1997 SUBARU LEGACY battery

B4M1254A
8V1CHECK INPUT VOLTAGE OF
ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM&H/U.
3) Run the engine at idle.
4) Measure voltage between ABSCM&H/U connector and
chassis ground.
Connector & terminal
(F49) No. 1 (+)—Chassis ground ():
(F49) No. 24 (+)—Chassis ground ():
: Is the voltage between 10 V and 15 V?
: Go to step8V2.
: Repair harness connector between battery and
ABSCM&H/U.
B4M1243A
8V2CHECK GROUND CIRCUIT OF
ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Measure resistance between ABSCM&H/U connector
and chassis ground.
Connector & terminal
(F49) No. 23—Chassis ground:
: Is the resistance less than 0.5Ω?
: Go to step8V3.
: Repair ABSCM&H/U ground harness.
B4M1272A
8V3
CHECK VALVE RELAY IN ABSCM&H/U.
Measure resistance between ABSCM&H/U and terminals.
Terminals
No. 23 (+)—No. 24 ():
: Is the resistance more than 1 MΩ?
: Go to step8V4.
: Replace ABSCM&H/U.
64
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light

8V4CHECK 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 step8V5.
8V5
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 step8V6.
8V6CHECK ANY OTHER TROUBLE CODES
APPEARANCE.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
65
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light

B4M1256A
8W1CHECK 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 15 V?
: Go to step8W2.
: Repair harness/connector between battery and
ABSCM&H/U and check fuse SBF6.
B4M1257A
8W2
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 step8W3.
: Repair ABSCM&H/U ground harness.
67
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light

B4M1234A
8W3CHECK INPUT VOLTAGE OF
ABSCM&H/U.
1) Run the engine at idle.
2) Measure voltage between ABSCM&H/U connector and
chassis ground.
Connector & terminal
(F49) No. 1 (+)—Chassis ground ():
: Is the voltage between 10 V and 15 V?
: Go to step8W4.
: Repair harness connector between battery, igni-
tion switch and ABSCM&H/U.
B4M1243A
8W4CHECK GROUND CIRCUIT OF
ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Measure resistance between ABSCM&H/U connector
and chassis ground.
Connector & terminal
(F49) No. 23—Chassis ground:
: Is the resistance less than 0.5Ω?
: Go to step8W5.
: Repair ABSCM&H/U ground harness.
8W5
CHECK MOTOR OPERATION.
Operate the sequence control.
NOTE:
Use the diagnosis connector to operate the sequence con-
trol.
: Can motor revolution noise (buzz) be heard
when carrying out the sequence control?
: Go to step8W6.
: Replace ABSCM&H/U.
68
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light

8W6CHECK POOR CONTACT IN CONNEC-
TORS.
Turn ignition switch to OFF.
: Is there poor contact in connector between
generator, battery and ABSCM&H/U? to FOREWORD [T3C1].>
: Repair connector.
: Go to step8W7.
8W7
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 step8W8.
8W8CHECK ANY OTHER TROUBLE CODES
APPEARANCE.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
69
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light

B4M1261A
8Y4CHECK OPEN CIRCUIT IN G SENSOR
OUTPUT HARNESS AND GROUND HAR-
NESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM&H/U.
3) Measure resistance between ABSCM&H/U connector
terminals.
Connector & terminal
(F49) No. 30—No. 28:
: Is the resistance between 4.3 and 4.9 kΩ?
: Go to step8Y5.
: Repair harness/connector between G sensor and
ABSCM&H/U.
B4M1262A
8Y5CHECK GROUND SHORT IN G SENSOR
OUTPUT HARNESS.
1) Disconnect connector from G sensor.
2) Measure resistance between ABSCM&H/U connector
and chassis ground.
Connector & terminal
(F49) No. 6—Chassis ground:
: Is the resistance more than 1 MΩ?
: Go to step8Y6.
: Repair harness between G sensor and
ABSCM&H/U.
B4M1263A
8Y6
CHECK BATTERY SHORT OF HARNESS.
Measure voltage between ABSCM&H/U connector and
chassis ground.
Connector & terminal
(F49) No. 6 (+)—Chassis ground ():
: Is the voltage less than 1 V?
: Go to step8Y7.
: Repair harness between G sensor and
ABSCM&H/U.
74
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light

