Subaru 2009 IMPREZA Service Manual page 2554

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AU:DTC C0072 YAW RATE SENSOR COMMUNICATION
DTC DETECTING CONDITION:
Communication failure between yaw rate sensor and VDCCM
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
WIRING DIAGRAM:
B231
1 2 3 4
Step
1 CHECK POWER SUPPLY FOR 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 (–):
B310 VDCCM & H/U
TWISTED PAIR LINE
B231
STEERING
YAW RATE &
ANGLE G SENSOR
SENSOR
B230
B230
1
2
3
4
Is the voltage 10 — 15 V?
VDC(diag)-92
MAIN SBF
IGNITION SWITCH
E
B310
1 2 3 4 5 6 7 8 9
22 23 24 25
26 27 28 29 30 31 32 33 34 35 36
Check
Go to step 2.
BATTERY
E
10 11 12 13 14 15 16 17 18 19 20 21
37 38 39 40 41 42 43 44 45 46
VDC00690
Yes No
Repair the yaw rate
& G sensor power
supply circuit.