1997 SUBARU LEGACY ABS

B4M0802
AB: TROUBLE CODE 51 V. RELAY ON
—VALVE RELAY ON FAILURE—
DIAGNOSIS:

Faulty valve relay
TROUBLE SYMPTOM:

ABS does not operate.
WIRING DIAGRAM:
B4M1253
150
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor

B4M1272A
10AB1
CHECK VALVE RELAY IN ABSCM&H/U.
Measure resistance between ABSCM&H/U terminals.
Terminals
No. 23 (+)—No. 24 ():
: Is the resistance more than 1 MΩ?
: Go to step10AB2.
: Replace ABSCM&H/U.
10AB2CHECK POOR CONTACT IN CONNEC-
TORS.
: Is there poor contact in connectors between
generator, battery and ABSCM&H/U? to FOREWORD [T3C1].>
: Repair connector.
: Go to step10AB3.
10AB3
CHECK ABSCM&H/U.
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&H/U.
: Go to step10AB4.
10AB4CHECK ANY OTHER TROUBLE CODES
APPEARANCE.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
151
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor

B4M0969
AC: TROUBLE CODE 52 M. RELAY OPEN
—OPEN CIRCUIT OF MOTOR RELAY—
DIAGNOSIS:

Faulty motor

Faulty motor relay

Faulty harness connector
TROUBLE SYMPTOM:

ABS does not operate.
WIRING DIAGRAM:
B4M1255
152
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor

B4M1256A
10AC1CHECK INPUT VOLTAGE OF
ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM&H/U.
3) Turn ignition switch to ON.
4) Measure voltage between ABSCM&H/U connector and
chassis ground.
Connector & terminal
(F49) No. 25 (+)—Chassis ground ():
: Is the voltage between 10 V and 13 V?
: Go to step10AC2.
: Repair harness/connector between battery and
ABSCM&H/U and check fuse SBF6.
B4M1257A
10AC2
CHECK GROUND CIRCUIT OF MOTOR.
1) Turn ignition switch to OFF.
2) Measure resistance between ABSCM&H/U connector
and chassis ground.
Connector & terminal
(F49) No. 26—Chassis ground:
: Is the resistance less than 0.5Ω?
: Go to step10AC3.
: Repair ABSCM&H/U ground harness.
10AC3
CHECK MOTOR OPERATION.
Operate the check sequence.
NOTE:
Use the diagnosis connector to operate the sequence con-
trol.
: Can motor revolution noise (buzz) be heard
when carrying out the check sequence?
: Go to step10AC4.
: Replace ABSCM&H/U.
153
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor

10AC4CHECK POOR CONTACT IN CONNEC-
TORS.
Turn ignition switch to OFF.
: Is there poor contact in connector between
hydraclic unit, relay box and ABSCM&H/U?

: Repair connector.
: Go to step10AC5.
10AC5
CHECK ABSCM&H/U.
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&H/U.
: Go to step10AC6.
10AC6CHECK ANY OTHER TROUBLE CODES
APPEARANCE.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
154
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor

B4M0970
AD: TROUBLE CODE 52 M. RELAY ON
—MOTOR RELAY ON FAILURE—
DIAGNOSIS:

Faulty motor

Faulty motor relay

Faulty harness connector
TROUBLE SYMPTOM:

ABS does not operate.
WIRING DIAGRAM:
B4M1255
155
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor

B4M1270A
10AD1
CHECK MOTOR RELAY IN ABSCM&H/U.
Measure resistance between ABSCM&H/U terminals.
Terminals
No. 25—No. 26:
: Is the resistance more than 1 MΩ?
: Go to step10AD2.
: Replace ABSCM&H/U.
10AD2
CHECK MOTOR OPERATION.
Operate the sequence control.
: Can motor revolution noise (buzz) be heard
when carrying out the sequence control?
: Go to step10AD3.
: Replace ABSCM&H/U.
10AD3CHECK POOR CONTACT IN CONNEC-
TORS.
Turn ignition switch to OFF.
: Is there poor contact in connector between
hydraulic unit, relay box and ABSCM&H/U?

: Repair connector.
: Go to step10AD4.
10AD4
CHECK ABSCM&H/U.
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&H/U.
: Go to step10AD5.
10AD5CHECK ANY OTHER TROUBLE CODES
APPEARANCE.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
156
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor

B4M0971
AE: TROUBLE CODE 52 MOTOR
—ABNORMAL MOTOR—
DIAGNOSIS:

Faulty motor

Faulty motor relay

Faulty harness connector
TROUBLE SYMPTOM:

ABS does not operate.
WIRING DIAGRAM:
B4M1255
157
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor