Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 525

VDC-29

VDC OFF Switch

VEHICLE DYNAMICS CONTROL (VDC)

12.VDC OFF Switch

A: REMOVAL

1) Remove the instrument panel lower cover. <Ref.

to EI-49, REMOVAL, Instrument Panel Lower Cov-

er.>

2) Remove the screws, and then remove the VDC

OFF switch.

B: INSTALLATION

Install each part in the reverse order of removal.

C: INSPECTION

1) Check the resistance between the VDC OFF

switch terminals.

2) Replace the VDC OFF switch if the inspection

result is not within the standard value.

Switch position

Terminal No.

Standard

OFF

2 — 3

1 MΩ or more

ON

2 — 3

Less than 1 Ω

VDC00541

4 3 2 1

VDC-30

VDC OFF Switch

VEHICLE DYNAMICS CONTROL (VDC)

VEHICLE DYNAMICS CONTROL (VDC) (DI-

AGNOSTICS)

VDC(diag)

Page

1.

Basic Diagnostic Procedure . . . . . . . . . . . . . . . . . ...2

2.

Check List for Interview . . . . . . . . . . . . . . . . . . . ..4

3.

General Description . . . . . . . . . . . . . . . . . . . . .10

4.

Electrical Component Location . . . . . . . . . . . . . . . . 12

5.

Control Module I/O Signal . . . . . . . . . . . . . . . . . . 14

6.

Subaru Select Monitor . . . . . . . . . . . . . . . . . . . ..18

7.

Read Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . .25

8.

Inspection Mode . . . . . . . . . . . . . . . . . . . . . ...26

9.

Clear Memory Mode . . . . . . . . . . . . . . . . . . . . .27

10.

Warning Light Illumination Pattern . . . . . . . . . . . . . . ...28

11.

List of Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . 48

12.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) . . . . . 53

13.

General Diagnostic Table . . . . . . . . . . . . . . . . . ...110

VDC(diag)-2

Basic Diagnostic Procedure

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

1. Basic Diagnostic Procedure

A: PROCEDURE

CAUTION:

Remove foreign matter (dust, water, oil etc.) from the VDCCM&H/U connector during removal and in-

stallation.
NOTE:

• To check the harness for open or short circuits, shake problem spot or connector.

• Refer to “Check List for Interview”. <Ref. to VDC(diag)-4, Check List for Interview.>

Step

Check

Yes

No

1

CHECK PRE-INSPECTION.
1) Ask the customer when and how the trouble
occurred using the interview check list. <Ref. to
VDC(diag)-4, Check List for Interview.>
2) Before performing diagnostics, check the
component which might affect VDC problems.
<Ref. to VDC(diag)-10, INSPECTION, General
Description.>

Is the component that might
influence the VDC problem nor-
mal?

Go to step

2.

Repair or replace
each component.

2

CHECK INDICATION OF DTC.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to data
link connector.
3) Turn the ignition switch to ON and run the
Subaru Select Monitor.
4) Read the DTC using the Subaru Select
Monitor. <Ref. to VDC(diag)-25, OPERATION,
Read Diagnostic Trouble Code (DTC).>
NOTE:

If the communication function of the Subaru Se-
lect Monitor cannot be executed properly,
check the communication circuit. <Ref. to
VDC(diag)-22, COMMUNICATION FOR INI-
TIALIZING IMPOSSIBLE, INSPECTION, Sub-
aru Select Monitor.>

Is DTC displayed on Subaru
Select Monitor?

Record the DTC.
Go to step

4.

Go to step

3.

3

PERFORM GENERAL DIAGNOSTICS.
1) Perform the inspection by referring to “Gen-
eral Diagnostic Table”. <Ref. to VDC(diag)-110,
INSPECTION, General Diagnostic Table.>
2) Perform the Clear Memory Mode. <Ref. to
VDC(diag)-27, OPERATION, Clear Memory
Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-26, PROCEDURE, Inspection
Mode.>
4) Read the DTC. <Ref. to VDC(diag)-25,
OPERATION, Read Diagnostic Trouble Code
(DTC).>
5) Check the DTC is not displayed.

Do the VDC warning light and
ABS warning light go off after
starting the engine?

Finish the diagno-
sis.

Check the combi-
nation meter cir-
cuit. <Ref. to
VDC(diag)-34,
ABS WARNING
LIGHT DOES NOT
GO OFF, Warning
Light Illumination
Pattern.> <Ref. to
VDC(diag)-38,
VDC WARNING
LIGHT AND VDC
INDICATOR
LIGHT DO NOT
GO OFF, Warning
Light Illumination
Pattern.>

4

CHECK FREEZE FRAME DATA.
Using the Subaru Select Monitor, check the
freeze frame data of the VDC control module.

Are freeze frame data
recorded?

Record the freeze
frame data. Go to
step

5.

Go to step

5.