Subaru Legacy (2005 year). Service manual — part 795
VDC(diag)-45
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
D: DTC C0027 REAR ABS WHEEL SPEED SENSOR LH POWER SUPPLY MAL-
FUNCTION
DTC DETECTING CONDITION:
Defective ABS wheel speed sensor
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:
VDC00309
MAIN SBF
SBF-6
No.33
B310
B310
E
E
6
14
VDCCM & H/U
1 2 3 4
11 12 13 14
27 28 29 30
15 16 17 18
31 32 33 34
19 20 21 22
35 36 37 38
23 24 25 26
39 40 41 42
5
6
7
8
9
10
BATTERY
GENERATOR
IGNITION
SWITCH
VDC(diag)-46
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
E: DTC C0021 OPEN/HIGH INPUT OF FRONT ABS WHEEL SPEED SENSOR RH
NOTE:
For the diagnostic procedure, refer to DTC C0027 “OPEN/HIGH INPUT OF REAR ABS WHEEL SPEED
SENSOR LH”. <Ref. to VDC(diag)-47, DTC C0027 OPEN/HIGH INPUT OF REAR ABS WHEEL SPEED
SENSOR LH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
F: DTC C0023 OPEN/HIGH INPUT OF FRONT ABS WHEEL SPEED SENSOR LH
NOTE:
For the diagnostic procedure, refer to DTC C0027 “OPEN/HIGH INPUT OF REAR ABS WHEEL SPEED
SENSOR LH”. <Ref. to VDC(diag)-47, DTC C0027 OPEN/HIGH INPUT OF REAR ABS WHEEL SPEED
SENSOR LH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
G: DTC C0025 OPEN/HIGH INPUT OF REAR ABS WHEEL SPEED SENSOR RH
NOTE:
For the diagnostic procedure, refer to DTC C0027 “OPEN/HIGH INPUT OF REAR ABS WHEEL SPEED
SENSOR LH”. <Ref. to VDC(diag)-47, DTC C0027 OPEN/HIGH INPUT OF REAR ABS WHEEL SPEED
SENSOR LH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
Step
Check
Yes
No
1
CHECK POOR CONTACT IN CONNECTOR.
Check if there is poor contact in VDCCM&H/U
power supply circuit.
Is there poor contact?
Repair the con-
nector.
2
CHECK VDCCM&H/U POWER SUPPLY CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the VDCCM&H/U connector.
3) Turn the ignition switch to ON.
4) Measure the voltage between VDCCM&H/
U connector terminals.
Terminals
(B310) No. 14 (+) — (B310) No. 6 (
−
):
Is the voltage 10 — 15 V?
Check the genera-
tor, battery and
VDCCM&H/U
power supply cir-
cuit.
3
CHECK VDCCM&H/U.
1) Connect all the connectors.
2) Perform the clear memory mode.
3) Perform the inspection mode.
4) Read the DTC.
Is the same DTC displayed?
Replace the
VDCCM&H/U.
4
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC.
It results from a
temporary noise
interference.
VDC(diag)-47
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
H: DTC C0027 OPEN/HIGH INPUT OF REAR ABS WHEEL SPEED SENSOR LH
DTC DETECTING CONDITION:
• Defective ABS wheel speed sensor (broken wire, input voltage too high)
• Defective harness connector
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:
• LHD model
B15
B6
R73
R72
B310
B98
1 2 3 4
11 12 13 14
27 28 29 30
15 16 17 18
31 32 33 34
19 20 21 22
35 36 37 38
23 24 25 26
39 40 41 42
5
6
7
8
9
10
VDC00299
38
23
25
41
40
24
6
B98
R72
R2
E
1
2
15
14
6
5
R73
1
2
1
2
1
2
B6
B15
21
22
B310
VDCCM & H/U
TWISTED WIRE
FRONT ABS
WHEEL SPEED
SENSOR LH
TWISTED WIRE
TWISTED WIRE
TWISTED WIRE
FRONT ABS
WHEEL SPEED
SENSOR RH
REAR ABS
WHEEL SPEED
SENSOR LH
REAR ABS
WHEEL SPEED
SENSOR RH
1 2
1 2 3
4 5 6 7
8 9 10 11 12 13 14 15 16
VDC(diag)-48
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
• RHD model
VDC00326
38
23
25
41
40
24
6
B97
R72
R1
E
1
2
19
18
8
7
R73
1
2
1
2
1
2
B6
B15
B15
B6
R73
R72
B310
21
22
B310
B97
VDCCM & H/U
TWISTED WIRE
FRONT ABS
WHEEL SPEED
SENSOR LH
1 2 3 4
11 12 13 14
27 28 29 30
15 16 17 18
31 32 33 34
19 20 21 22
35 36 37 38
23 24 25 26
39 40 41 42
5
6
7
8
9
10
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
TWISTED WIRE
TWISTED WIRE
TWISTED WIRE
FRONT ABS
WHEEL SPEED
SENSOR RH
REAR ABS
WHEEL SPEED
SENSOR LH
REAR ABS
WHEEL SPEED
SENSOR RH
1 2
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