Subaru Legacy III (2000-2003 year). Service manual — part 742

VDC-4

VDC (DIAGNOSTICS)

BASIC DIAGNOSTIC PROCEDURE

2. WITH SUBARU SELECT MONITOR

Step

Value

Yes

No

1

CHECK PRE-INSPECTION.
1) Ask the customer when and how the trou-

ble occurred using interview checklist.
<Ref. to VDC-6, Check List for Interview.>

2) Before performing diagnosis, inspect unit

which might influence the VDC problem.
<Ref. to VDC-9, INSPECTION, General
Description.>
Is unit that might influence the VDC prob-
lem normal?

Normal

Go to step 2.

Repair or replace
each unit.

2

CHECK INDICATION OF TROUBLE CODE
DISPLAY.
1) Turn ignition switch to OFF.
2) Connect the SUBARU SELECT MONITOR

to data link connector.

3) Turn ignition switch to ON and SUBARU

SELECT MONITOR to ON.

4) Calling up the diagnostic trouble code

(DTC). <Ref. to VDC-23, WITH SUBARU
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>

5) Record all diagnostic trouble codes (DTCs)

and frame data.
Is diagnostic trouble code (DTC) is dis-
played?

DTC is indicated.

Go to step 3.

Go to step 5.

3

CHECK WARNING LIGHT.
Check lighting pattern of the warning light.
<Ref. to VDC-26, INSPECTION, Warning Light
Illumination Pattern.>
Is the warning light lighting pattern normal?

Normal

Go to step 4.

Check warning
light. <Ref. to
VDC-33, ABS
WARNING LIGHT,
VDC WARNING
LIGHT, VDC
OPERATING
INDICATOR
LIGHT OR VDC
OFF INDICATOR
LIGHT DOES
NOT COME ON.,
Diagnostics Chart
with Diagnosis
Connector.>

4

PERFORM THE GENERAL DIAGNOSTICS.
1) Inspect using “General Diagnostics Table”.

<Ref. to VDC-275, INSPECTION, General
Diagnostic Table.>

2) Perform the clear memory mode. <Ref. to

VDC-25, WITH SUBARU SELECT MONI-
TOR, OPERATION, Clear Memory Mode.>

3) Perform the inspection mode. <Ref. to

VDC-24, OPERATION, Inspection Mode.>

4) Calling up the diagnostic trouble code

(DTC). <Ref. to VDC-23, WITH SUBARU
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>
Is no diagnostic trouble code (DTC) dis-
played or do VDC and ABS warning lights
constantly remain on?

DTC is indicated.

Complete the
diagnosis.

Go to step 5.

VDC-5

VDC (DIAGNOSTICS)

BASIC DIAGNOSTIC PROCEDURE

NOTE:
• To check harness for broken wires or short circuits, shake it while holding it or the connector.
• Check list for interview. <Ref. to VDC-6, Check List for Interview.>

5

PERFORM THE DIAGNOSIS.
1) Inspect using “Diagnostics Chart with Sub-

aru Select Monitor”.<Ref. to VDC-130,
Diagnostics Chart with Select Monitor.>

NOTE:

For diagnostic trouble code (DTC) list, refer to
“List of Diagnostic Trouble Code (DTC)”. <Ref.
to VDC-29, WITH SUBARU SELECT MONI-
TOR, LIST, List of Diagnostic Trouble Code
(DTC).>

2) Repair trouble cause.
3) Perform the clear memory mode. <Ref. to

VDC-25, WITH SUBARU SELECT MONI-
TOR, OPERATION, Clear Memory Mode.>

4) Perform the inspection mode. <Ref. to

VDC-24, OPERATION, Inspection Mode.>

5) Calling up the diagnostic trouble code

(DTC). <Ref. to VDC-23, WITH SUBARU
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>
Is diagnostic trouble code (DTC) dis-
played?

DTC is indicated.

