Subaru Legacy III (2000-2003 year). Manual - part 748

VDC-28

VDC (DIAGNOSTICS)

LIST OF DIAGNOSTIC TROUBLE CODE (DTC)

31

Abnormal sole-
noid valve cir-
cuit(s)

Front right inlet valve

<Ref. to VDC-63, DTC 31 ABNORMAL INLET AND CUT SOLENOID 
VALVE CIRCUIT(S) (FRONT RH INLET), Diagnostics Chart with Diagno-
sis Connector.>

32

Front right outlet valve

<Ref. to VDC-68, DTC 32 ABNORMAL OUTLET AND SUCTION SOLE-
NOID VALVE CIRCUIT(S) (FRONT RH OUTLET), Diagnostics Chart with 
Diagnosis Connector.>

33

Front left inlet valve

<Ref. to VDC-63, DTC 33 ABNORMAL INLET AND CUT SOLENOID 
VALVE CIRCUIT(S) (FRONT LH INLET), Diagnostics Chart with Diagno-
sis Connector.>

34

Front left outlet valve

<Ref. to VDC-68, DTC 34 ABNORMAL OUTLET AND SUCTION SOLE-
NOID VALVE CIRCUIT(S) (FRONT LH OUTLET), Diagnostics Chart with 
Diagnosis Connector.>

35

Rear right inlet valve

<Ref. to VDC-63, DTC 35 ABNORMAL INLET AND CUT SOLENOID 
VALVE CIRCUIT(S) (REAR RH INLET), Diagnostics Chart with Diagnosis 
Connector.>

36

Rear right outlet valve

<Ref. to VDC-68, DTC 36 ABNORMAL OUTLET AND SUCTION SOLE-
NOID VALVE CIRCUIT(S) (REAR RH OUTLET), Diagnostics Chart with 
Diagnosis Connector.>

37

Rear left inlet valve

<Ref. to VDC-63, DTC 37 ABNORMAL INLET AND CUT SOLENOID 
VALVE CIRCUIT(S) (REAR LH INLET), Diagnostics Chart with Diagnosis 
Connector.>

38

Rear left outlet valve

<Ref. to VDC-68, DTC 38 ABNORMAL OUTLET AND SUCTION SOLE-
NOID VALVE CIRCUIT(S) (REAR LH OUTLET), Diagnostics Chart with 
Diagnosis Connector.>

61

Primary cut valve

<Ref. to VDC-63, DTC 61 ABNORMAL INLET AND CUT SOLENOID 
VALVE CIRCUIT(S) (PRIMARY CUT), Diagnostics Chart with Diagnosis 
Connector.>

62

Secondary cut valve

<Ref. to VDC-64, DTC 62 ABNORMAL INLET AND CUT SOLENOID 
VALVE CIRCUIT(S) (SECONDARY CUT), Diagnostics Chart with Diagno-
sis Connector.>

63

Primary suction valve

<Ref. to VDC-68, DTC 63 ABNORMAL OUTLET AND SUCTION SOLE-
NOID VALVE CIRCUIT(S) (PRIMARY SUCTION), Diagnostics Chart with 
Diagnosis Connector.>

64

Secondary suction 
valve

<Ref. to VDC-70, DTC 64 ABNORMAL OUTLET AND SUCTION SOLE-
NOID VALVE CIRCUIT(S) (SECONDARY SUCTION), Diagnostics Chart 
with Diagnosis Connector.>

41

Abnormal VDC control module

<Ref. to VDC-74, DTC 41 ABNORMAL VDC CONTROL MODULE, Diag-
nostics Chart with Diagnosis Connector.> 

42

Source voltage is abnormal.

<Ref. to VDC-76, DTC 42 SOURCE VOLTAGE IS ABNORMAL., Diagnos-
tics Chart with Diagnosis Connector.> 

43

Faulty VDCCM-ECM communication line

<Ref. to VDC-78, DTC 43 FAULTY VDCCM — ECM COMMUNICATION 
LINE, Diagnostics Chart with Diagnosis Connector.> 

44

A communication with AT control abnor-
mal

<Ref. to VDC-82, DTC 44 A COMMUNICATION WITH AT CONTROL 
ABNORMAL, Diagnostics Chart with Diagnosis Connector.> 

45

Control module out of specification

<Ref. to VDC-84, DTC 45 CONTROL MODULE OUT OF SPECIFICA-
TION, Diagnostics Chart with Diagnosis Connector.>

