2009 SUBARU TRIBECA ac 25 procedure

VDC(diag)-68
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AH:DTC C0056 G SENSOR OUTPUT SEIZURE
DTC DETECTING CONDITION:
Defective G sensor
TROUBLE SYMPTOM:
VDC does not operate.
AI: DTC C0056 G SENSOR SIGNAL MALFUNCTION
DTC DETECTING CONDITION:
Defective G sensor
TROUBLE SYMPTOM:
VDC does not operate.
Step Check Yes No
1CHECK G SENSOR OUTPUT.
1) Connect the Subaru Select Monitor to the
vehicle.
2) Select {Current Data Display & Save} in
Subaru Select Monitor.
3) Read the G sensor output when braking.
Do the values on the monitor
display change?
Go to step 2.Replace the yaw
rate & G sensor.
2CHECK THE VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
Is the same DTC displayed? Replace the
VDCCM&H/U.
Go to step 3.
3CHECK OTHER DTC DETECTION.Is any other DTC displayed? Perform the diag-
nosis according to
DTC.
Te m p o r a r y p o o r
contact occurs.
Step Check Yes No
1CHECK YAW RATE & G SENSOR INSTAL-
LATION.
Check the yaw rate & G sensor installation.
Are the yaw rate & G sensor
and bracket tightened to a
torque of 7.5 N·m (0.76 kgf-m,
5.5 ft-lb)?
Go to step 2.Tighten the yaw
rate & G sensor.
2CHECK G SENSOR OUTPUT.
1) Connect the Subaru Select Monitor to the
vehicle.
2) Select {Current Data Display & Save} in
Subaru Select Monitor.
3) Read the G sensor output displayed on
screen.
Is the value on the monitor dis-
play –1.5 — 1.5 m/s2?
Go to step 3.Replace the yaw
rate & G sensor.
3CHECK THE VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
Is the same DTC displayed? Replace the
VDCCM&H/U.
Go to step 4.
4CHECK OTHER DTC DETECTION.Is any other DTC displayed? Perform the diag-
nosis according to
DTC.
Te m p o r a r y p o o r
contact occurs.

VDC(diag)-69
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AJ:DTC C0056 YAW RATE & G SENSOR POWER SUPPLY VOLTAGE MAL-
FUNCTION
DTC DETECTING CONDITION:
Defective G sensor
TROUBLE SYMPTOM:
VDC does not operate.
WIRING DIAGRAM:
B310
12034
B359
E
3512
B310 VDCCM & H/U
TWISTED PAIR LINE
YAW RATE&G SENSOR
1234
1516171819202122232425262728293031323334353637383940414245464344568910 11 12 13 147
VDC00375
B359
12345
MAIN SBF
NO.33
E
BATTERY
IGNITIONSWITCH

VDC(diag)-70
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AK:DTC C0056 G SENSOR OUTPUT MALFUNCTION
DTC DETECTING CONDITION:
Defective G sensor
TROUBLE SYMPTOM:
VDC does not operate.
Step Check Yes No
1CHECK THE YAW RATE & G SENSOR POW-
ER SUPPLY.
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
(B359) No. 5 (+) — Chassis ground (–):
Is the voltage 10 — 15 V? Go to step 2.Replace the yaw
rate & G sensor
power supply cir-
cuit.
2CHECK GROUND CIRCUIT OF YAW RATE &
G SENSOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between the yaw
rate & G sensor and chassis ground.
Connector & terminal
(B359) No. 1 (+) — Chassis ground (–):
Is the resistance less than 0.5
Ω?
Go to step 3.Replace the yaw
rate & G sensor
power supply cir-
cuit.
3CHECK YAW RATE & G SENSOR.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
Is the same DTC displayed? Replace the
VDCCM&H/U.
Go to step 4.
4CHECK OTHER DTC DETECTION.Is any other DTC displayed? Perform the diag-
nosis according to
DTC.
Te m p o r a r y p o o r
contact occurs.
Step Check Yes No
1CHECK YAW RATE & G SENSOR INSTAL-
LATION.
Check the yaw rate & G sensor installation.
Are the yaw rate & G sensor
and bracket tightened to a
torque of 7.5 N·m (0.76 kgf-m,
5.5 ft-lb)?
Go to step 2.Tighten the yaw
rate & G sensor.
2CHECK G SENSOR OUTPUT.
1) Connect the Subaru Select Monitor to the
vehicle.
2) Select {Current Data Display & Save} in
Subaru Select Monitor.
3) Drive at a constant speed of approximately
40 km/h (25 MPH) and read the G sensor out-
put at that time.
Is the indicated reading on the
monitor display –1.5 — 1.5 m/
s2?
Go to step 3.Replace the yaw
rate & G sensor.
3CHECK THE VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
Is the same DTC displayed? Replace the
VDCCM&H/U.
Go to step 4.
4CHECK OTHER DTC DETECTION.Is any other DTC displayed? Perform the diag-
nosis according to
DTC.
Te m p o r a r y p o o r
contact occurs.

