Subaru Legacy IV (2008 year). Service manual — part 931
VDC(diag)-39
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
12.Diagnostic Procedure with Diagnostic Trouble Code (DTC)
A: DTC C0021 FRONT RIGHT ABS SENSOR CIRCUIT OPEN OR SHORT
NOTE:
For the diagnostic procedure, refer to DTC C0027 “RL WHEEL SPEED SENSOR CIRCUIT OPEN/HIGH IN-
PUT”. <Ref. to VDC(diag)-40, DTC C0027 REAR LEFT ABS SENSOR CIRCUIT OPEN OR SHORT, Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
B: DTC C0023 FRONT LEFT ABS SENSOR CIRCUIT OPEN OR SHORT
NOTE:
For the diagnostic procedure, refer to DTC C0027 “RL WHEEL SPEED SENSOR CIRCUIT OPEN/HIGH IN-
PUT”. <Ref. to VDC(diag)-40, DTC C0027 REAR LEFT ABS SENSOR CIRCUIT OPEN OR SHORT, Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
C: DTC C0025 REAR RIGHT ABS SENSOR CIRCUIT OPEN OR SHORT
NOTE:
For the diagnostic procedure, refer to DTC C0027 “RL WHEEL SPEED SENSOR CIRCUIT OPEN/HIGH IN-
PUT”. <Ref. to VDC(diag)-40, DTC C0027 REAR LEFT ABS SENSOR CIRCUIT OPEN OR SHORT, Diag-
nostic Procedure with Diagnostic Trouble Code (DTC).>
VDC(diag)-40
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
D: DTC C0027 REAR LEFT ABS SENSOR CIRCUIT OPEN OR SHORT
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:
4
3
1
26
27
2
25
B98
R72
R2
E
1
2
15
14
6
5
R73
1
2
B6
B15
R73
R72
1
2
1 2
2 1
6
5
B310
2
1
B15
B6
VDCCM & H/U
B310
4 5 6 7 8 9
26 27 28 29 30
2 3
1
31 32 33 34 35 36
10 11
14 15 16 17 18 19
37 38 39 40
12 13
41 42 43 44 45 46
20 21
23
24
22
25
VDC00501
B98
1 2 3
4 5 6 7
8 9 10 11 12 13 14 15 16
TWISTED P
AIR LINE
TWISTED P
AIR LINE
TWISTED P
AIR LINE
TWISTED P
AIR LINE
TWISTED P
AIR LINE
TWISTED P
AIR LINE
FRONT ABS
WHEEL SPEED
SENSOR LH
FRONT ABS
WHEEL SPEED
SENSOR RH
REAR ABS
WHEEL SPEED
SENSOR LH
REAR ABS
WHEEL SPEED
SENSOR RH
VDC(diag)-41
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK POOR CONTACT IN CONNECTOR.
Check if there is poor contact between
VDCCM&H/U and ABS wheel speed sensor.
Is there poor contact?
Repair the connec-
tor.
Go to step 2.
2
CHECK HARNESS CONNECTOR BETWEEN
VDCCM&H/U AND ABS WHEEL SPEED
SENSOR.
1) Disconnect the connector (B310) from the
VDCCM&H/U.
2) Disconnect the connector from the ABS
wheel speed sensor.
3) Measure the resistance between
VDCCM&H/U connector and ABS wheel speed
sensor connector.
Connector & terminal
DTC C0021
(B310) No. 6 — (B6) No. 1:
(B310) No. 5 — (B6) No. 2:
DTC C0023
(B310) No. 1 — (B15) No. 1:
(B310) No. 26 — (B15) No. 2:
DTC C0025
(B310) No. 3 — (R72) No. 1:
(B310) No. 4 — (R72) No. 2:
DTC C0027
(B310) No. 2 — (R73) No. 1:
(B310) No. 27 — (R73) No. 2:
Is the resistance less than 0.5
:? Go to step 3.
Repair the harness
connector between
VDCCM&H/U and
ABS wheel speed
sensor.
3
CHECK GROUND SHORT OF HARNESS.
Measure the resistance between VDCCM&H/U
connector and chassis ground.
Connector & terminal
DTC C0021
(B310) No. 6 — Chassis ground:
DTC C0023
(B310) No. 1 — Chassis ground:
DTC C0025
(B310) No. 4 — Chassis ground:
DTC C0027
(B310) No. 27 — Chassis ground:
Is the resistance 1 M
: or
more?
Go to step 4.
Repair the harness
connector between
VDCCM&H/U and
ABS wheel speed
sensor.
4
CHECK ABS WHEEL SPEED SENSOR POW-
ER SUPPLY CIRCUIT.
1) Connect the VDCCM&H/U connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between ABS wheel
speed sensor connector and chassis ground.
Connector & terminal
DTC C0021
(B6) No. 2 (+) — Chassis ground (–):
DTC C0023
(B15) No. 2 (+) — Chassis ground (–):
DTC C0025
(R72) No. 1 (+) — Chassis ground (–):
DTC C0027
(R73) No. 1 (+) — Chassis ground (–):
Is the voltage 5 — 16 V?
Go to step 6.
Go to step 5.
VDC(diag)-42
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
E: DTC C0022 FRONT RIGHT ABS SENSOR SIGNAL
NOTE:
For the diagnostic procedure, refer to DTC C0028 “RL WHEEL SPEED SENSOR SIGNAL”. <Ref. to VDC(di-
ag)-43, DTC C0028 REAR LEFT ABS SENSOR SIGNAL, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
F: DTC C0024 FRONT LEFT ABS SENSOR SIGNAL
NOTE:
For the diagnostic procedure, refer to DTC C0028 “RL WHEEL SPEED SENSOR SIGNAL”. <Ref. to VDC(di-
ag)-43, DTC C0028 REAR LEFT ABS SENSOR SIGNAL, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
G: DTC C0026 REAR RIGHT ABS SENSOR SIGNAL
NOTE:
For the diagnostic procedure, refer to DTC C0028 “RL WHEEL SPEED SENSOR SIGNAL”. <Ref. to VDC(di-
ag)-43, DTC C0028 REAR LEFT ABS SENSOR SIGNAL, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
5
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.
Connector & terminal
(B310) No. 28 (+) — (B310) No. 25 (–):
Is the voltage 10 — 15 V?
Go to step 6.
Check the genera-
tor, battery and
VDCCM&H/U
power supply cir-
cuit.
6
CHECK ABS WHEEL SPEED SENSOR SIG-
NAL.
1) Install the ABS wheel speed sensor.
2) Prepare an oscilloscope.
3) Check the ABS wheel speed sensor. <Ref.
to ABS-14, ABS WHEEL SPEED SENSOR,
INSPECTION, Front ABS Wheel Speed Sen-
sor.>
Is the pattern the same wave-
form as shown in the figure?
Go to step 7.
Replace the ABS
wheel speed sen-
sor.
7
CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-23,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-22, PROCEDURE, Inspection
Mode.>
4) Read the DTC.
Is the same DTC displayed?
Replace the
VDCCM only.
<Ref. to VDC-10,
REPLACEMENT,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
Go to step 8.
8
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC. <Ref. to
VDC(diag)-34, List
of Diagnostic Trou-
ble Code (DTC).>
It results from a
temporary noise
interference.
Step
Check
Yes
No
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