46

Abnormal voltage of 5 V power supply

<Ref. to VDC-86, DTC 46 ABNORMAL VOLTAGE OF 5 V POWER SUP-
PLY, Diagnostics Chart with Diagnosis Connector.> 

47

Faulty CAN communication line

<Ref. to VDC-90, DTC 47 FAULTY CAN COMMUNICATION LINE, Diag-
nostics Chart with Diagnosis Connector.> 

48

Faulty ECM-VDCCM communication line

<Ref. to VDC-94, DTC 48 FAULTY ECM — VDCCM COMMUNICATION 
LINE, Diagnostics Chart with Diagnosis Connector.> 

49

Abnormal engine speed signal

<Ref. to VDC-98, DTC 49 ABNORMAL ENGINE SPEED SIGNAL, Diag-
nostics Chart with Diagnosis Connector.>

51

Abnormal valve relay

<Ref. to VDC-100, DTC 51 ABNORMAL VALVE RELAY, Diagnostics 
Chart with Diagnosis Connector.>

DTC No.

Contents of diagnosis

Index No.

VDC-29

VDC (DIAGNOSTICS)

LIST OF DIAGNOSTIC TROUBLE CODE (DTC)

If any of the following multiple diagnostic trouble codes (DTCs) are present in memory, check the area cor-
responding to the first diagnostic trouble code (DTC). If no problem is detected, check the areas correspond-
ing to the other diagnostic trouble codes (DTCs) in order of their appearance.

2. WITH SUBARU SELECT MONITOR

52

Abnormal motor and/or motor relay

<Ref. to VDC-108, DTC 52 ABNORMAL MOTOR AND/OR MOTOR 
RELAY, Diagnostics Chart with Diagnosis Connector.>

71

Abnormal steering angle sensor

<Ref. to VDC-114, DTC 71 ABNORMAL STEERING ANGLE SENSOR, 
Diagnostics Chart with Diagnosis Connector.>

72

Abnormal yaw rate sensor

<Ref. to VDC-118, DTC 72 ABNORMAL YAW RATE SENSOR, Diagnos-
tics Chart with Diagnosis Connector.>

73

Abnormal lateral G sensor

<Ref. to VDC-122, DTC 73 ABNORMAL LATERAL G SENSOR, Diagnos-
tics Chart with Diagnosis Connector.>

74

Abnormal pressure sensor

<Ref. to VDC-126, DTC 74 ABNORMAL PRESSURE SENSOR, Diagnos-
tics Chart with Diagnosis Connector.>

Combination 

of DTC No.

Problem area

Index No.

46, 74

(F87) — No. 78, 68 or 69 lead circuit 
is shorted to ground or battery.

<Ref. to VDC-86, DTC 46 ABNORMAL VOLTAGE OF 5 V POWER SUP-
PLY, Diagnostics Chart with Diagnosis Connector.>

44, 71

(F87) — No. 83 or 81 lead circuit is 
open.

<Ref. to VDC-114, DTC 71 ABNORMAL STEERING ANGLE SENSOR, 
Diagnostics Chart with Diagnosis Connector.>

51, 48, 71

(F87) — No. 27 lead circuit is open.

<Ref. to VDC-114, DTC 71 ABNORMAL STEERING ANGLE SENSOR, 
Diagnostics Chart with Diagnosis Connector.>

71, 51, 44

(F87) — No. 27 lead circuit is open.

<Ref. to VDC-114, DTC 71 ABNORMAL STEERING ANGLE SENSOR, 
Diagnostics Chart with Diagnosis Connector.>

72, 73

(F87) — No. 63 lead circuit is open.

<Ref. to VDC-122, DTC 73 ABNORMAL LATERAL G SENSOR, Diagnos-
tics Chart with Diagnosis Connector.>

DTC No.

Display screen

Contents of diagnosis

Index No.

—

Communication for ini-
tializing impossible

Select monitor commu-
nication failure

<Ref. to VDC-130, COMMUNICATION FOR INITIALIZING 
IMPOSSIBLE (SELECT MONITOR COMMUNICATION FAIL-
URE), Diagnostics Chart with Select Monitor.>

—

No trouble code

Although no diagnostic 
trouble code appears 
on the select monitor 
display, the ABS warn-
ing light and/or VDC 
warning light and/or 
VDC operating indicator 
light and/or VDC OFF 
indicator light remains 
on.

<Ref. to VDC-33, Diagnostics Chart with Diagnosis Connec-
tor.>

—

No trouble code

Although no diagnostic 
trouble code appears 
on the select monitor 
display, the ABS warn-
ing light and/or VDC 
warning light and/or 
VDC operating indicator 
light and/or VDC OFF 
indicator light remains 
off.

<Ref. to VDC-33, Diagnostics Chart with Diagnosis Connec-
tor.>

21

Front right ABS sensor 
circuit open or shorted 
battery

Open or short circuit in 
front right ABS sensor 
circuit

<Ref. to VDC-133, DTC 21 FRONT RIGHT ABS SENSOR CIR-
CUIT OPEN OR SHORTED BATTERY, Diagnostics Chart with 
Select Monitor.>

22

Front right ABS sensor 
signal

Front right ABS sensor 
abnormal signal

<Ref. to VDC-139, DTC 22 FRONT RIGHT ABS SENSOR SIG-
NAL, Diagnostics Chart with Select Monitor.>

DTC No.

Contents of diagnosis

Index No.

VDC-30

VDC (DIAGNOSTICS)

LIST OF DIAGNOSTIC TROUBLE CODE (DTC)

23

Front left ABS sensor 
circuit open or shorted 
battery

Open or short circuit in 
front left ABS sensor 
circuit

<Ref. to VDC-133, DTC 23 FRONT LEFT ABS SENSOR CIR-
CUIT OPEN OR SHORTED BATTERY, Diagnostics Chart with 
Select Monitor.> 

24

Front left ABS sensor 
signal

Front left ABS sensor 
abnormal signal

<Ref. to VDC-139, DTC 24 FRONT LEFT ABS SENSOR SIG-
NAL, Diagnostics Chart with Select Monitor.>

25

Rear right ABS sensor 
circuit open or shorted 
battery

Open or short circuit in 
rear right ABS sensor 
circuit

<Ref. to VDC-133, DTC 25 REAR RIGHT ABS SENSOR CIR-
CUIT OPEN OR SHORTED BATTERY, Diagnostics Chart with 
Select Monitor.> 

26

Rear right ABS sensor 
signal

Rear right ABS sensor 
abnormal signal

<Ref. to VDC-139, DTC 26 REAR RIGHT ABS SENSOR SIG-
NAL, Diagnostics Chart with Select Monitor.>

27

Rear left ABS sensor 
circuit open or shorted 
battery

Open or short circuit in 
rear left ABS sensor cir-
cuit

<Ref. to VDC-134, DTC 27 REAR LEFT ABS SENSOR CIR-
CUIT OPEN OR SHORTED BATTERY, Diagnostics Chart with 
Select Monitor.>

28

Rear left ABS sensor 
signal

Rear left ABS sensor 
abnormal signal

<Ref. to VDC-140, DTC 28 REAR LEFT ABS SENSOR SIG-
NAL, Diagnostics Chart with Select Monitor.>

29

Any one of four ABS 
sensor signal

Abnormal ABS sensor 
signal on any one of 
four sensor

<Ref. to VDC-146, DTC 29 ANY ONE OF FOUR ABS SENSOR 
SIGNAL, Diagnostics Chart with Select Monitor.>

31

FR hold valve malfunc-
tion

Front right inlet sole-
noid valve

<Ref. to VDC-149, DTC 31 FR HOLD VALVE MALFUNCTION 
(FRONT RIGHT INLET VALVE MALFUNCTION), Diagnostics 
Chart with Select Monitor.>

32

FR pressure reducing 
valve malfunction

Front right outlet sole-
noid valve malfunction

<Ref. to VDC-154, DTC 32 FR PRESSURE REDUCING 
VALVE MALFUNCTION (FRONT RIGHT OUTLET VALVE 
MALFUNCTION), Diagnostics Chart with Select Monitor.>

33

FL hold valve malfunc-
tion

Front left inlet solenoid 
valve malfunction

<Ref. to VDC-149, DTC 33 FL HOLD VALVE MALFUNCTION 
(FRONT LEFT INLET VALVE MALFUNCTION), Diagnostics 
Chart with Select Monitor.>

34

FL pressure reducing 
valve malfunction

Front left outlet sole-
noid valve

<Ref. to VDC-154, DTC 34 FL PRESSURE REDUCING 
VALVE MALFUNCTION (FRONT LEFT OUTLET VALVE MAL-
FUNCTION), Diagnostics Chart with Select Monitor.>

35

RR hold valve malfunc-
tion

Rear right inlet solenoid 
valve malfunction

<Ref. to VDC-149, DTC 35 RR HOLD VALVE MALFUNCTION 
(REAR RIGHT INLET VALVE MALFUNCTION), Diagnostics 
Chart with Select Monitor.>

