Subaru Legacy III (2000-2003 year). Manual - part 754

VDC-52

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

5

CHECK BATTERY SHORT OF HARNESS.
Measure voltage between VDCCM connector 
and chassis ground.

Connector & terminal

DTC 21 / (F87) No. 14 (+) — Chassis 
ground (

−−−−

):

DTC 23 / (F87) No. 49 (+) — Chassis 
ground (

−−−−

):

DTC 25 / (F87) No. 18 (+) — Chassis 
ground (

−−−−

):

DTC 27 / (F87) No. 16 (+) — Chassis 
ground (

−−−−

):

Is the measured value less than the specified 
value?

1 V

Go to step 6.

Repair harness 
between VDCCM 
and ABS sensor.

6

CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM connec-

tor and chassis ground.

Connector & terminal

DTC 21 / (F87) No. 14 (+) — Chassis 
ground (

−−−−

):

DTC 23 / (F87) No. 49 (+) — Chassis 
ground (

−−−−

):

DTC 25 / (F87) No. 18 (+) — Chassis 
ground (

−−−−

):

DTC 27 / (F87) No. 16 (+) — Chassis 
ground (

−−−−

):

Is the measured value less than the speci-
fied value?

1 V

Go to step 7.

Repair harness 
between VDCCM 
and ABS sensor.

7

CHECK INSTALLATION OF ABS SENSOR.

Tightening torque:

33

±±±±

10 N·m (3.3

±±±±

1.0 kgf-m, 24

±±±±

7 ft-lb)

Are the ABS sensor installation bolts tightened 
securely?

Tightened securely.

Go to step 8.

Tighten ABS sen-
sor installation 
bolts securely.

8

CHECK ABS SENSOR GAP.
Measure tone wheel-to-pole piece gap over 
entire perimeter of the wheel.
Is the measured value within the specified 
range?

Front wheel 0.3 - 0.8 mm 
(0.012 - 0.031 in) and Rear 
wheel 0.44 - 0.94 mm (0.0173 - 
0.0370 in)

Go to step 9.

Adjust the gap.

NOTE:
Adjust the gap us-
ing spacers (Part
No. 26755AA000).
If spacers cannot
correct the gap, re-
place worn sensor
or worn tone
wheel.

9

CHECK HUB AND TONE WHEEL RUNOUT.
Measure hub and tone wheel runout.
Is the measured value less than the specified 
value?

0.05 mm (0.0020 in)

Go to step 10.

Repair hub and 
tone wheel. Front  
<Ref. to VDC-27, 
Front ABS Sen-
sor.> Rear  <Ref. 
to VDC-28, Rear 
ABS Sensor.>

10

CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between 
VDCCM and ABS sensor?

There is poor contact.

Repair connector.

Go to step 11.

Step

Value

Yes

No

VDC-53

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

11

CHECK VDCCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the diagnostic trouble code.

Is the same diagnostic trouble code as in 
the current diagnosis still being output?

Same DTC indicated.

Replace VDCCM. 
<Ref. to VDC-8, 
VDC Control Mod-
ule (VDCCM).>

Go to step 12.

12

CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
Are other diagnostic trouble codes being out-
put?

Other DTC indicated.

Proceed with the 
diagnosis corre-
sponding to the 
diagnostic trouble 
code.

A temporary poor 
contact.

NOTE:
Check harness
and connectors
between VDCCM
and ABS sensor.

Step

Value

Yes

No

VDC-54

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

J: DTC 22 ABNORMAL ABS SENSOR (ABNORMAL ABS SENSOR SIGNAL) 

(FRONT RH)

NOTE:
For diagnostic procedure, refer to DTC 28. <Ref. to VDC-56, DTC 28 ABNORMAL ABS SENSOR (ABNOR-
MAL ABS SENSOR SIGNAL) (REAR LH), Diagnostics Chart with Diagnosis Connector.>

K: DTC 24 ABNORMAL ABS SENSOR (ABNORMAL ABS SENSOR SIGNAL) 

(FRONT LH)

NOTE:
For diagnostic procedure, refer to DTC 28. <Ref. to VDC-56, DTC 28 ABNORMAL ABS SENSOR (ABNOR-
MAL ABS SENSOR SIGNAL) (REAR LH), Diagnostics Chart with Diagnosis Connector.>

L: DTC 26 ABNORMAL ABS SENSOR (ABNORMAL ABS SENSOR SIGNAL) 

(REAR RH)

NOTE:
For diagnostic procedure, refer to DTC 28. <Ref. to VDC-56, DTC 28 ABNORMAL ABS SENSOR (ABNOR-
MAL ABS SENSOR SIGNAL) (REAR LH), Diagnostics Chart with Diagnosis Connector.>

VDC-55

VDC (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

MEMO: