Subaru Legacy III (2000-2003 year). Service manual — part 739

VDC-24

VDC

YAW RATE AND LATERAL G SENSOR

5

CHECK YAW RATE AND LATERAL G SEN-
SOR.
1) Turn ignition switch to OFF.
2) Connect select monitor connector to data

link connector.

3) Turn ignition switch to ON.
4) Turn select monitor into {BRAKE CON-

TROL} mode.

5) Set the display in the {Current Data Display

& Save} mode.

6) Read the yaw rate and lateral G sensor out-

put voltage.

NOTE:

If the yaw rate and lateral G sensor is moved,
the VDC (Yaw rate sensor) may be stored into
the memory.

Is the indicated reading within the specified
range when the vehicle is in horizontal posi-
tion?

2.5

±

0.2 V

Go to step 6.

Replace yaw rate
and lateral G sen-
sor.

6

CHECK YAW RATE AND LATERAL G SEN-
SOR.
1) Remove console box.
2) Remove yaw rate and lateral G sensor from

vehicle. (Do not disconnect connector.)

3) Read the select monitor display.

NOTE:

If the yaw rate and lateral G sensor is moved,
the VDC (Yaw rate sensor) may be stored into
the memory.

Is the voltage within the specified range
when yaw rate and lateral G sensor is
inclined right to 90

°

?

3.5

±

0.2 V

Go to step 7.

Replace yaw rate
and lateral G sen-
sor.

7

CHECK YAW RATE AND LATERAL G SEN-
SOR.
Read the select monitor display.

NOTE:

If the yaw rate and lateral G sensor is moved,
the VDC (Yaw rate sensor) may be stored into
the memory.

Is the voltage within the specified range when
yaw rate and lateral G sensor is inclined left to
90

°

?

1.5

±

0.2 V

Yaw rate and lat-
eral G sensor is
normal.

Replace yaw rate
and lateral G sen-
sor.

Step

Value

Yes

No

VDC-25

VDC

YAW RATE AND LATERAL G SENSOR

2. YAW RATE SENSOR SIGNAL

Step

Value

Yes

No

1

CHECK YAW RATE AND LATERAL G SEN-
SOR USING OSCILLOSCOPE.
1) Connect all connectors.
2) Set oscilloscope to TCM connector termi-

nals.
Positive probe; (R100) No. 4
Earth lead; (R100) No. 6

3) Start the engine.
4) Measure signal voltage indicated on oscillo-

scope. <Ref. to VDC-17, WAVEFORM,
MEASUREMENT, Control Module I/O Sig-
nal.>
Is the voltage within the specified range?

2.1 V — 2.9 V

Go to step 2.

Replace yaw rate
and lateral G sen-
sor is normal.

2

CHECK YAW USING OSCILLOSCOPE.
1) Turn ignition switch to OFF.
2) Set oscilloscope to TCM connector termi-

nals.
Positive probe; (R100) No. 2
Earth lead; (R100) No. 6

3) Start the engine.
4) Measure signal voltage indicated on oscillo-

scope. <Ref. to VDC-17, WAVEFORM,
MEASUREMENT, Control Module I/O Sig-
nal.>
Is the voltage within the specified range?

5 V

Yaw rate and lat-
eral G sensor is
normal.

Replace yaw rate
and lateral G sen-
sor.

VDC-26

VDC

STEERING ANGLE SENSOR

7. Steering Angle Sensor

A: REMOVAL

The steering angle sensor must be always replace
as assembly with combination base switch,if any
problem is found,because this sensor can not be
disassembled.
Remove combination base switch assembly and
refer to LI section for installation.<Ref. to LI-xx,
Combination Base Switch Assembly.>

CAUTION:
After completion of installation procedure, the
following two position settings must be made.
• Steering angle sensor center positioning
• Yaw rate and lateral G sensor 0 positioning
These procedures are necessary for VDCCM to
later recognize what position the vehicle is in.
For procedures for the above two settings,
<Ref. to VDC-9, ADJUSTMENT, VDC Control
Module (VDCCM).>.

B: INSPECTION

Refer to “VDC section” for inspection procedures of
steering angle sensor.
<Ref. to VDC-114, DTC 71 ABNORMAL STEER-
ING ANGLE SENSOR, Diagnostics Chart with Di-
agnosis Connector.>

VDC-27

VDC

FRONT ABS SENSOR

8. Front ABS Sensor

A: NOTE

The ABS sensor installed on VDC equipped vehi-
cles is the same as the one on ABS equipped vehi-
cles. Therefore, for removal, inspection and
installation, refer to “ABS” section.
<Ref. to ABS-12, Front ABS Sensor.>