Subaru Forester 2004 Service Manual page 142

Diagnostics Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK SPECIFICATIONS OF THE AB-
SCM&H/U.
Check specifications of the mark on the
ABSCM&H/U.
CO: AT
CP: MT
2 CHECK GROUND SHORT OF HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the two 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 TCM.
1) Connect all connectors to TCM.
2) Turn the ignition switch to ON.
3) Measure the voltage between TCM con-
nector terminal and chassis ground.
Connector & terminal
Turbo Model:
(B54) No. 12 (+) — Chassis ground (
Non-turbo Model:
(B55) No. 21 (+) — Chassis ground (
4 CHECK AT.
5 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 (
6 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
7 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read out the DTC.
8 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES (DTCs) APPEARANCE.
Check
Does the vehicle specification
and ABSCM&H/U specifica-
tion match?
Is the resistance more than 1
MΩ?
Is the voltage 10 — 15 V?
−
):
−
):
Is the AT functioning normally? Replace the TCM. Repair the AT.
Is the voltage more than 10 V? Go to step 6.
−
):
−
):
−
):
−
):
nectors between TCM and
ABSCM&H/U?
Is the same DTC as in the cur-
rent diagnosis still being out-
put?
Are other DTCs being output? Proceed with the
ABS-141
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 5. Go to step 4.
Repair the har-
ness/connector
between TCM and
ABSCM&H/U.
Repair the con- Go to step 7.
nector.
Replace the Go to step 8.
ABSCM only.
<Ref. to ABS-8,
ABSCM (ABS
CONTROL MOD-
ULE), REPLACE,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
A temporary poor
diagnosis corre- contact.
sponding to DTC.
No