B4M1263A
8Y7
CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between ABSCM&H/U connector and
chassis ground.
Connector & terminal
(F49) No. 6 (+)—Chassis ground ():
: Is the voltage less than 1 V?
: Go to step8Y8.
: Repair harness between G sensor and
ABSCM&H/U.
B4M1264A
8Y8
CHECK GROUND SHORT OF HARNESS.
Measure resistance between ABSCM&H/U connector and
chassis ground.
Connector & terminal
(F49) No. 28—Chassis ground:
: Is the resistance more than 1 MΩ?
: Go to step8Y9.
: Repair harness between G sensor and
ABSCM&H/U.
Replace ABSCM&H/U.
75
4-4dBRAKES [ABS 5.3i TYPE]
8. Diagnostics Chart with Trouble Code by ABS Warning Light

B: LIST OF TROUBLE CODE
Code Display screen (FB1) Contents of diagnosis Ref. to
—ERROR 3 (1) Select monitor communication failure 4-4d [T10C0]
11 NO TROUBLEAlthough no trouble appears on the select monitor display, the ABS
warning light remains on.4-4d [T10D0]
21 FR. SS HARD Open circuit or input voltage too high of FR sensor 4-4d [T10E0]
22 FR. SS SOFT Abnormal ABS sensor signal of FR sensor 4-4d [T10I0]
23 FL. SS HARD Open circuit or input voltage too high of FL sensor 4-4d [T10F0]
24 FL. SS SOFT Abnormal ABS sensor signal of FL sensor 4-4d [T10J0]
25 RR. SS HARD Open circuit or input voltage too high of RR sensor 4-4d [T10G0]
26 RR. SS SOFT Abnormal ABS sensor signal of RR sensor 4-4d [T10K0]
27 RL. SS HARD Open circuit or input voltage too high of RL sensor 4-4d [T10H0]
28 RL. SS SOFT Abnormal ABS sensor signal of RL sensor 4-4d [T10L0]
29 EITHER. SS SOFT Abnormal ABS sensor signal (any one of four) 4-4d [T10M0]
31 FR. EV VALVE Abnormal FR inlet valve 4-4d [T10N0]
32 FR. AV VALVE Abnormal FR outlet valve 4-4d [T10R0]
33 FL. EV VALVE Abnormal FL inlet valve 4-4d [T10O0]
34 FL. AV VALVE Abnormal FL outlet valve 4-4d [T10S0]
35 RR. EV VALVE Abnormal RR inlet valve 4-4d [T10P0]
36 RR. AV VALVE Abnormal RR outlet valve 4-4d [T10T0]
37 RL. EV VALVE Abnormal RL inlet valve 4-4d [T10Q0]
38 RL. AV VALVE Abnormal RL outlet valve 4-4d [T10U0]
41 ECU Abnormal ABSCM&H/U 4-4d [T10V0]
42LOW VOLTAGE Source voltage is low. 4-4d [T10W0]
HIGH VOLTAGE Source voltage is high. 4-4d [T10X0]
44CCM LINE A combination of AT control abnormals (ABS not in control) 4-4d [T10Y0]
CCM OPEN A combination of AT control abnormals (ABS in control) 4-4d [T10Z0]
51V. RELAY Abnormal valve relay 4-4d [T10AA0]
V. RELAY ON Valve relay ON failure 4-4d [T10AB0]
52M. RELAY OPEN Open circuit of motor relay 4-4d [T10AC0]
M. RELAY ON Motor relay ON failure 4-4d [T10AD0]
MOTOR Abnormal motor 4-4d [T10AE0]
54 BLS Abnormal stop light switch 4-4d [T10AF0]
56G SENSOR LINE Open or short circuit of G sensor 4-4d [T10AG0]
G SENSOR +B Battery short of G sensor 4-4d [T10AH0]
G SENSOR H µ Abnormal G sensor high µ output 4-4d [T10AI0]
G SENSOR STICK G sensor output is stuck. 4-4d [T10AJ0]
NOTE:
High µ means high friction coefficient against road sur-
face.
91
4-4dBRAKES [ABS 5.3i TYPE]
10. Diagnostics Chart with Select Monitor