1996 SUBARU LEGACY brake

B4M0720A
1. CHECK TCS OFF SWITCH.
1) Turn ignition switch OFF.
2) Disconnect connector from TCS OFF switch.
3) Measure resistance between TCS OFF switch termi-
nals.
Connector & terminal / Specified resistance:
(i9) No. 5—No.3/1Ωor less
(When the switch is pressed,
turns ON.)
/1MΩor less
(When the switch is released,
turns OFF.)
B4M0401A
2. CHECK HARNESS CONNECTOR BETWEEN ABS/
TCS CONTROL MODULE AND TCS OFF SWITCH.
1) Turn ignition switch OFF.
2) Disconnect connector to TCS OFF switch.
3) Disconnect connector from ABS/TCS control module.
4) Measure resistance between ABS/TCS control module
connector terminals.
Connector & terminal / Specified resistance:
(P7) No. 16—body / 1Ωor less (When the switch
is pressed, turns ON.)
/1MΩor more (When the
switch is released, turns OFF.)
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7. Diagnostics Chart for Warning Light Circuit Failure

H: ABS WARNING, TCS WARNING, TCS
OPERATING INDICATOR AND/OR TCS OFF
INDICATOR LIGHTS DO NOT COME ON.
—TROUBLE IN WARNING LIGHT DRIVE
CIRCUIT—
DIAGNOSIS:

Faulty ABS warning light

Faulty TCS warning light

Faulty TCS OFF light

Faulty TCS operating indicator light

Faulty harness connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

Warning light does not illuminate.

Impossible to read trouble code.
Check warning light bulb.
OK
Not OK
Repair warning light bulb.
1. Check warning light power supply.
OK
Not OK
Repair ABS warning light power line.
2. Check input voltage of ABS/TCS control mod-
ule.
OK
Not OK
Repair harness/connector.
3. Check ground line of ABS/TCS control mod-
ule.
OK
Not OK
Repair ground line.
Replace ABS/TCS control module.




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7. Diagnostics Chart for Warning Light Circuit Failure

B4M0402
B4M0403A
1. CHECK WARNING LIGHT POWER SUPPLY.
1) Turn ignition switch OFF.
2) Disconnect combination meter.
3) Turn ignition switch ON.
4) Measure voltage between combination meter connector
and body.
Connector & terminal / Specified voltage:
(i14) No. 11—body / 10—13 V
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7. Diagnostics Chart for Warning Light Circuit Failure

B4M0404A
2. CHECK INPUT VOLTAGE OF ABS/TCS CONTROL
MODULE.
1) Turn ignition switch OFF and connect combination
meter connector.
2) Disconnect all connectors from ABS/TCS control mod-
ule.
3) Remove ABS/TCS valve relay.
4) Turn ignition switch ON.
5) Measure voltage between ABS/TCS control module and
body.
Connector & terminal / Specified voltage:
ABS warning:
(P6) No. 2—body / 10—13 V
TCS warning:
(P6) No. 3—body / 10—13 V
TCS operation:
(P6) No. 11—body / 10—13 V
TCS OFF:
(P6) No. 10—body / 10—13 V
B4M0405A
3. CHECK GROUND LINE OF ABS/TCS CONTROL
MODULE.
Measure resistance between ABS/TCS control module and
body.
Connector & terminal / Specified resistance:
(P4) No. 6—body / 1Ωor less
(P5) No. 5—body / 1Ωor less
(P7) No. 15—body / 1Ωor less
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7. Diagnostics Chart for Warning Light Circuit Failure

8. Diagnostics Chart with Trouble Code
A: LIST OF TROUBLE CODE
Trouble code Contents of diagnosis Ref. to 4-4b
11Start code

Trouble code is shown after start code.

