Subaru Legacy IV (2008 year). Manual - part 946
VDC(diag)-99
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 memorized.
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 operating the brake
pedal, does the pressure sen-
sor output value on the display
change according to the brake
pedal operation?
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)-23,
Clear Memory Mode.>
2) Perform the Inspection Mode. <Ref. to
VDC(diag)-22, 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)-34, List
of Diagnostic Trou-
ble Code (DTC).>
It results from a
temporary noise
interference.