Subaru Forester 2004 Service Manual page 82

Diagnostics Procedure without Diagnostic Trouble Code (DTC)
Step
1 CHECK SPECIFICATIONS OF THE
ABSCM&H/U.
Check specifications of the mark to on
ABSCM&H/U.
CO: AT
CD: MT
2 CHECK GROUND SHORT OF HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect all connectors from TCM.
3) Disconnect the connector from ABSCM&
H/U.
4) Measure the resistance between
ABSCM&H/U connector and chassis ground.
Connector & terminal
LHD: (B301) No. 3 — Chassis ground:
RHD: (F49) No. 3 — Chassis ground:
3 CHECK BATTERY SHORT OF HARNESS.
Measure the voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
LHD: (B301) No. 3 (+) — Chassis ground
−
( ):
RHD: (F49) No. 3 (+) — Chassis ground
−
( ):
4 CHECK BATTERY SHORT OF HARNESS.
1) Turn the ignition switch to ON.
2) Measure the voltage between ABSCM&H/
U connector and chassis ground.
Connector & terminal
LHD: (B301) No. 3 (+) — Chassis ground
−
( ):
RHD: (F49) No. 3 (+) — Chassis ground
−
( ):
5 CHECK TCM.
1) Turn the ignition switch to OFF.
2) Connect all connectors to TCM.
3) Turn the ignition switch to ON.
4) Measure the voltage between TCM con-
nector terminal and chassis ground.
Connector & terminal
Non-turbo Model
(B55) No. 21 (+) — Chassis ground (
Turbo Model
(B54) No. 12 (+) — Chassis ground (
6 CHECK AT.
7 CHECK OPEN CIRCUIT OF HARNESS.
Measure the voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
LHD:
(B301) No. 3 (+) — Chassis ground (
(B301) No. 31 (+) — Chassis ground (
RHD:
(F49) No. 3 (+) — Chassis ground (
(F49) No. 31 (+) — Chassis ground (
8 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
Check
Are the specifications between
vehicle and ABSCM&H/U
matched?
Is the resistance more than 1
MΩ?
Is the voltage less than 1 V?
Is the voltage less than 1 V?
Is the voltage less than 10 —
15 V?
−
):
−
):
Is the AT functioning normally? Replace the TCM. Repair the AT.
Is the voltage less than 10 —
15 V?
−
):
−
):
−
):
−
):
nectors between TCM and
ABSCM&H/U?
ABS-81
ABS (DIAGNOSTIC)
Yes
Go to step 2. Replace the
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 3. Repair the har-
ness between
TCM and
ABSCM&H/U.
Go to step 4. Repair the har-
ness between
TCM and
ABSCM&H/U.
Go to step 5. Repair the har-
ness between
TCM and
ABSCM&H/U.
Go to step 7. Go to step 6.
Go to step 8. Repair the har-
ness/connector
between TCM and
ABSCM&H/U.
Repair the con- Go to step 9.
nector.
No