Only start code is shown in normal condition.—
21
Faulty ABS sensor
(Open circuit or short circuit)Front right wheel speed sensor
[T8B0] 23 Front left wheel speed sensor
25 Rear right wheel speed sensor
27 Rear left wheel speed sensor
22
Faulty ABS sensor
(Faulty ABS sensor signal)Front right wheel speed sensor
[T8C0] 24 Front left wheel speed sensor
26 Rear right wheel speed sensor
28 Rear left wheel speed sensor
31
Faulty solenoid valve circuit(s) in hydraulic
unitFront right inlet valve [T8D0]
32 Front right outlet valve [T8E0]
33 Front left inlet valve [T8D0]
34 Front left outlet valve [T8E0]
35 Rear right inlet valve [T8D0]
36 Rear right outlet valve [T8E0]
37 Rear left inlet valve [T8D0]
38 Rear left outlet valve [T8E0]
41 Faulty ABS/TCS control module [T8F0]
42 Source voltage is high.[T8G0]
43 Faulty engine control module communication cables [T8H0]
51 Faulty valve relay[T8I0]
52 Faulty motor, motor sensor and/or motor relay [T8J0]
54 Faulty stroke sensor and/or stop light switch [T8K0]
57 Faulty fluid level sensor[T8L0]
58 Faulty pressure switch[T8M0]
61
Faulty solenoid valve circuit(s) in hydraulic
unitTCS 1 valve [T8D0]
62 TCS 2 valve [T8D0]
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8. Diagnostics Chart with Trouble Code

B: TROUBLE CODE 21, 23, 25 AND 27
—FAULTY ABS SENSOR (OPEN CIRCUIT OR
SHORT CIRCUIT)—
DIAGNOSIS:

Faulty ABS sensor

Faulty harness/connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS does not operate.

TCS does not operate.
1. Check resistance of ABS sensor.
OK
Not OK
Replace ABS sensor.
2. Check body short of ABS sensor.
OK
Not OK
Replace ABS sensor.
3. Check harness connector between ABS/TCS
control module and ABS sensor.
OK
Not OK
Repair harness/connector.
4. Check body short of harness.
OK
Not OK
Repair harness/connector.
Replace ABS/TCS control module.
NOTE:
When checking ABS sensor, carefully bend or swing con-
nector and harness to check for improper contacts or open
circuits.




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8. Diagnostics Chart with Trouble Code

B4M0406
B4M0407A
1. CHECK RESISTANCE OF ABS SENSOR.
1) Turn ignition switch OFF.
2) Disconnect connector from ABS sensor.
3) Measure resistance between ABS sensor connector ter-
minals.
TROUBLE CODE / Connector & terminal:
21 / (B6) No. 1—No. 2
23 / (B15) No. 1—No. 2
25 / (P8) No. 1—No. 2
27 / (P9) No. 1—No. 2
Specified resistance: 0.8—1.2 kΩ
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8. Diagnostics Chart with Trouble Code

B4M0408A
2. CHECK BODY SHORT OF ABS SENSOR.
1) Turn ignition switch OFF.
2) Disconnect connector from ABS sensor.
3) Measure resistance between ABS sensor connector ter-
minal and body.
TROUBLE CODE / Connector & terminal:
21 / (B6) No. 1—body
/ (B6) No. 2—body
23 / (B15) No. 1—body
/ (B15) No. 2—body
25 / (P8) No. 1—body
/ (P8) No. 2—body
27 / (P9) No. 1—body
/ (P9) No. 2—body
Specified resistance: 1 MΩor more
B4M0409A
3. CHECK HARNESS CONNECTOR BETWEEN ABS/
TCS CONTROL MODULE AND ABS SENSOR.
1) Turn ignition switch OFF.
2) Connect connector to ABS sensor.
3) Disconnect all connectors from ABS/TCS control mod-
ule.
4) Measure resistance between ABS/TCS control module
connector terminals.
TROUBLE CODE / Connector & terminal:
21 / (P6) No. 8—No. 16
23 / (P7) No. 1—No. 11
25 / (P7) No. 2—No. 12
27 / (P6) No. 7—No. 15
Specified resistance: 0.8—1.2 kΩ
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8. Diagnostics Chart with Trouble Code