VDC(diag)-71
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AL:DTC C0057 ECM COMMUNICATION
DTC DETECTING CONDITION:
No CAN signal from ECM.
TROUBLE SYMPTOM:
VDC does not operate.
AM:DTC C0057 AT COMMUNICATION
DTC DETECTING CONDITION:
No CAN signal from TCM.
TROUBLE SYMPTOM:
•ABS does not operate.
•VDC does not operate.
Step Check Yes No
1CHECK LAN SYSTEM.
Perfor m the diagnosis for LAN system. LAN(diag)-25, OPERATION, Read Diagnostic
Tr o u b l e C o d e ( D T C ) . >
Is there any fault in LAN sys-
tem?
Pe r for m t h e d ia g -
nosis according to
DTC for LAN sys-
tem.
Go to step 2.
2CHECK POOR CONTACT OF CONNEC-
TORS.
Is there poor contact in ECM
connector?
Repair the con-
nector.
Go to step 3.
3CHECK ECM.Is ECM normal? Go to step 4.Replace the ECM.
4CHECK THE VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
Is the same DTC displayed? Replace the
VDCCM&H/U.
VDC Control Mod-
ule & Hydraulic
Control Unit
(VDCCM&H/U).>
Go to step 5.
5CHECK OTHER DTC DETECTION.Is any other DTC displayed? Perform the diag-
nosis according to
DTC.
Te m p o r a r y p o o r
contact occurs.
Step Check Yes No
1CHECK LAN SYSTEM.
Perfor m the diagnosis for LAN system. LAN(diag)-25, OPERATION, Read Diagnostic
Tr o u b l e C o d e ( D T C ) . >
Is there any fault in LAN sys-
tem?
Pe r for m t h e d ia g -
nosis according to
DTC for LAN sys-
tem.
Go to step 2.
2CHECK POOR CONTACT OF CONNEC-
TORS.
Is there poor contact in TCM
connector?
Repair the con-
nector.
Go to step 3.
3CHECK TCM.Is the TCM normal? Go to step 4.Replace the TCM.
Tr a n s m i s s i o n C o n -
trol Module
(TCM).>
4CHECK THE VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
Is the same DTC displayed? Replace the
VDCCM&H/U.
Go to step 5.
5CHECK OTHER DTC DETECTION.Is any other DTC displayed? Perform the diag-
nosis according to
DTC.
Te m p o r a r y p o o r
contact occurs.

VDC(diag)-72
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AN:DTC C0057 TRANSMISSION SYSTEM MALFUNCTION
DTC DETECTING CONDITION:
Transmission System Defect
TROUBLE SYMPTOM:
•ABS does not operate.
•VDC does not operate.
Step Check Yes No
1CHECK AT SYSTEM.
1) Start the engine.
2) Check the DTC in AT system.
Is DTC of AT system dis-
played?
Repair the AT sys-
tem.
Go to step 2.
2CHECK THE VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
Is the same DTC displayed? Replace the
VDCCM&H/U.
Go to step 3.
3CHECK OTHER DTC DETECTION.Is any other DTC displayed? Perform the diag-
nosis according to
DTC.
Te m p o r a r y p o o r
contact occurs.

VDC(diag)-73
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AO:DTC C0071 STEERING ANGLE SENSOR COMMUNICATION MALFUNCTION
DTC DETECTING CONDITION:
Defective steering angle sensor
TROUBLE SYMPTOM:
VDC does not operate.
WIRING DIAGRAM:
B310
1234
B231
12034
B231
E
241
3
B310 VDCCM & H/U
TWISTED PAIR LINE
STEERINGANGLESENSOR
1234
1516171819202122232425262728293031323334353637383940414245464344568910 11 12 13 147
VDC00376
MAIN SBF
NO.33
E
BATTERY
IGNITIONSWITCH

VDC(diag)-74
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step Check Yes No
1CHECK THE POWER SUPPLY OF THE
STEERING ANGLE SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from steering
angle sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between steering
angle sensor and chassis ground.
Connector & terminal
(B231) No. 4 (+) — Chassis ground (–):
Is the voltage 10 — 15 V? Go to step 2.Repair power sup-
ply circuit in the
steering angle
sensor.
2CHECK GROUND CIRCUIT OF STEERING
ANGLE SENSOR.
Measure the voltage between steering angle
sensor and chassis ground.
Connector & terminal
(B231) No. 3 (+) — Chassis ground (–):
Is the resistance less than 0.5
Ω?
Go to step 3.Repair ground cir-
cuit in the steering
angle sensor.
3CHECK POOR CONTACT OF CONNEC-
TORS.
Is there poor contact in con-
nector?
Correct or replace
the connector.
Go to step 4.
4CHECK STEERING ANGLE SENSOR.
1) Turn the ignition switch to OFF.
2) Connect all the connectors.
3) Erase the memory.
4) Perform the inspection mode.
5) Read the DTC.
Is the same DTC displayed? Replace the steer-
ing angle sensor.
Go to step 5.
5CHECK OTHER DTC DETECTION.Is any other DTC displayed? Perform the diag-
nosis according to
DTC.
Te m p o r a r y p o o r
contact occurs.

VDC(diag)-75
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AP:DTC C0071 DEFECTIVE STEERING ANGLE SENSOR COMMUNICATION
DTC DETECTING CONDITION:
Signal does not come from steering angle sensor.
TROUBLE SYMPTOM:
VDC does not operate.
WIRING DIAGRAM:
B310
1234
B231
12034
B231
E
241
3
B310 VDCCM & H/U
TWISTED PAIR LINE
STEERINGANGLESENSOR
1234
1516171819202122232425262728293031323334353637383940414245464344568910 11 12 13 147
VDC00376
MAIN SBF
NO.33
E
BATTERY
IGNITIONSWITCH