Subaru 2009 IMPREZA, Service Manual

Page: 2537 / 3619

VDC(diag)-75
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step Check Yes No
1 WHETHER A WHEEL TURNED FREELY OR
NOT.
Check if the wheels have been turned freely for
one minute or more, such as when the vehicle is
jacked-up, under full-lock cornering or when the
wheels are not in contact with road surface.
Did the wheels turn freely? VDC is normal.
Clear the memory. Go to step 2 .
2 CHECK OUTPUT OF LONGITUDINAL G
SENSOR USING SUBARU SELECT MONI-
TOR.
1) Park the vehicle on a level surface.
2) Select {Current Data Display & Save} in
Subaru Select Monitor.
3) Read the indication of longitudinal G sensor
output.
Is the indicated reading on the
monitor display –1.2 — 1.2 m/s
2
?
Go to step 3 . Replace the yaw
rate & G sensor.
<Ref. to VDC-16,
Yaw Rate and G
Sensor.>
3 CHECK OUTPUT OF LONGITUDINAL G
SENSOR USING SUBARU SELECT MONI-
TOR.
1) Turn the ignition switch to OFF.
2) Remove the yaw rate & G sensors from
vehicle.
3) Turn the ignition switch to ON, and select the
{Current Data Display & Save} in Subaru Select
Monitor.
4) Read the indication of longitudinal G sensor
output.
When the yaw rate & G sensor is
inclined 90° to the front, is the
indicated value 6.8 — 12.8 m/s
2
?
Go to step 4 . Replace the yaw
rate & G sensor.
<Ref. to VDC-16,
Yaw Rate and G
Sensor.>
4 CHECK OUTPUT OF LONGITUDINAL G
SENSOR USING SUBARU SELECT MONI-
TOR.
Read the indication of longitudinal G sensor
output.
When the yaw rate & G sensor is
inclined 90° to the rear, is the indi-
cated value –6.8 — –12.8 m/s
2
?
Go to step 5 . Replace the yaw
rate & G sensor.
<Ref. to VDC-16,
Yaw Rate and G
Sensor.>
5 CHECK POOR CONTACT OF CONNECTOR.
Turn the ignition switch to OFF.
Is there poor contact of connec-
tor between VDCCM&H/U and
yaw rate & G sensor? Repair the connec-
tor. Go to step 6 .
6 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 7 .
7 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.