Subaru 2009 IMPREZA Service Manual page 2553

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
3 CHECK POWER SUPPLY OF YAW RATE & G
SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from yaw rate & G
sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between yaw rate & G
sensor and chassis ground.
Connector & terminal
(B230) No. 1 (+) — Chassis ground (–):
4 CHECK YAW RATE & G SENSOR GROUND
CIRCUIT.
Measure the resistance between yaw rate & G
sensor and chassis ground.
Connector & terminal
(B230) No. 4 — Chassis ground:
5 CHECK OUTPUT OF YAW RATE & G SEN-
SOR WITH SUBARU SELECT MONITOR.
1) Drive the vehicle on a flat road.
2) Park the vehicle straight.
3) Select {Current Data Display & Save} in
Subaru Select Monitor.
4) Read the yaw rate output displayed on dis-
play.
6 CHECK YAW RATE & G SENSOR.
1) Turn the ignition switch to OFF.
2) Connect all connectors.
3) Clear the memory. <Ref. to VDC(diag)-24,
Clear Memory Mode.>
4) Perform the Inspection Mode. <Ref. to
VDC(diag)-23, Inspection Mode.>
5) Read the DTC.
7 CHECK VDCCM&H/U.
1) Turn the ignition switch to OFF.
2) Replace the yaw rate & G sensor. <Ref. to
VDC-16, Yaw Rate and G Sensor.>
3) Clear the memory. <Ref. to VDC(diag)-24,
Clear Memory Mode.>
4) Perform the Inspection Mode. <Ref. to
VDC(diag)-23, Inspection Mode.>
5) Read the DTC.
8 CHECK OTHER DTC DETECTION.
9 CHECK OTHER DTC DETECTION.
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Check
Is the voltage 10 — 15 V?
Is the resistance less than 0.5 ? Go to step 5.
Is the reading indicated on
monitor display –4 — 4 deg/s?
Is the same DTC displayed?
Is the same DTC displayed?
Is any other DTC displayed?
Is any other DTC displayed?
VDC(diag)-91
Yes No
Go to step 4. Repair the yaw rate
& G sensor power
supply circuit.
Repair the yaw rate
& G sensor ground
circuit.
Go to step 6. Replace the yaw
rate & G sensor.
<Ref. to VDC-16,
Yaw Rate and G
Sensor.>
Go to step 7. Go to step 8.
Replace the Go to step 9.
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).>
Perform the diag- Malfunction is
nosis according to found in original
DTC. <Ref. to yaw rate & G sen-
VDC(diag)-33, List sor.
of Diagnostic Trou-
ble Code (DTC).>