Subaru Legacy 2003 Service Manual page 2912

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
Step
1 CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect two connectors from TCM.
3) Disconnect connector from ABSCM&H/U.
4) Measure voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 3 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
2 CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 3 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
3 CHECK OPEN CIRCUIT OF HARNESS.
1) Turn ignition switch to OFF.
2) Connect all connectors to TCM.
3) Turn ignition switch to ON.
4) Measure voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 3 (+) — Chassis ground ( − − − − ):
(F49) No. 31 (+) — Chassis ground ( − − − − ):
Is the measured value within the specified
range?
4 CHECK POOR CONTACT IN CONNECTORS.
Turn ignition switch to OFF.
Is there poor contact in connectors between
TCM and ABSCM&H/U?
5 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?
6 CHECK ANY OTHER DTC APPEARANCE.
Are other DTC being output?
Value
1 V
1 V
10 - 13 V
There is no poor contact.
Same DTC is not indicated.
Other DTC is not indicated.
ABS-121
ABS (DIAGNOSTICS)
Yes
Go to step 2. Repair harness
between TCM and
ABSCM&H/U.
Go to step 3. Repair harness
between TCM and
ABSCM&H/U.
Go to step 4. Repair harness/
connector
between TCM and
ABSCM&H/U.
Go to step 5. Repair connector.
Go to step 6. Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
A temporary poor Proceed with the
contact. diagnosis corre-
sponding to the
DTC.
No