Subaru Legacy IV (2008 year). Service manual — part 922
VDC(diag)-3
Basic Diagnostic Procedure
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
4
PERFORM DIAGNOSIS.
1) Refer to “List of Diagnostic Trouble Code
(DTC)”.
NOTE:
For the DTC list, refer to “List of Diagnostic
Trouble Code (DTC)”. <Ref. to VDC(diag)-34,
LIST, List of Diagnostic Trouble Code (DTC).>
2) Correct the cause of trouble.
3) Perform the Clear Memory Mode. <Ref. to
VDC(diag)-23, OPERATION, Clear Memory
Mode.>
4) Perform the Inspection Mode. <Ref. to
VDC(diag)-22, PROCEDURE, Inspection
Mode.>
5) Read the DTC. <Ref. to VDC(diag)-21,
OPERATION, Read Diagnostic Trouble Code
(DTC).>
Is DTC displayed?
Repeat step 4 until
DTC is not shown.
Finish the diagno-
sis.
Step
Check
Yes
No
VDC(diag)-4
Check List for Interview
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
2. Check List for Interview
A: CHECK
Check the following item about the vehicle’s state.
1. STATE OF ABS WARNING LIGHT
ABS warning light
illuminates.
Always
Sometimes
Only once
Does not come on
• When/How long does it illuminate?
Ignition key position
LOCK
ACC
ON (before starting engine)
START
ON (after starting engine, engine is running)
ON (after starting engine, engine is at a standstill)
Timing
Immediately after turning the ignition switch to ON
Immediately after turning the ignition switch to START
While accelerating
—
km/h
—
MPH
While driving at a constant speed
km/h
MPH
While decelerating
—
km/h
—
MPH
When turning to the right
Steering angle:
deg
Steering time:
Sec.
When turning to the left
Steering angle:
deg
Steering time:
Sec.
When other electrical parts are operating
• Part name:
• Operating condition:
VDC(diag)-5
Check List for Interview
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
2. STATE OF VDC WARNING LIGHT AND VDC OFF INDICATOR LIGHT
3. STATE OF VDC INDICATOR LIGHT
VDC warning light
and VDC OFF indi-
cator light illuminate.
Always
Sometimes
Only once
Does not come on
• When/How long does it illuminate?
Ignition key position
LOCK
ACC
ON (before starting engine)
START
ON (after starting engine, engine is running)
ON (after starting engine, engine is at a standstill)
Timing
Immediately after turning the ignition switch to ON
Immediately after turning the ignition switch to START
While accelerating
—
km/h
—
MPH
While driving at a constant speed
km/h
MPH
While decelerating
—
km/h
—
MPH
When turning to the right
Steering angle:
deg
Steering time:
Sec.
When turning to the left
Steering angle:
deg
Steering time:
Sec.
When other electrical parts are operating
• Part name:
• Operating condition:
VDC operation indi-
cator light illuminate.
Always
Sometimes
Only once
Does not come on
• When/How long does it illuminate?
Ignition key position
LOCK
ACC
ON (before starting engine)
START
ON (after starting engine, engine is running)
ON (after starting engine, engine is at a standstill)
Timing
Immediately after turning the ignition switch to ON
Immediately after turning the ignition switch to START
While accelerating
—
km/h
—
MPH
While driving at a constant speed
km/h
MPH
While decelerating
—
km/h
—
MPH
When turning to the right
Steering angle:
deg
Steering time:
Sec.
When turning to the left
Steering angle:
deg
Steering time:
Sec.
When other electrical parts are operating
• Part name:
• Operating condition:
VDC(diag)-6
Check List for Interview
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
4. CONDITIONS UNDER WHICH TROUBLE OCCURS
Environment
a) Weather
Fine
Cloudy
Rainy
Snowy
Others:
b) Ambient temperature
°C (°F)
c) Road
Inner city
Suburbs
Highway
Local street
Uphill
Downhill
Paved road
Gravel road
Muddy road
Sandy place
Straight road
Sharp curve
Gentle curve
S-curve
Road with a slope on both sides
Others:
d) Road surface
Dry
Wet
Covered with fresh snow
Covered with hardened snow
Frozen slope
Others:
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