SUBARU LEGACY 1997 Service Repair Manual

B4M0506
J: TROUBLE CODE 27
1. RL.SS OPEN
—Faulty rear 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.

B4M0507
2. RL.SS SHORT
—Faulty rear 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.

105
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10. Diagnostic Chart with Select Monitor

B4M0508
K: TROUBLE CODE 28
1. RL.SS W.SPEED
—Irregular signals from rear 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.

B4M0509
2. RL.SS OR MV
—Irregular signals from rear 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.

B4M0510
3. RL.SS OVER
—Excessive speed of rear 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.

106
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10. Diagnostic Chart with Select Monitor

B4M0511
L: TROUBLE CODE 31
FR.IN VALVE
—Faulty front right inlet solenoid valve—
DIAGNOSIS:

Faulty harness/connector

Faulty solenoid valve in hydraulic unit

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.

ABS sequence control does not operate.

TCS sequence control does not operate.

Air bleeding mode does not operate.
1. Check resistance of solenoid valve.

OK
Not OK
Replace hydraulic unit.
2. Check body short of solenoid valve.

OK
Not OK
Replace hydraulic unit.
3. Check body short of harness.

OK
Not OK
Repair harness.
4. Check harness between ABS/TCS control
module and hydraulic unit.

OK
Not OK
Repair harness/connector.
Replace ABS/TCS control module.




107
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10. Diagnostic Chart with Select Monitor

B4M0512
M: TROUBLE CODE 32
FR.OUT VALVE
—Faulty front right outlet solenoid valve—
DIAGNOSIS:

Faulty harness/connector

Faulty solenoid valve in hydraulic unit

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.

ABS sequence control does not operate.

TCS sequence control does not operate.

Air bleeding mode does not operate.
1. Check resistance of solenoid valve.

OK
Not OK
Replace hydraulic unit.
2. Check body short of solenoid valve.

OK
Not OK
Replace hydraulic unit.
3. Check body short of harness.

OK
Not OK
Repair harness.
4. Check harness between ABS/TCS control
module and hydraulic unit.

OK
Not OK
Repair harness/connector.
Replace ABS/TCS control module.
B4M0513
N: TROUBLE CODE 33
FL.IN VALVE
—Faulty front left inlet solenoid valve—
DIAGNOSIS:

Faulty harness/connector

Faulty solenoid valve in hydraulic unit

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.

ABS sequence control does not operate.

TCS sequence control does not operate.

Air bleeding mode does not operate.
NOTE:
The procedures used are the same as those for FR.IN
VA LV E .





108
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10. Diagnostic Chart with Select Monitor

B4M0514
O: TROUBLE CODE 34
FL.OUT VALVE
—Faulty front left outlet solenoid valve—
DIAGNOSIS:

Faulty harness/connector

Faulty solenoid valve in hydraulic unit

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.

ABS sequence control does not operate.

TCS sequence control does not operate.

Air bleeding mode does not operate.
NOTE:
The procedures used are the same as those for FR.OUT
VA LV E .

B4M0515
P: TROUBLE CODE 35
RR.IN VALVE
—Faulty rear right inlet solenoid valve—
DIAGNOSIS:

Faulty harness/connector

Faulty solenoid valve in hydraulic unit

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.

ABS sequence control does not operate.

TCS sequence control does not operate.

Air bleeding mode does not operate.
NOTE:
The procedures used are the same as those for FR.IN
VA LV E .

109
4-4bBRAKES
10. Diagnostic Chart with Select Monitor

B4M0516
Q: TROUBLE CODE 36
RR.OUT VALVE
—Faulty rear right outlet solenoid valve—
DIAGNOSIS:

Faulty harness/connector

Faulty solenoid valve in hydraulic unit

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.

ABS sequence control does not operate.

TCS sequence control does not operate.

Air bleeding mode does not operate.
NOTE:
The procedures used are the same as those for FR.OUT
VA LV E .

B4M0517
R: TROUBLE CODE 37
RL.IN VALVE
—Faulty rear left inlet solenoid valve—
DIAGNOSIS:

Faulty harness/connector

Faulty solenoid valve in hydraulic unit

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.

