Subaru Legacy 2003 Service Manual page 2858

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
1 CHECK SPECIFICATIONS OF THE AB-
SCM&H/U.
Check specifications of the mark to the
ABSCM&H/U.
CG: AT (Except OUTBACK)
CH: MT (Except OUTBACK)
CI: AT (OUTBACK)
CJ: MT (OUTBACK)
Do the vehicle specification and the specifica-
tion of ABSCM&HU match?
2 CHECK GROUND SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect two connectors from TCM.
3) Disconnect connector from ABSCM&H/U.
4) Measure resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 3 — Chassis ground:
Does the measured value exceed the spec-
ified value?
3 CHECK BATTERY SHORT OF HARNESS.
Measure voltage between ABSCM&H/U con-
nector and chassis ground.
Connector & terminal
(F49) No. 3 (+) — Chassis ground ( − − − − ):
Is the measured value less than the specified
value?
4 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?
5 CHECK TCM.
1) Turn ignition switch to OFF.
2) Connect all connectors to TCM.
3) Turn ignition switch to ON.
4) Measure voltage between TCM connector
terminal and chassis ground.
Connector & terminal
(B55) No. 21 (+) — Chassis ground ( − − − − ):
Is the measured value within the specified
range?
6 CHECK AT.
Is the AT functioning normally?
7 CHECK OPEN CIRCUIT OF HARNESS.
Measure voltage between ABSCM&H/U con-
nector and chassis ground.
Connector & terminal
(F49) No. 3 (+) — Chassis ground ( − − − − ):
(F49) No. 31 (+) — Chassis ground ( − − − − ):
Is the measured value within the specified
range?
8 CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between
TCM and ABSCM&H/U?
Value
Both are the same specifica-
tions.
1 MΩ
1 V
1 V
10 - 15 V
Function of AT is normal.
10 - 15 V
There is no poor contact.
ABS-67
ABS (DIAGNOSTICS)
Yes
Go to step 2. Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 3. Repair harness
between TCM and
ABSCM&H/U.
Go to step 4. Repair harness
between TCM and
ABSCM&H/U.
Go to step 5. Repair harness
between TCM and
ABSCM&H/U.
Go to step 7. Go to step 6.
Replace TCM. Repair AT.
Go to step 8. Repair harness/
connector
between TCM and
ABSCM&H/U.
Go to step 9. Repair connector.
No