36

RR pressure reducing 
valve malfunction

Rear right outlet sole-
noid valve

<Ref. to VDC-154, DTC 36 RR PRESSURE REDUCING 
VALVE MALFUNCTION (REAR RIGHT OUTLET VALVE MAL-
FUNCTION), Diagnostics Chart with Select Monitor.>

37

RL hold valve malfunc-
tion

Rear left inlet solenoid 
valve malfunction

<Ref. to VDC-149, DTC 37 RL HOLD VALVE MALFUNCTION 
(REAR LEFT INLET VALVE MALFUNCTION), Diagnostics 
Chart with Select Monitor.>

38

RL pressure reducing 
valve malfunction

Rear left outlet solenoid 
valve

<Ref. to VDC-154, DTC 38 RL PRESSURE REDUCING 
VALVE MALFUNCTION (REAR LEFT OUTLET VALVE MAL-
FUNCTION), Diagnostics Chart with Select Monitor.>

41

Electrical control mod-
ule

VDC control module 
malfunction

<Ref. to VDC-160, DTC 41 ELECTRICAL CONTROL MODULE 
(VDC CONTROL MODULE MALFUNCTION), Diagnostics 
Chart with Select Monitor.>

42

Power supply voltage 
low

Power supply voltage 
too low

<Ref. to VDC-162, DTC 42 POWER SUPPLY VOLTAGE LOW, 
Diagnostics Chart with Select Monitor.>

43

AET communication 
line malfunction

AET communication 
line malfunction

<Ref. to VDC-164, DTC 43 AET COMMUNICATION LINE 
MALFUNCTION, Diagnostics Chart with Select Monitor.>

43

AEB communication 
line malfunction

AEB communication 
line malfunction

<Ref. to VDC-168, DTC 43 AEB COMMUNICATION LINE 
MALFUNCTION, Diagnostics Chart with Select Monitor.>

43

AEC communication 
line malfunction

AEC communication 
line malfunction

<Ref. to VDC-172, DTC 43 AEC COMMUNICATION LINE 
MALFUNCTION, Diagnostics Chart with Select Monitor.>

44

TCM communication 
circuit

TCM communication 
line malfunction

<Ref. to VDC-176, DTC 44 TCM COMMUNICATION CIRCUIT, 
Diagnostics Chart with Select Monitor.>

45

Incorrect VDC control 
module

Incorrect VDC control 
module

<Ref. to VDC-178, DTC 45 INCORRECT VDC CONTROL 
MODULE, Diagnostics Chart with Select Monitor.>

DTC No.

Display screen

Contents of diagnosis

Index No.

VDC-31

VDC (DIAGNOSTICS)

LIST OF DIAGNOSTIC TROUBLE CODE (DTC)

45

TCM malfunction speci-
fications

TCM malfunction speci-
fications

<Ref. to VDC-180, DTC 45 TCM MALFUNCTION SPECIFICA-
TIONS, Diagnostics Chart with Select Monitor.>

46

Abnormal voltage of 5 V 
power supply

Abnormal voltage of 5 V 
power supply

<Ref. to VDC-182, DTC 46 ABNORMAL VOLTAGE OF 5 V 
POWER SUPPLY, Diagnostics Chart with Select Monitor.>

47

Improper CAN commu-
nication

CAN communication 
line malfunction

<Ref. to VDC-186, DTC 47 IMPROPER CAN COMMUNICA-
TION, Diagnostics Chart with Select Monitor.>

48

Improper EAC commu-
nication

EAC communication 
line malfunction

<Ref. to VDC-190, DTC 48 IMPROPER EAC COMMUNICA-
TION, Diagnostics Chart with Select Monitor.>

48

EAS communication 
line grounding shorted

EAS communication 
line grounding

<Ref. to VDC-194, DTC 48 EAS COMMUNICATION LINE 
GROUNDING SHORTED, Diagnostics Chart with Select Moni-
tor.>

48

Erroneous communica-
tion from EGI to VDC

Faulty ECM-VDCCM 
communication line

<Ref. to VDC-196, DTC 48 ERRONEOUS COMMUNICATION 
FROM EGI TO VDC, Diagnostics Chart with Select Monitor.>

49

Abnormal engine speed 
signal

Abnormal engine speed 
signal

<Ref. to VDC-200, DTC 49 ABNORMAL ENGINE SPEED SIG-
NAL, Diagnostics Chart with Select Monitor.>

