Subaru 2009 IMPREZA Service Manual page 2537

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
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.
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.
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.
4 CHECK OUTPUT OF LONGITUDINAL G
SENSOR USING SUBARU SELECT MONI-
TOR.
Read the indication of longitudinal G sensor
output.
5 CHECK POOR CONTACT OF CONNECTOR.
Turn the ignition switch to OFF.
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.
7 CHECK OTHER DTC DETECTION.
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Check
Did the wheels turn freely?
Is the indicated reading on the
monitor display –1.2 — 1.2 m/s
When the yaw rate & G sensor is
inclined 90° to the front, is the
indicated value 6.8 — 12.8 m/s
When the yaw rate & G sensor is
inclined 90° to the rear, is the indi-
cated value –6.8 — –12.8 m/s
Is there poor contact of connec-
tor between VDCCM&H/U and
yaw rate & G sensor?
Is the same DTC displayed?
Is any other DTC displayed?
VDC(diag)-75
Yes
VDC is normal. Go to step 2.
Clear the memory.
Go to step 3. Replace the yaw
2
? rate & G sensor.
<Ref. to VDC-16,
Yaw Rate and G
Sensor.>
Go to step 4. Replace the yaw
rate & G sensor.
2
? <Ref. to VDC-16,
Yaw Rate and G
Sensor.>
Go to step 5. Replace the yaw
rate & G sensor.
2
? <Ref. to VDC-16,
Yaw Rate and G
Sensor.>
Repair the connec- Go to step 6.
tor.
Replace the Go to step 7.
VDCCM only.
<Ref. to VDC-9,
REPLACEMENT,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
Perform the diag- Temporary poor
nosis according to contact occurs.
DTC. <Ref. to
VDC(diag)-33, List
of Diagnostic Trou-
ble Code (DTC).>
No