Subaru Legacy (2005 year). Service manual — part 799
VDC(diag)-61
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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)-62
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK INPUT VOLTAGE FOR VDCCM&H/
U.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from VDCCM&H/
U.
3) Run the engine at idle.
4) Measure the voltage between VDCCM&H/
U connector and chassis ground.
Connector & terminal
(B310) No. 14 (+) — Chassis ground (
−
):
Is the voltage 10 — 15 V?
Repair the power
supply circuit.
2
CHECK GROUND CIRCUIT OF VDCCM&H/U.
1) Turn the ignition switch to OFF.
2) Measure the resistance between
VDCCM&H/U connector and chassis ground.
Connector & terminal
(B310) No. 6 — Chassis ground:
Is the resistance less than 0.5
Ω?
Repair the
VDCCM&H/U
ground harness.
3
CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
nector between generator, bat-
tery and VDCCM&H/U?
Repair the con-
nector.
4
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.
<Ref. to VDC-7,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
5
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC.
Temporary poor
contact occurs.
VDC(diag)-63
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Z: DTC C0041 VDC CONTROL MODULE MALFUNCTION
DTC DETECTING CONDITION:
Defective VDCCM&H/U
TROUBLE SYMPTOM:
• ABS does not operate.
• EBD does not operate.
• VDC does not operate.
WIRING DIAGRAM:
VDC00217
VDCCM & H/U
6
B310
B310
E
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
VDC(diag)-64
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AA:DTC C0042 POWER VOLTAGE MALFUNCTION
DTC DETECTING CONDITION:
Defective VDCCM&H/U power voltage
TROUBLE SYMPTOM:
• ABS does not operate.
• EBD may not operate.
• VDC does not operate.
NOTE:
Warning lights go off if voltage returns.
Step
Check
Yes
No
1
CHECK GROUND CIRCUIT OF VDCCM&H/U.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from VDCCM&H/
U.
3) Measure the resistance between
VDCCM&H/U and chassis ground.
Connector & terminal
(B310) No. 6 — Chassis ground:
Is the resistance less than 0.5
Ω?
Repair the
VDCCM&H/U
ground harness.
2
CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
nectors between battery, igni-
tion switch and VDCCM&H/U?
Repair the con-
nector.
3
CHECK SOURCES OF SIGNAL NOISE.
Are the radio wave devices and
electric components installed
correctly?
Install the radio
wave devices and
electric compo-
nents properly.
4
CHECK SOURCES OF SIGNAL NOISE.
Are noise sources (such as an
antenna) installed near the
sensor harness?
Install the noise
sources apart from
sensor harness.
5
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.
<Ref. to VDC-7,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
6
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC. <Ref. to
VDC(diag)-38, List
of Diagnostic Trou-
ble Code (DTC).>
Temporary poor
contact occurs.
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