SUBARU LEGACY 1997 Service Repair Manual

Diagnostic items
(select monitor FB0)CodeDisplay screen
(FB0)Diagnostic items (select monitor FB1) Display screen (FB1)Ref. to
4-4b
Abnormal stroke sen-
sor and stop light
switch54 PSS & BLSOpen/short circuits of stroke sensor B.SW HARD [T10Y1]
Comparison of stroke sensor and acceleration B.SW SOFT(G) [T10Y2]
Comparison of stroke sensor and stop light switch B.SW SOFT(B) [T10Y3]
Comparison of stroke sensor and pump B.SW SOFT(P) [T10Y4]
Open circuit of stop light switch B.SW SOFT(O) [T10Y5]
Abnormal fluid level
sensor line57 FLUID LEVEL SS Abnormal fluid level sensor line FLUID LEVEL SS [T10Z0]
Abnormal pressure
switch58 PRESSURE SW Abnormal pressure switch PRESSURE SW [T10AA0]
Abnormal TCS1 valve 61 TCS1 VALVE Abnormal TCS1 valve TCS1 VALVE [T10AB0]
Abnormal TCS2 valve 62 TCS2 VALVE Abnormal TCS2 valve TCS2 VALVE [T10AC0]
1. IF THE SELECT MONITOR IS USED FOR
TROUBLESHOOTING, IT IS ADVISED TO FOLLOW
THE PROCEDURE BELOW
1) Activate function FB0 to read the most recent trouble
code and record it.
2) Activate function FB1 to read all trouble codes and
record them.
(If troubles occur in the wheel speed sensor, stop & brake
switch, valve relay or motor system, detailed data on
troubles are displayed by the FB1 function, allowing you to
easily locate points where need repair.)
3) Perform troubleshooting mainly in the FB1 mode.
95
4-4bBRAKES
10. Diagnostic Chart with Select Monitor

B4M0490
C: TROUBLE CODE 11
—NO TROUBLE—
DIAGNOSIS:

ABS/TCS control module does not store troubles.
B4M0491
D: TROUBLE CODE 21
1. FR.SS OPEN
—Faulty front right ABS sensor (Open circuit)—
DIAGNOSIS:

Faulty ABS sensor

Faulty harness and connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS does not operate.

TCS does not operate.
1. Check resistance of ABS sensor.
<Ref. to 4-4b [T8B1].>
OK
Not OK
Replace ABS sensor.
2. Check harness connector between ABS/TCS
control module and ABS sensor.
<Ref. to 4-4b [T8B3].>
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.


96
4-4bBRAKES
10. Diagnostic Chart with Select Monitor

B4M0492
2. FR.SS SHORT
—Faulty front right ABS sensor (Short circuit)—
DIAGNOSIS:

Faulty ABS sensor

Faulty harness and connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.

TCS does not operate.
1. Check resistance of ABS sensor.
<Ref. to 4-4b [T8B1].>
OK
Not OK
Replace ABS sensor.
2. Check body short of ABS sensor.
<Ref. to 4-4b [T8B2].>
OK
Not OK
Replace ABS sensor.
3. Check body short of harness.
<Ref. to 4-4b [T8B4].>
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.



97
4-4bBRAKES
10. Diagnostic Chart with Select Monitor

B4M0493
E: TROUBLE CODE 22
1. FR.SS W.SPEED
—Irregular signals from front right ABS sensor—
DIAGNOSIS:

Faulty ABS sensor signal (noise, irregular signal, etc.)

Faulty harness/connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.
1. Check ABS sensor mechanical trouble.
<Ref. to 4-4b [T8C1].>
OK
Not OK
Repair ABS sensor/tone wheel.
2. Check ground circuit of ABS/TCS control
module.
<Ref. to 4-4b [T8C2].>
OK
Not OK
Repair harness/connector.
3. Check resistance of ABS sensor.
<Ref. to 4-4b [T8C3].>
OK
Not OK
Replace ABS sensor.
4. Check harness connector between ABS/TCS
control module and ABS sensor.
<Ref. to 4-4b [T8C4].>
OK
Not OK
Repair harness/connector.
5. Check sources of signal noise.
<Ref. to 4-4b [T8C5].>
OK
Not OK
Repair noise sources.
Replace ABS/TCS control module.





98
4-4bBRAKES
10. Diagnostic Chart with Select Monitor

B4M0494
2. FR.SS OR MV
—Irregular signals from front right ABS sensor in
decompressing mode—
DIAGNOSIS:

Faulty ABS sensor signal (noise, irregular signal, etc.)

Faulty hydraulic unit

Faulty harness/connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS does not operate.

TCS does not operate.
1. Check ABS sensor mechanical trouble.
<Ref. to 4-4b [T8C1].>
OK
Not OK
Repair ABS sensor/tone wheel.
2. Check ground circuit of ABS/TCS control
module.
<Ref. to 4-4b [T8C2].>
OK
Not OK
Repair harness/connector.
3. Check sources of signal noise.
<Ref. to 4-4b [T8C5].>
OK
Not OK
Repair noise sources.
4. Check operation of hydraulic unit.
<Ref. to 4-4b [T8C6].>
OK
Not OK
Replace hydraulic unit.
Replace ABS/TCS control module.




99
4-4bBRAKES
10. Diagnostic Chart with Select Monitor

B4M0495
3. FR.SS OVER
—Excessive speed of front right ABS sensor signal—
DIAGNOSIS:

Faulty ABS sensor signal (noise, irregular signal, etc.)

Faulty harness/connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.
1. Check ABS sensor mechanical trouble.
<Ref. to 4-4b [T8C1].>
OK
Not OK
Repair ABS sensor/tone wheel.
2. Check ground circuit of ABS/TCS control
module.
<Ref. to 4-4b [T8C2].>
OK
Not OK
Repair harness/connector.
3. Check sources of signal noise.
<Ref. to 4-4b [T8C5].>
OK
Not OK
Repair noise sources.
Replace ABS/TCS control module.



100
4-4bBRAKES
10. Diagnostic Chart with Select Monitor

B4M0496
F: TROUBLE CODE 23
1. FL.SS OPEN
—Faulty front left ABS sensor (Open circuit)—
DIAGNOSIS:

Faulty ABS sensor

Faulty harness and connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.
NOTE:
The procedures used are the same as those for FR.SS
OPEN.
<Ref. to 4-4b [T10D1].>
B4M0497
2. FL.SS SHORT
—Faulty front left ABS sensor (Short circuit)—
DIAGNOSIS:

Faulty ABS sensor

Faulty harness and connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.
NOTE:
The procedures used are the same as those for FR.SS
SHORT.
<Ref. to 4-4b [T10D2].>
101
4-4bBRAKES
10. Diagnostic Chart with Select Monitor

B4M0498
G: TROUBLE CODE 24
1. FL.SS W.SPEED
—Irregular signals from front left ABS sensor—
DIAGNOSIS:

Faulty ABS sensor signal (noise, irregular signal, etc.)

Faulty harness/connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.
NOTE:
The procedures used are the same as those for FR.SS
W.SPEED.
<Ref. to 4-4b [T10E1].>
B4M0499
2. FL.SS OR MV
—Irregular signals from front left ABS sensor in
decompressing mode—
DIAGNOSIS:

Faulty ABS sensor signal (noise, irregular signal, etc.)

Faulty hydraulic unit

Faulty harness/connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.
NOTE:
The procedures used are the same as those for FR.SS OR
MV.
<Ref. to 4-4b [T10E2].>
B4M0500
3. FL.SS OVER
—Excessive speed of front left ABS sensor signal—
DIAGNOSIS:

Faulty ABS sensor signal (noise, irregular signal, etc.)

Faulty harness/connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.
NOTE:
The procedures used are the same as those for FR.SS
OVER.
<Ref. to 4-4b [T10E3].>
102
4-4bBRAKES
10. Diagnostic Chart with Select Monitor

B4M0501
H: TROUBLE CODE 25
1. RR.SS OPEN
—Faulty rear right ABS sensor (Open circuit)—
DIAGNOSIS:

Faulty ABS sensor

Faulty harness and connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.
NOTE:
The procedures used are the same as those for FR.SS
OPEN.
<Ref. to 4-4b [T10D1].>
B4M0502
2. RR.SS SHORT
—Faulty rear right ABS sensor (Short circuit)—
DIAGNOSIS:

Faulty ABS sensor

Faulty harness and connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.
NOTE:
The procedures used are the same as those for FR.SS
SHORT.
<Ref. to 4-4b [T10D2].>
103
4-4bBRAKES
10. Diagnostic Chart with Select Monitor

B4M0503
I: TROUBLE CODE 26
1. RR.SS W.SPEED
—Irregular signals from rear right ABS sensor—
DIAGNOSIS:

Faulty ABS sensor signal (noise, irregular signal, etc.)

Faulty harness/connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.
NOTE:
The procedures used are the same as those for FR.SS
W.SPEED.
<Ref. to 4-4b [T10E1].>
B4M0504
2. RR.SS OR MV
—Irregular signals from rear right ABS sensor in
decompressing mode—
DIAGNOSIS:

Faulty ABS sensor signal (noise, irregular signal, etc.)

Faulty hydraulic unit

Faulty harness/connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.
NOTE:
The procedures used are the same as those for FR.SS OR
MV.
<Ref. to 4-4b [T10E2].>
B4M0505
3. RR.SS OVER
—Excessive speed of rear right ABS sensor signal—
DIAGNOSIS:

Faulty ABS sensor signal (noise, irregular signal, etc.)

Faulty harness/connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.
NOTE:
The procedures used are the same as those for FR.SS
OVER.
<Ref. to 4-4b [T10E3].>
104
4-4bBRAKES
10. Diagnostic Chart with Select Monitor