Inspect using
“Diagnostics Chart
with Subaru Select
Monitor”. <Ref. to
VDC-130, Diag-
nostics Chart with
Select Monitor.>

Complete the
diagnosis.

Step

Value

Yes

No

VDC-6

VDC (DIAGNOSTICS)

CHECK LIST FOR INTERVIEW

2. Check List for Interview

A: CHECK

Check the following items about the vehicle's state.
1. STATE OF ABS AND/OR VDC WARNING LIGHT

2. STATE OF VDC OFF INDICATOR LIGHT

ABS and/or VDC
warning light comes
on.

❏

Always

❏

Sometimes

❏

Only once

❏

Does not come on

• When / how long does it come on?:

Ignition key position

❏

LOCK

❏

ACC

❏

ON (before starting engine)

❏

START

❏

On after starting (Engine running)

Timing

❏

Immediately after ignition is ON.

❏

Immediately after ignition starts.

❏

When advancing

km/h to

km/h

MPH to

MPH

❏

While traveling at a constant speed

km/h

MPH

❏

When decelerating

km/h to

km/h

MPH to

MPH

❏

When turning to right

Steering angle :

deg

Steering time :

sec

❏

When turning to left

Steering angle :

deg

Steering time :

sec

❏

When moving other electrical parts

• Parts name :
• Operating condition :

VDC OFF indicator
light comes on.

❏

Always

❏

Sometimes

❏

Only once

❏

Does not come on

• When / how long does it come on?:

Ignition key position

❏

LOCK

❏

ACC

❏

ON (before starting engine)

❏

START

❏

On after starting (Engine is running)

❏

On after starting (Engine is stop)

Timing

❏

Immediately after ignition is ON.

❏

Immediately after ignition starts.

❏

When advancing

km/h to

km/h

MPH to

MPH

❏

While traveling at a constant speed

km/h

MPH

❏

When decelerating

km/h to

km/h

MPH to

MPH

❏

When turning to right

Steering angle :

deg

Steering time :

sec

❏

When turning to left

Steering angle :

deg

Steering time :

sec

❏

When moving other electrical parts

• Parts name :
• Operating condition :

VDC-7

VDC (DIAGNOSTICS)

CHECK LIST FOR INTERVIEW

3. STATE OF VDC OPERATION INDICATOR LIGHT

4. CONDITIONS UNDER WHICH TROUBLE OCCURS

VDC operation indi-
cator light comes on.

❏

Always

❏

Sometimes

❏

Only once

❏

Does not come on

• When / how long does it come on?:

Ignition key position

❏

LOCK

❏

ACC

❏

ON (before starting engine)

❏

START

❏

On after starting (Engine running)

❏

On after starting (Engine stopped)

Timing

❏

Immediately after ignition is ON.

❏

Immediately after ignition starts.

❏

When advancing

km/h to

km/h

MPH to

MPH

❏

While traveling at a constant speed

km/h

MPH

❏

When decelerating

km/h to

km/h

MPH to

MPH

❏

When turning to right

Steering angle :

deg

Steering time :

sec

❏

When turning to left

Steering angle :

deg

Steering time :

sec

❏

When moving other electrical parts

• Parts name :
• Operating condition :

Environment

a) Weather

❏

Fine

❏

Cloudy

❏

Rainy

❏

Snowy

❏

Various/Others :

b) Ambient temperature

°

C (

°

F)

c) Road

❏

Urban area

❏

Suburbs

❏

Highway

❏

General road

❏

Ascending slope

❏

Descending slope

❏

Paved road

❏

Gravel road

❏

Muddy road

❏

Sandy place

❏

Straight

❏

Sharp curve

❏

Slow curve

❏

S-shaped curve

❏

Road with inclination on each side

❏

Others :

d) Road surface

❏

Dry

❏

Wet

❏

New-fallen snow

❏

Compressed snow

❏

Frozen slope

❏

Others :