Subaru Legacy (2005 year). Service manual — part 788

VDC(diag)-17

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Subaru Select Monitor

etc.) on the occurrence of a problem, the DTC
which is suffixed with a question mark “?” appears
on the Subaru Select Monitor display. This shows it
may be an unreliable reading.
10) If VDC and Subaru Select Monitor cannot com-
municate, check the communication circuit. <Ref.
to VDC(diag)-20, COMMUNICATION FOR INI-
TIALIZING IMPOSSIBLE, INSPECTION, Subaru
Select Monitor.>

Display

Contents to be monitored

Current

Indicate the latest DTC on the Subaru
Select Monitor display.

Old

Indicate the latest DTC in previous trou-
ble on the Subaru Select Monitor display.

Older

Indicate the latest DTC in second previ-
ous trouble on the Subaru Select Monitor
display.

Before 3

Indicate the latest DTC in third previous
trouble on the Subaru Select Monitor dis-
play.

VDC(diag)-18

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Subaru Select Monitor

2. READ CURRENT DATA

1) On the «Main Menu» display screen, select the {Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display screen, select the {Brake Control} and press the [YES] key.
3) Press the [YES] key after the {VDC} is displayed.
4) On the «Brake Control Diagnosis» display screen, select the {Current Data Display/Save}, and then press
the [YES] key.
5) On the «Data Display Menu» display screen, select the data display method, and press the [YES] key.
6) Using a scroll key, scroll the display screen up or down until necessary data is shown.
• A list of the support data is shown in the following table.

NOTE:
For details concerning operation procedure, refer to the SUBARU SELECT MONITOR OPERATION MAN-
UAL.

Display

Contents to be monitored

Unit of measure

FR Wheel Speed

Wheel speed detected by front ABS wheel speed sensor RH is dis-
played.

km/h or MPH

FL Wheel Speed

Wheel speed detected by front ABS wheel speed sensor LH is dis-
played.

km/h or MPH

RR Wheel Speed

Wheel speed detected by rear ABS wheel speed sensor RH is dis-
played.

km/h or MPH

RL Wheel Speed

Wheel speed detected by rear ABS wheel speed sensor LH is dis-
played.

km/h or MPH

Steering Angle Sensor

Steering angle detected by steering angle sensor is displayed.

deg

Yaw Rate Sensor

Vehicle angular speed detected by yaw rate sensor is displayed.

deg/s

Pressure Sensor

Brake fluid pressure detected by pressure sensor is displayed.

bar

Lateral G Sensor

Vehicle lateral acceleration detected by lateral G sensor is dis-
played.

m/s (m/s

2

)

IG power supply voltage

Voltage supplied to VDCCM&H/U is displayed.

V

EAM signal

Engine control command signal is displayed.

1 or 0

TCS Operation Light

TCS operation condition is displayed.

ON or OFF

VDC Operation Light

VDC operation condition is displayed.

ON or OFF

VDC OFF Light

ON/OFF condition of VDC OFF indicator light is displayed.

ON or OFF

EBD Warning Light

ON operation of the EBD warning light is displayed.

ON or OFF

ABS Warning Light

ON operation of the ABS warning light is displayed.

ON or OFF

VDC Warning Light

ON operation of the VDC warning light is displayed.

ON or OFF

VDC OK-B signal

Malfunction of VDC sensor (except for vehicle speed sensor) is
displayed.

1 or 0

Valve Relay Signal

Valve relay operation signal is displayed.

ON or OFF

Motor Relay Signal

Motor relay operation signal is displayed.

ON or OFF

Motor Relay Monitor

Motor relay monitor signal is displayed.

ON or OFF

PATA Signal

Operation condition of VDC OFF switch is displayed.

ON or OFF

BLS Signal

Brake ON/OFF is displayed.

ON or OFF

Gear position

Present gear position is displayed.

—

Engine Speed

Current engine speed is displayed.

rpm

PW Signal

Acceleration opening is displayed.

%

VDC(diag)-19

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Subaru Select Monitor

3. CLEAR MEMORY MODE

1) On the «Main Menu» display screen, select the
{2. Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display
screen, select the {Brake Control} and press the
[YES] key.
3) Press the [YES] key after the {VDC} is displayed.
4) On the «Brake Control Diagnosis» display
screen, select the {Clear Memory} and press the
[YES] key.

