors (ABS1, F9) from hydraulic
unit.
3) Disconnect connector from ABSCM.
4) Turn ignition switch to ON.
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 next step.
: Replace hydraulic unit.
6) Turn ignition switch to OFF.
7) 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 step10Q10.
: Replace hydraulic unit.
B4M0827A
10Q10
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.
3) Turn ignition switch to OFF.
4) Measure voltage between ABSCM connector and chas-
sis ground.
165
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

: 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?
: Replace ABSCM.
: Repair harness between ABSCM and hydraulic
unit.
B4M0824B
10Q11CHECK 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 step10Q12.
: Replace hydraulic unit.
B4M0825B
10Q12CHECK GROUND SHORT OF SOLENOID
VA LV E .
Measure resistance 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 resistance more than 1 MΩ?
: Go to step10Q13.
: Replace hydraulic unit.
166
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor