Subaru Legacy III (2000-2003 year). Manual - part 706

ABS-42

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

5

CHECK BATTERY SHORT OF HARNESS.
Measure voltage between ABSCM&H/U con-
nector and chassis ground.

Connector & terminal

DTC 21 / (F49) No. 11 (+) — Chassis 
ground (

−−−−

):

DTC 23 / (F49) No. 9 (+) — Chassis 
ground (

−−−−

):

DTC 25 / (F49) No. 14 (+) — Chassis 
ground (

−−−−

):

DTC 27 / (F49) No. 7 (+) — Chassis 
ground (

−−−−

):

Is the measured value less than the specified 
value?

1 V

Go to step 6.

Repair harness 
between 
ABSCM&H/U and 
ABS sensor.

6

CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between ABSCM&H/U 

connector and chassis ground.

Connector & terminal

DTC 21 / (F49) No. 11 (+) — Chassis 
ground (

−−−−

):

DTC 23 / (F49) No. 9 (+) — Chassis 
ground (

−−−−

):

DTC 25 / (F49) No. 14 (+) — Chassis 
ground (

−−−−

):

DTC 27 / (F49) No. 7 (+) — Chassis 
ground (

−−−−

):

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

1 V

Go to step 7.

Repair harness 
between 
ABSCM&H/U and 
ABS sensor.

7

CHECK INSTALLATION OF ABS SENSOR.
Turn ignition switch to OFF.
Are the ABS sensor installation bolts tightened 
with the specified torque?

33 N·m (3.4 kgf-m, 25 ft-lb)

Go to step 8.

Tighten ABS sen-
sor installation 
bolts securely.

8

CHECK ABS SENSOR GAP.
Measure tone wheel to ABS sensor 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 TONE WHEEL RUNOUT.
Measure tone wheel runout.
Is the measured value less than the specified 
value?

0.05 mm (0.0020 in)

Go to step 10.

Replace tone 
wheel. Front:  
<Ref. to ABS-19, 
Front Tone 
Wheel.>  Rear:  
<Ref. to ABS-20, 
Rear Tone 
Wheel.> 

Step

Value

Yes

No

ABS-43

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

10

CHECK GROUND SHORT OF ABS SENSOR.
1) Turn ignition switch to ON.
2) Measure resistance between ABS sensor 

and chassis ground.

Terminal

Front RH No. 1 — Chassis ground:
Front LH No. 1 — Chassis ground:
Rear RH No. 1 — Chassis ground:
Rear LH No. 1 — Chassis ground:

Does the measured value exceed the spec-
ified value?

1 M

Ω

Go to step 11.

Replace ABS sen-
sor and 
ABSCM&H/U. 
Front: <Ref. to 
ABS-12, Front 
ABS Sensor.>  
Rear:  <Ref. to 
ABS-15, Rear 
ABS Sensor.>  
and  <Ref. to ABS-
6, ABS Control 
Module and 
Hydraulic Control 
Unit (ABSCM&H/
U).> 

11

CHECK GROUND SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Connect connector to ABS sensor.
3) Measure resistance between ABSCM&H/U 

connector terminal and chassis ground.

Connector & terminal

DTC 21 / (F49) No. 11 — Chassis 
ground:
DTC 23 / (F49) No. 9 — Chassis ground:
DTC 25 / (F49) No. 14 — Chassis 
ground:
DTC 27 / (F49) No. 7 — Chassis ground:

Does the measured value exceed the spec-
ified value?

1 M

Ω

Go to step 12.

Repair harness 
between 
ABSCM&H/U and 
ABS sensor.
Replace 
ABSCM&H/U.  
<Ref. to ABS-6, 
ABS Control Mod-
ule and Hydraulic 
Control Unit 
(ABSCM&H/U).> 

12

CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between 
ABSCM&H/U and ABS sensor?

There is no poor contact.

Go to step 13.

Repair connector.

13

CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the DTC.

Is the same DTC still being output?

Same DTC is not indicated.

Go to step 14.

Replace 
ABSCM&H/U.  
<Ref. to ABS-6, 
ABS Control Mod-
ule and Hydraulic 
Control Unit 
(ABSCM&H/U).> 

14

CHECK ANY OTHER DTC APPEARANCE.
Are other DTC being output?

Other DTC is not indicated.

A temporary poor 
contact.

NOTE:
Check harness
and connectors
between AB-
SCM&H/U and
ABS sensor.

Proceed with the 
diagnosis corre-
sponding to the 
DTC.

Step

Value

Yes

No

ABS-44

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

H: DTC 22 ABNORMAL ABS SENSOR (FRONT RH)

NOTE:
For the diagnostic procedure, refer to DTC 28. <Ref. to ABS-46, DTC 28 ABNORMAL ABS SENSOR (REAR
LH), Diagnostics Chart with Diagnosis Connector.>  

I:

DTC 24 ABNORMAL ABS SENSOR (FRONT LH)

NOTE:
For the diagnostic procedure, refer to DTC 28. <Ref. to ABS-46, DTC 28 ABNORMAL ABS SENSOR (REAR
LH), Diagnostics Chart with Diagnosis Connector.>  

J: DTC 26 ABNORMAL ABS SENSOR (REAR RH)

NOTE:
For the diagnostic procedure, refer to DTC 28. <Ref. to ABS-46, DTC 28 ABNORMAL ABS SENSOR (REAR
LH), Diagnostics Chart with Diagnosis Connector.>  

ABS-45

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR

MEMO: