1997 SUBARU LEGACY light

B4M0797A
7B5
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:
(F49) No. 55—Chassis ground:
Is resistance less than 0.5Ω?
: Go to step7B6.
: Repair ABSCM ground harness.
7B6
CHECK WIRING HARNESS.
1) Disconnect connector (F50) from relay box.
2) Turn ignition switch to ON.
: Does the ABS warning light remain off?
: Go to step7B7.
: Repair front wiring harness.
7B7
CHECK RELAY BOX.
1) Turn ignition switch to OFF.
2) Connect connector (F50) to relay box.
3) Remove valve relay from relay box.
4) Disconnect connector (ABS1) from hydraulic control
unit.
5) Turn ignition switch to ON.
: Does the ABS warning light remain off?
: Go to step7B8.
: Repair relay box and check fuse.
21
4-4cBRAKES [ABS 5.3 TYPE]
7. Diagnostics Chart for ABS Warning Light Circuit and Diagnosis Circuit Failure

B4M0798A
B4M0811A
7B8
CHECK VALVE RELAY.
1) Measure resistance between valve relay terminal and
terminal.
: Terminals
No. 30—No. 87:
Is resistance more than 1 MΩ?
No. 30—No. 87a:
Is resistance less than 0.5Ω?
: Go to next step.
: Replace valve relay.
2) Connect battery to valve relay terminal No. 85 and No.
86.
3) Measure resistance between valve relay terminals.
: Terminals
No. 30—No. 87:
Is resistance less than 0.5Ω?
No. 30—No. 87a:
Is resistance more than 1 MΩ?
: Go to step7B9.
: Replace valve relay.
7B9
CHECK HYDRAULIC CONTROL UNIT.
1) Turn ignition switch to OFF.
2) Connect connector (ABS1) to hydraulic control unit.
3) Turn ignition switch to ON.
: Is the ABS warning light off?
: Go to step7B10.
: Replace hydraulic control unit and check fuse No.
19.
22
4-4cBRAKES [ABS 5.3 TYPE]
7. Diagnostics Chart for ABS Warning Light Circuit and Diagnosis Circuit Failure

B4M0800A
7B10
CHECK DIAGNOSIS TERMINAL.
Measure resistance between diagnosis terminals (B81)
and chassis ground.
: Terminals
Diagnosis terminal (A)—Chassis ground:
Diagnosis terminal (B)—Chassis ground:
Is the resistance less than 1Ω?
: Go to step7B11.
: Repair diagnosis terminal harness.
B4M0801A
7B11
CHECK DIAGNOSIS LINE.
1) Turn ignition switch to OFF.
2) Connect diagnosis terminal to diagnosis connector
(B82) No. 6.
3) Disconnect connector from ABSCM.
4) Measure resistance between ABSCM connector and
chassis ground.
: Connector & terminal
(F49) No. 13—Chassis ground:
Is the resistance less than 1Ω?
: Go to step7B12.
: Repair harness connector between ABSCM and
diagnosis connector.
7B12CHECK POOR CONTACT IN ABSCM
CONNECTOR.
: Is there poor contact in ABSCM connector?
: Repair connector.
: Replace ABSCM.
23
4-4cBRAKES [ABS 5.3 TYPE]
7. Diagnostics Chart for ABS Warning Light Circuit and Diagnosis Circuit Failure

C: TROUBLE CODE DOES NOT APPEAR.
DIAGNOSIS:

Diagnosis circuit is open.
TROUBLE SYMPTOM:

The ABS warning light turns on or off normally but the
start code cannot be read out in the diagnostic mode.
7C1.Check diagnosis terminal.
7C2.Check diagnosis line.
7C3.Check poor contact in ABSCM connector.


24
4-4cBRAKES [ABS 5.3 TYPE]
7. Diagnostics Chart for ABS Warning Light Circuit and Diagnosis Circuit Failure

WIRING DIAGRAM:
B4M1034
B4M0800A
7C1
CHECK DIAGNOSIS TERMINAL.
Measure resistance between diagnosis terminals (B81)
and chassis ground.
: Terminals
Diagnosis terminal (A)—Chassis ground:
Diagnosis terminal (B)—Chassis ground:
Is the resistance less than 0.5Ω?
: Go to step7C2.
: Repair diagnosis terminal harness.
25
4-4cBRAKES [ABS 5.3 TYPE]
7. Diagnostics Chart for ABS Warning Light Circuit and Diagnosis Circuit Failure

B4M0801A
7C2
CHECK DIAGNOSIS LINE.
1) Turn ignition switch to OFF.
2) Connect diagnosis terminal to diagnosis connector
(B82) No. 6.
3) Disconnect connector from ABSCM.
4) Measure resistance between ABSCM connector and
chassis ground.
: Connector & terminal
(F49) No. 13—Chassis ground:
Is the resistance less than 0.5Ω?
: Go to step7C3.
: Repair harness connector between ABSCM and
diagnosis connector.
7C3CHECK POOR CONTACT IN ABSCM
CONNECTOR.
: Is there poor contact in ABSCM connector?
: Repair connector.
: Replace ABSCM.
26
4-4cBRAKES [ABS 5.3 TYPE]
7. Diagnostics Chart for ABS Warning Light Circuit and Diagnosis Circuit Failure

8. Diagnostics Chart with Trouble Code
A: LIST OF TROUBLE CODE
Trouble code Contents of diagnosis Ref. to
11Start code

Trouble code is shown after start code.

Only start code is shown in normal condition.—
21
Abnormal ABS sensor
(Open circuit or input voltage too high)Front right ABS sensor
4-4c [T8B0] 23 Front left ABS sensor
25 Rear right ABS sensor
27 Rear left ABS sensor
22
Abnormal ABS sensor
(Abnormal ABS sensor signal)Front right ABS sensor
4-4c [T8C0] 24 Front left ABS sensor
26 Rear right ABS sensor
28 Rear left ABS sensor
29 Any one of four 4-4c [T8D0]
31
Abnormal solenoid valve circuit(s) in
hydraulic unitFront right inlet valve 4-4c [T8E0]
32 Front right outlet valve 4-4c [T8F0]
33 Front left inlet valve 4-4c [T8E0]
34 Front left outlet valve 4-4c [T8F0]
35 Rear right inlet valve 4-4c [T8E0]
36 Rear right outlet valve 4-4c [T8F0]
37 Rear left inlet valve 4-4c [T8E0]
38 Rear left outlet valve 4-4c [T8F0]
41 Abnormal ABS control module 4-4c [T8G0]
42 Source voltage is low. 4-4c [T8H0]
44 A combination of AT control abnormals 4-4c [T8I0]
46 Abnormal G sensor power supply voltage 4-4c [T8J0]
51 Abnormal valve relay4-4c [T8K0]
52 Abnormal motor and/or motor relay 4-4c [T8L0]
54 Abnormal stop light switch 4-4c [T8M0]
56 Abnormal G sensor output voltage 4-4c [T8N0]
27
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

M: TROUBLE CODE 54
—ABNORMAL STOP LIGHT SWITCH—
DIAGNOSIS:

Faulty stop light switch
TROUBLE SYMPTOM:

ABS does not operate.
8M1.Check if stop lights come on.
8M2.Check open circuit of harness.
8M3.Check poor contact in connector between
stop light switch and ABSCM.
8M4.Check ABSCM.



102
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code