Subaru Legacy 2002 Service Manual page 2439

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (Diagnostics)
No.
1 CHECK INPUT VOLTAGE OF ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM&H/U.
3) Turn ignition switch to ON.
4) Measure voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 25 (+) — Chassis ground (−):
2 CHECK GROUND CIRCUIT OF MOTOR.
1) Turn ignition switch to OFF.
2) Measure resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 26 — Chassis ground:
3 CHECK INPUT VOLTAGE OF ABSCM&H/U.
1) Run the engine at idle.
2) Measure voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 1 (+) — Chassis ground (−):
4 CHECK GROUND CIRCUIT OF
ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Measure resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 23 — Chassis ground:
5 CHECK MOTOR OPERATION.
Operate the sequence control. <Ref. to
ABS-9, ABS Sequence Control.>
NOTE:
Use the diagnosis connector to operate the
sequence control.
6 CHECK POOR CONTACT IN CONNEC-
TORS.
Turn ignition switch to OFF.
7 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the DTC.
8 CHECK ANY OTHER DTC APPEARANCE.
Step
Is the voltage between 10
and 13 V?
Is the resistance less than
0.5 Ω?
Is the voltage between 10
and 15 V?
Is the resistance less than
0.5 Ω?
Can motor revolution noise
(buzz) be heard when car-
rying out the sequence
control?
Is there poor contact in
connector between
generator, battery and
ABSCM&H/U?
Is the same DTC as in the
current diagnosis still being
output?
Are other DTC being out-
put?
ABS-138
Check Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Repair connector.
Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Proceed with the
diagnosis corre-
sponding to the
DTC.
No
Repair harness/
connector
between battery
and ABSCM&H/U
and check fuse
SBF6.
Repair
ABSCM&H/U
ground harness.
Repair harness
connector
between battery,
ignition switch and
ABSCM&H/U.
Repair
ABSCM&H/U
ground harness.
Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 7.
Go to step 8.
A temporary poor
contact.