51

Valve relay

Valve relay malfunction

<Ref. to VDC-202, DTC 51 VALVE RELAY, Diagnostics Chart 
with Select Monitor.>

51

Valve relay ON failure

Valve relay ON failure

<Ref. to VDC-208, DTC 51 VALVE RELAY ON FAILURE, Diag-
nostics Chart with Select Monitor.>

52

Motor and motor relay 
OFF failure

Motor and motor relay 
OFF failure

<Ref. to VDC-214, DTC 52 MOTOR AND MOTOR RELAY OFF 
FAILURE, Diagnostics Chart with Select Monitor.>

52

Motor and motor relay 
ON failure

Motor and motor relay 
ON failure

<Ref. to VDC-218, DTC 52 MOTOR AND MOTOR RELAY ON 
FAILURE, Diagnostics Chart with Select Monitor.>

52

Motor malfunction

Motor malfunction

<Ref. to VDC-224, DTC 52 MOTOR MALFUNCTION, Diagnos-
tics Chart with Select Monitor.>

61

Normal opening valve 2 
malfunction

Primary cut valve mal-
function

<Ref. to VDC-149, DTC 61 NORMAL OPENING VALVE 2 
MALFUNCTION (PRIMARY CUT VALVE MALFUNCTION), 
Diagnostics Chart with Select Monitor.>

62

Normal opening valve 1 
malfunction

Secondary cut valve 
malfunction

<Ref. to VDC-150, DTC 62 NORMAL OPENING VALVE 1 
MALFUNCTION (SECONDARY CUT VALVE MALFUNCTION), 
Diagnostics Chart with Select Monitor.>

63

Normal closing valve 2 
malfunction

Primary suction valve 
malfunction

<Ref. to VDC-154, DTC 63 NORMAL CLOSING VALVE 2 MAL-
FUNCTION (PRIMARY SUCTION VALVE MALFUNCTION), 
Diagnostics Chart with Select Monitor.>

64

Normal closing valve 1 
malfunction

Secondary suction 
valve malfunction

<Ref. to VDC-156, DTC 64 NORMAL CLOSING VALVE 1 MAL-
FUNCTION (SECONDARY SUCTION VALVE MALFUNC-
TION), Diagnostics Chart with Select Monitor.>

71

Steering angle sensor 
offset is too big.

Steering angle sensor 
offset is too big.

<Ref. to VDC-228, DTC 71 STEERING ANGLE SENSOR OFF-
SET IS TOO BIG., Diagnostics Chart with Select Monitor.>

71

Change range of steer-
ing angle sensor is too 
big.

Change range of steer-
ing angle sensor is too 
big.

<Ref. to VDC-230, DTC 71 CHANGE RANGE OF STEERING 
ANGLE SENSOR IS TOO BIG., Diagnostics Chart with Select 
Monitor.> 

71

Steering angle sensor 
malfunction

Steering angle sensor 
malfunction

<Ref. to VDC-232, DTC 71 STEERING ANGLE SENSOR MAL-
FUNCTION, Diagnostics Chart with Select Monitor.>

71

No signal from steering 
angle sensor

No signal from steering 
angle sensor

<Ref. to VDC-234, DTC 71 NO SIGNAL FROM STEERING 
ANGLE SENSOR, Diagnostics Chart with Select Monitor.>

72

Abnormal yaw rate sen-
sor output

Abnormal yaw rate sen-
sor output

<Ref. to VDC-238, DTC 72 ABNORMAL YAW RATE SENSOR 
OUTPUT, Diagnostics Chart with Select Monitor.>

72

Voltage inputted to yaw 
rate sensor exceeds 
specification.

Voltage inputted to yaw 
rate sensor exceeds 
specification.

<Ref. to VDC-242, DTC 72 VOLTAGE INPUTTED TO YAW 
RATE SENSOR EXCEEDS SPECIFICATION., Diagnostics 
Chart with Select Monitor.>

72

Abnormal yaw rate sen-
sor reference voltage

Abnormal yaw rate sen-
sor reference voltage

<Ref. to VDC-246, DTC 72 ABNORMAL YAW RATE SENSOR 
REFERENCE VOLTAGE, Diagnostics Chart with Select Moni-
tor.>

72

Change range of yaw 
rate sensor signal is too 
big.

Change range of yaw 
rate sensor signal is too 
big.

<Ref. to VDC-250, DTC 72 CHANGE RANGE OF YAW RATE 
SENSOR SIGNAL IS TOO BIG., Diagnostics Chart with Select 
Monitor.>

DTC No.

Display screen

Contents of diagnosis

Index No.