Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 542
VDC(diag)-67
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Y: DTC C0042 POWER SUPPLY VOLTAGE FAILURE
DTC DETECTING CONDITION:
Improper VDCCM&H/U power supply voltage
TROUBLE SYMPTOM:
• ABS does not operate.
• EBD may not operate.
• VDC does not operate.
NOTE:
Warning lights go off if voltage returns.
WIRING DIAGRAM:
Vehicle Dynamics Control System <Ref. to WI-67, Vehicle Dynamics Control System.>
MAIN SBF
SBF-6
No.33
B310
E
E
25
2
8
VDCCM & H/U
BATTERY
GENERATOR
IGNITION
SWITCH
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
VDC00463
VDC(diag)-68
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
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 ter-
minal B and chassis ground.
Terminals
Generator terminal B (+) — Chassis
ground (–):
Is the voltage 10 — 15 V?
Repair the genera-
tor.
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 VDCCM&H/U INPUT VOLTAGE.
1) Disconnect the connector from the
VDCCM&H/U.
2) Run the engine at idle.
3) Operate devices such as headlights, air
conditioner, defogger, etc. which produce an
electrical load.
4) Measure the voltage between VDCCM&H/U
connector and chassis ground.
Connector & terminal
(B310) No. 28 (+) — Chassis ground (–):
Is the voltage 10 — 15 V?
Repair the power
supply circuit.
4
CHECK VDCCM&H/U GROUND CIRCUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between
VDCCM&H/U connector and chassis ground.
Connector & terminal
(B310) No. 25 — Chassis ground:
Is the resistance less than 10
Ω?
Repair the
VDCCM&H/U
ground harness.
5
CHECK POOR CONTACT OF CONNEC-
TORS.
Is there poor contact of connec-
tor between generator, battery
and VDCCM&H/U?
Repair the connec-
tor.
6
CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-27,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-26, Inspection Mode.>
4) Read the DTC.
Is the same DTC displayed?
7
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
Temporary poor
contact occurs.
VDC(diag)-69
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Z: DTC C0045 INCORRECT VDC CONTROL MODULE SPECIFICATIONS
DTC DETECTING CONDITION:
Different control module specification
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
NOTE:
When parameter selection for VDCCM is improper, this DTC may be memorized.
Step
Check
Yes
No
1
CHECK VDCCM REPLACEMENT HISTORY. Is there history of VDCCM
replacement by itself?
2
CHECK VDCCM IDENTIFICATION SYMBOL.
Check the identification symbol of the seal
attached on the side of the VDCCM. <Ref. to
VDC-2, SPECIFICATION, General Descrip-
tion.>
Is the identification symbol cor-
rect?
3
CHECK VDCCM&H/U IDENTIFICATION
SYMBOL.
Check the identification symbol stamped on the
upper part of the H/U. <Ref. to VDC-2, SPECI-
FICATION, General Description.>
Is the identification symbol cor-
rect?
Replace the
VDCCM&H/U.
<Ref. to VDC-8,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
4
CHECK PARAMETER SELECTED IN VDC-
CM.
<Ref. to VDC(diag)-21, PARAMETER CHECK,
OPERATION, Subaru Select Monitor.>
Does the parameter registered
in the VDCCM match the rele-
vant vehicle?
5
CHECK ECM SPECIFICATION.
Check the ECM specification.
Is the specification of ECM
same as vehicle specification?
6
CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-27,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-26, Inspection Mode.>
4) Read the DTC.
Is the same DTC displayed?
7
CHECK OTHER DTC DETECTION.
Is any other DTC displayed?
It results from a
temporary noise
interference.
VDC(diag)-70
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AA:DTC C0047 CAN COMMUNICATION
DTC DETECTING CONDITION:
CAN communication line circuit is open or shorted.
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)-2, Basic Diagnostic Procedure.>
Is there any fault in LAN sys-
tem?
2
CHECK POOR CONTACT OF CONNEC-
TORS.
Is there poor contact of
VDCCM&H/U connector?
Repair the connec-
tor.
3
CHECK OUTPUT OF STEERING ANGLE
SENSOR WITH SUBARU SELECT MONI-
TOR.
1) Select “Current Data Display & Save” on the
Subaru Select Monitor. <Ref. to VDC(diag)-19,
READ CURRENT DATA, OPERATION, Subaru
Select Monitor.>
2) Check the «Steer Angle Sensor Op».
Does the output signal change? Go to step
4
CHECK OUTPUT OF YAW RATE & G SEN-
SOR WITH SUBARU SELECT MONITOR.
1) Select “Current Data Display & Save” on the
Subaru Select Monitor. <Ref. to VDC(diag)-19,
READ CURRENT DATA, OPERATION, Subaru
Select Monitor.>
2) Check the «Yaw Rate Sensor Output».
Does the output signal change? Go to step
5
CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-27,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-26, Inspection Mode.>
4) Read the DTC.
Is the same DTC displayed?
Temporary poor
contact occurs.
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