Subaru Legacy (2005 year). Service manual — part 800
VDC(diag)-65
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)-66
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AB:DTC C0042 ABS WHEEL SPEED SENSOR POWER MALFUNCTION
NOTE:
For the diagnostic procedure, refer to DTC C0042 “POWER VOLTAGE MALFUNCTION”. <Ref. to VDC(di-
ag)-64, DTC C0042 POWER VOLTAGE MALFUNCTION, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
Step
Check
Yes
No
1
CHECK GENERATOR.
1) Start the engine.
2) Run the engine at idle after warming up.
3) Measure the voltage between generator B
terminal and chassis ground.
Terminals
Generator B terminal (+) — Chassis
ground (
−
):
Is the voltage 10 — 15 V?
Repair the genera-
tor. <Ref. to
SC(H4SO 2.0)-14,
Generator.>
2
CHECK BATTERY TERMINAL.
Turn the ignition switch to OFF.
Are the positive and negative
battery terminals clamped
tightly?
Tighten the termi-
nal.
3
CHECK INPUT VOLTAGE FOR VDCCM&H/
U.
1) Disconnect the connector from VDCCM&H/
U.
2) Run the engine at idle.
3) Operate the devices such as headlights, air
conditioner, defogger, etc. which produce
much electrical loading.
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.
4
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.
5
CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
nector between generator, bat-
tery and VDCCM&H/U?
Repair the con-
nector.
6
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).>
7
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.
VDC(diag)-67
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AC:DTC C0044 AT COMMUNICATION
DTC DETECTING CONDITION:
No CAN signal from TCM.
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
Step
Check
Yes
No
1
CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to
LAN(diag)-24, OPERATION, Read Diagnostic
Trouble Code (DTC).>
Is there any fault in LAN sys-
tem?
Perform the diag-
nosis according to
DTC for LAN sys-
tem.
2
CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in TCM
connector?
Repair the con-
nector.
3
CHECK TCM.
Is the TCM normal?
Replace the TCM.
<Ref. to 4AT-66,
Transmission Con-
trol Module
(TCM).> <Ref. to
5AT-61, Transmis-
sion Control Mod-
ule (TCM).>
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.
5
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)-68
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AD:DTC C0045 DIFFERENT VDC CONTROL MODULE SPECIFICATION
DTC DETECTING CONDITION:
Different control module specification
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
Step
Check
Yes
No
1
CHECK VDCCM&H/U SPECIFICATION.
Check the identification mark of VDCCM&H/U.
Identification mark of VDCCM&H/U
OUTBACK 3.0 R: G2
Wagon model 2.5 i: G3
Wagon model 3.0 R (AT model): G4
Sedan model 2.5 i: G9
Sedan model 3.0 R (AT model): GA
OUTBACK 2.5 i: GE
Wagon model 3.0 R (MT model): GH
Sedan model 3.0 R (MT model): GJ
Is the identification mark of
VDCCM&H/U the same as
vehicle specification?
Replace the
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
2
CHECK TCM SPECIFICATION.
Check the TCM specification.
Is the specification of TCM
same as vehicle specification?
Replace the TCM.
<Ref. to 4AT-66,
Transmission Con-
trol Module
(TCM).> <Ref. to
5AT-61, Transmis-
sion Control Mod-
ule (TCM).>
3
CHECK AT SYSTEM.
1) Start the engine.
2) Check the DTC in AT system.
Is DTC of AT system dis-
played?
Repair the AT sys-
tem.
4
CHECK ECM SPECIFICATION.
Check the ECM specification.
Is the specification of ECM
same as vehicle specification?
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.
6
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Perform the diag-
nosis according to
DTC.
It results from a
temporary noise
interference.
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