Subaru 2009 IMPREZA, Service Manual

Page: 2559 / 3619

VDC(diag)-97
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AZ:DTC C0074 PRESSURE SENSOR
DTC DETECTING CONDITION:
Defective pressure sensor
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
Step Check Yes No
1 CHECK STOP LIGHT SWITCH CIRCUIT.
Check stop light switch open circuit.
Is the stop light switch circuit
OK? Go to step 2 . Repair the stop
light switch circuit.
NOTE:
If there is malfunc-
tion in the stop light
circuit, DTC may
be recorded in the
memory.
2 CHECK OUTPUT OF PRESSURE SENSOR
WITH SUBARU SELECT MONITOR.
1) Select {Current Data Display & Save} in
Subaru Select Monitor.
2) Read the pressure sensor output displayed
on display.
When the brake pedal is
released, is the displayed value
–40 — 40 bar? Go to step 3 . Replace the
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
3 CHECK OUTPUT OF PRESSURE SENSOR
WITH SUBARU SELECT MONITOR.
1) Select {Current Data Display & Save} in
Subaru Select Monitor.
2) Read the pressure sensor output displayed
on display.
When the brake pedal is oper-
ated, does the pressure sensor
output value displayed on the
screen change in accordance
with the brake pedal? Go to step 4 . Replace the
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
4 CHECK PRESSURE SENSOR.
1) Clear the memory. <Ref. to VDC(diag)-24,
Clear Memory Mode.>
2) Perform the Inspection Mode. <Ref. to
VDC(diag)-23, Inspection Mode.>
3) Read the DTC.
Is the same DTC displayed? Replace the
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).> Go to step 5 .
5 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).> It results from a
temporary noise
interference.