ABS(diag)-19
ABS (DIAGNOSTICS)
Subaru Select Monitor
Step
Check
Yes
No
1
CHECK IGNITION SWITCH.
Does the ignition switch turn to
ON?
Go to step 2.
Turn the ignition
switch to ON, and
select ABS mode
using Subaru
Select Monitor.
2
CHECK BATTERY.
1) Turn the ignition switch to OFF.
2) Measure the battery voltage.
Is the voltage more than 11 V? Go to step 3.
Charge or replace
the battery.
3
CHECK BATTERY TERMINAL.
Is there poor contact at battery
terminal?
Repair or tighten
the battery termi-
nal.
Go to step 4.
4
CHECK SUBARU SELECT MONITOR COM-
MUNICATION.
1) Turn the ignition switch to ON.
2) Using Subaru Select Monitor, check
whether communication to other system can
be executed normally.
Is the system name and model
year displayed on Subaru
Select Monitor?
Go to step 8.
Go to step 5.
5
CHECK SUBARU SELECT MONITOR COM-
MUNICATION.
1) Turn the ignition switch to OFF.
2) Disconnect the ABSCM&H/U connector.
3) Turn the ignition switch to ON.
4) Check whether communication to other
systems can be executed normally.
Is the system name and model
year displayed on Subaru
Select Monitor?
Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 6.
6
CHECK HARNESS CONNECTOR BETWEEN
EACH CONTROL MODULE AND DATA LINK
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect ABSCM&H/U, ECM and TCM.
3) Measure the resistance between data link
connector and chassis ground.
Connector & terminal
(B40) No. 10 — Chassis ground:
Is the resistance more than 1
M
Ω
?
Go to step 7.
Repair the har-
ness and connec-
tor between each
control module
and data link con-
nector.
7
CHECK OUTPUT SIGNAL FOR ABSCM&H/
U.
1) Turn the ignition switch to ON.
2) Measure the voltage between ABSCM&H/
U and chassis ground.
Connector & terminal
(B40) No. 10 (+) — Chassis ground (
−
):
Is the voltage less than 1 V?
Go to step 8.
Repair the har-
ness and connec-
tor between each
control module
and data link con-
nector.
8
CHECK HARNESS CONNECTOR BETWEEN
ABSCM&H/U AND DATA LINK CONNEC-
TOR.
Measure the resistance between ABSCM&H/U
connector and data link connector.
Connector & terminal
(B301) No. 7 — (B40) No. 10:
Is the resistance less than 0.5
Ω
?
Go to step 9.
Repair the har-
ness and connec-
tor between
ABSCM&H/U and
data link connec-
tor.
9
CHECK INSTALLATION OF ABSCM&H/U
CONNECTOR.
Turn the ignition switch to OFF.
Is the ABSCM&H/U connector
inserted into ABSCM&H/U until
it is locked by clamps?
Go to step 10.
Insert ABSCM&H/
U connector into
ABSCM&H/U.
10
CHECK POWER SUPPLY CIRCUIT.
1) Turn the ignition switch to ON. (engine
OFF)
2) Measure the ignition power supply voltage
between ABSCM&H/U connector and chassis
ground.
Connector & terminal
(B301) No. 18 (+) — Chassis ground (
−
):
Is the voltage 10 — 15 V?
Go to step 11.
Repair the open
circuit in harness
between
ABSCM&H/U and
battery.
Summary of Contents for 2004 LEGACY
Page 29: ...FS 28 FRONT SUSPENSION General Diagnostic Table ...
Page 56: ...RS 26 REAR SUSPENSION General Diagnostic Table ...
Page 69: ...WT 12 WHEEL AND TIRE SYSTEM General Diagnostic Table ...
Page 148: ...DI 78 DIFFERENTIALS General Diagnostic Table ...
Page 215: ...ABS 20 ABS G Sensor ...
Page 458: ...VDC diag 136 VEHICLE DYNAMICS CONTROL VDC DIAGNOSTICS General Diagnostic Table ...
Page 471: ...BR 12 BRAKE General Description 6 BRAKE BOOSTER 1 Brake booster BR 00335 1 ...
Page 507: ...BR 48 BRAKE Diagnosis ...