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.
<Ref. to 4-4b [T10D1].>
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.
<Ref. to 4-4b [T10D2].>
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.
<Ref. to 4-4b [T10E1].>
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.
<Ref. to 4-4b [T10E2].>
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.
<Ref. to 4-4b [T10E3].>
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.
<Ref. to 4-4b [T8D1].>
OK
Not OK
Replace hydraulic unit.
2. Check body short of solenoid valve.
<Ref. to 4-4b [T8D2].>
OK
Not OK
Replace hydraulic unit.
3. Check body short of harness.
<Ref. to 4-4b [T8D3].>
OK
Not OK
Repair harness.
4. Check harness between ABS/TCS control
module and hydraulic unit.
<Ref. to 4-4b [T8D4].>
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.
<Ref. to 4-4b [T8E1].>
OK
Not OK
Replace hydraulic unit.
2. Check body short of solenoid valve.
<Ref. to 4-4b [T8E2].>
OK
Not OK
Replace hydraulic unit.
3. Check body short of harness.
<Ref. to 4-4b [T8E3].>
OK
Not OK
Repair harness.
4. Check harness between ABS/TCS control
module and hydraulic unit.
<Ref. to 4-4b [T8E4].>
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 .
<Ref. to 4-4b [T10L0].>




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 .
<Ref. to 4-4b [T10M0].>
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 .
<Ref. to 4-4b [T10L0].>
109
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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 .
<Ref. to 4-4b [T10M0].>
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 .
<Ref. to 4-4b [T10L0].>
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 .
<Ref. to 4-4b [T10M0].>
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.
<Ref. to 4-4b [T8F1].>
OK
Not OK
Repair harness/connector.
2. Check harness connectors between power
supply generator, battery and ABS/TCS con-
trol module.
<Ref. to 4-4b [T8F2].>
OK
Not OK
Repair harness/connector.
3. Check sources of signal noise.
<Ref. to 4-4b [T8F3].>
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.
<Ref. to 4-4b [T8G1].>
OK
Not OK
Repair generator.
2. Check battery terminal.
<Ref. to 4-4b [T8G2].>
OK
Not OK
Repair battery terminal.
3. Check input voltage of ABS/TCS control mod-
ule.
<Ref. to 4-4b [T8G3].>
OK
Not OK
Repair harness/connector.
4. Check ground circuit of ABS/TCS control
module.
<Ref. to 4-4b [T8G4].>
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.
<Ref. to 4-4b [T8H1].>
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.
<Ref. to 4-4b [T8H2].>
OK
Not OK
Repair harness.
3. Check ABS/TCS control module internal
circuits.
<Ref. to 4-4b [T8H3].>
OK
Not OK
Replace ABS/TCS control module.
Replace engine control module.
4. Check output voltage of ECM.
<Ref. to 4-4b [T8H4].>
Not OK
OK
6. Check open circuit of harness.
OK Not OK
Replace ABS/TCS
control module.
5. Check body short of harness.
<Ref. to 4-4b [T8H5].>
OK
Not OK
Repair harness/connector.
Replace engine control module.






11 3
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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.
<Ref. to 4-4b [T8I2].>
OK
Not OK
Replace valve relay.
2. Check short circuit of valve relay.
<Ref. to 4-4b [T8I3].>
OK
Not OK
Replace valve relay.
3. Check ground circuit of valve relay.
<Ref. to 4-4b [T8I5].>
OK
Not OK
Repair harness/connector.
4. Check body short of harness.
<Ref. to 4-4b [T8I8].>
OK
Not OK
Repair harness.
Replace ABS/TCS control module.




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