Subaru 2009 IMPREZA, Service Manual

Page: 2515 / 3619

VDC(diag)-53
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step Check Yes No
1 CHECK VDCCM&H/U GROUND CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the
VDCCM&H/U.
3) Measure the resistance between
VDCCM&H/U and chassis ground.
Connector & terminal
(B310) No. 25 — Chassis ground:
Is the resistance less than 0.5
:
? Go to step 2 . Repair the
VDCCM&H/U
ground harness.
2 CHECK POOR CONTACT OF CONNEC-
TORS. Is there poor contact of the con-
nector between the battery, igni-
tion switch and VDCCM&H/U? Repair the connec-
tor. Go to step 3 .
3 CHECK CAUSE OF SIGNAL NOISE. Are the radio wave devices and
electronic components
installed correctly? Go to step 4 . Install the radio
wave devices and
electronic compo-
nents properly.
4 CHECK CAUSE OF SIGNAL NOISE. Is there a noise source (such as
an antenna) installed near the
sensor harness? Install the noise
source apart from
the sensor har-
ness. Go to step 5 .
5 CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-24,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-23, Inspection Mode.>
4) Read the DTC.
Is the same DTC displayed? Replace the
VDCCM only.
<Ref. to VDC-9,
REPLACEMENT,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).> Go to step 6 .
6 CHECK OTHER DTC DETECTION. Is any other DTC displayed? Perform the diag-
nosis according to
DTC. <Ref. to
VDC(diag)-33, List
of Diagnostic Trou-
ble Code (DTC).> Temporary poor
contact occurs.