ABS sequence control does not operate.

TCS sequence control does not operate.

Air bleeding mode does not operate.
NOTE:
The procedures used are the same as those for FR.IN
VA LV E .

11 0
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10. Diagnostic Chart with Select Monitor

B4M0518
S: TROUBLE CODE 38
RL.OUT VALVE
—Faulty rear left outlet solenoid valve—
DIAGNOSIS:

Faulty harness/connector

Faulty solenoid valve in hydraulic unit

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS and TCS do not operate.

ABS sequence control does not operate.

TCS sequence control does not operate.

Air bleeding mode does not operate.
NOTE:
The procedures used are the same as those for FR.OUT
VA LV E .

B4M0519
T: TROUBLE CODE 41
ECU
—Faulty ABS/TCS control module—
DIAGNOSIS:

Faulty ABS/TCS control module

Faulty harness/connector
TROUBLE SYMPTOM:

ABS does not operate.

TCS does not operate.
1. Check ground circuit of ABS/TCS control
module.

OK
Not OK
Repair harness/connector.
2. Check harness connectors between power
supply generator, battery and ABS/TCS con-
trol module.

OK
Not OK
Repair harness/connector.
3. Check sources of signal noise.

OK
Not OK
Repair noise sources.
Replace ABS/TCS control module.



111
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10. Diagnostic Chart with Select Monitor

B4M0520
U: TROUBLE CODE 42
HIGH VOLTAGE
—Source voltage is high—
DIAGNOSIS:

Power source voltage of the ABS/TCS control module is
more than 18 V.

Faulty ABS/TCS control module

Faulty harness/connector
TROUBLE SYMPTOM:

ABS does not operate.

TCS does not operate.
1. Check generator.

OK
Not OK
Repair generator.
2. Check battery terminal.

OK
Not OK
Repair battery terminal.
3. Check input voltage of ABS/TCS control mod-
ule.

OK
Not OK
Repair harness/connector.
4. Check ground circuit of ABS/TCS control
module.

OK
Not OK
Repair harness/connector.
Replace ABS/TCS control module.




11 2
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10. Diagnostic Chart with Select Monitor

B4M0521
V: TROUBLE CODE 43
EGI LINE
—Faulty engine control module communication
cables—
DIAGNOSIS:

AET communication cable is broken or short circuited.

AEB communication cable is broken or short circuited.

AEC communication cable is broken or short circuited.

Faulty ABS/TCS control module

Faulty engine control module
TROUBLE SYMPTOM:

TCS does not operate.
1. Check communication cables.

OK

Terminal voltage
remains at 4—5.4 V.
Replace ABS/TCS control module.

Terminal voltage
remains at 10—14 V.
Go to step 2.

Terminal voltage
remains at2Vorless.
Go to step 4.
Replace ABS/TCS control module.
2. Check harness between ABS/TCS control
module and ECM.

OK
Not OK
Repair harness.
3. Check ABS/TCS control module internal
circuits.

OK
Not OK
Replace ABS/TCS control module.
Replace engine control module.
4. Check output voltage of ECM.

Not OK
OK
6. Check open circuit of harness.
OK Not OK
Replace ABS/TCS
control module.
5. Check body short of harness.

OK
Not OK
Repair harness/connector.
Replace engine control module.






11 3
4-4bBRAKES
10. Diagnostic Chart with Select Monitor

B4M0522
W: TROUBLE CODE 51
1. V.RELAY ON
—Valve relay ON malfunction—
DIAGNOSIS:

Faulty valve relay

Faulty harness/connector

Faulty ABS/TCS control module
TROUBLE SYMPTOM:

ABS does not operate.

TCS does not operate.
1. Check contact point of valve relay.

OK
Not OK
Replace valve relay.
2. Check short circuit of valve relay.

OK
Not OK
Replace valve relay.
3. Check ground circuit of valve relay.

OK
Not OK
Repair harness/connector.
4. Check body short of harness.

OK
Not OK
Repair harness.
Replace ABS/TCS control module.




11 4
4-4bBRAKES
10. Diagnostic Chart with Select Monitor