5) When “Done” and “Turn ignition switch OFF” are
shown on the display screen, turn the Subaru Se-
lect Monitor power switch and ignition switch to
OFF.

NOTE:
For details concerning operation procedure, refer
to the SUBARU SELECT MONITOR OPERATION
MANUAL.

4. ABS SEQUENCE CONTROL

5. FREEZE FRAME DATA

NOTE:
• Data stored at the time of trouble occurrence is
shown on display.
• Each time trouble occurs, the latest information
is stored in the freeze frame data in memory.
• If a freeze frame data is not properly stored in
memory (due to a drop in VDC control module pow-
er supply, etc.), the DTC which is suffixed with a
question mark “?” appears on the Subaru Select
Monitor display. This shows it may be an unreliable
reading.

Display

Contents to be monitored

Clear Memory?

DTC deleting function

Display

Contents to be monitored

Reference tar-

get

ABS
sequence
control

Operate the valve and
pump motor continuously
to perform the ABS
sequence control.

<Ref. to ABS-
10, ABS
Sequence Con-
trol.>

VDC confir-
mation
mode

Operate the valve and
pump motor continuously
to perform the VDC
sequence control.

<Ref. to VDC-
12, VDC
Sequence Con-
trol.>

Display

Contents to be monitored

Steering angle
sensor

Steering angle detected by steering
angle sensor is displayed.

Yaw rate sensor

Vehicle angular speed detected by yaw
rate sensor is displayed.

Lateral G sensor

Vehicle lateral acceleration detected by
lateral G sensor is displayed.

Pressure sensor

Brake fluid pressure detected by pres-
sure sensor is displayed.

Vehicle Speed

Vehicle speed calculated by VDC control
module is displayed.

FR Wheel
Speed

Wheel speed detected by front ABS
wheel speed sensor RH is displayed in
km/h or MPH.

FL Wheel Speed

Wheel speed detected by front ABS
wheel speed sensor LH is displayed in
km/h or MPH.

RR Wheel
Speed

Wheel speed detected by rear ABS
wheel speed sensor RH is displayed in
km/h or MPH.

RL Wheel
Speed

Wheel speed detected by rear ABS
wheel speed sensor LH is displayed in
km/h or MPH.

Required torque

Engine required torque is displayed.

Current torque

Current engine torque on malfunction
occurrence is displayed.

Target torque

Engine target torque is displayed.

PW signal

Acceleration opening is displayed.

Engine Speed

Engine speed on malfunction occur-
rence is displayed.

Gear position

Gear position on malfunction occurrence
is displayed.

IG power supply
voltage

Voltage supplied to VDC control module
is displayed.

Absolute angle
recognition flag

Whether the absolute angle was deter-
mined is displayed.

Decreasing
required torque

Whether the torque decrease is required
to engine is displayed.

EAM signal

Engine control command signal is dis-
played.

VDC O control
flag

VDC oversteer control condition is dis-
played.

VDC U control
flag

VDC understeer control condition is dis-
played.

BMR control flag

Brake control condition is displayed.

AMR control flag

Engine control condition is displayed.

ABS control flag

ABS control condition is displayed.

VDC OFF light

ON/OFF condition of VDC OFF indicator
light is displayed.

Valve Relay Sig-
nal

Valve relay operation signal is displayed.

Motor Relay
Monitor

Motor relay monitor signal is displayed.

BLS signal

Brake ON/OFF is displayed.

VDC(diag)-20

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)

Subaru Select Monitor

B: INSPECTION

1. COMMUNICATION FOR INITIALIZING IMPOSSIBLE

DETECTING CONDITION:
Defective harness connector
TROUBLE SYMPTOM:
Communication is impossible between VDC and Subaru Select Monitor.
WIRING DIAGRAM:

VDC00297

MAIN SBF

SBF-6

No.33

B310

E

E

26

6

14

VDCCM & H/U

B310

B40

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

1 2 3 4

11 12 13 14
27 28 29 30

15 16 17 18
31 32 33 34

19 20 21 22
35 36 37 38

23 24 25 26
39 40 41 42

5

6

7

8

9

10

BATTERY

IGNITION
SWITCH

DATA LINK
CONNECTOR

B40

10

1