Subaru Forester 2004 Service Manual page 144

Diagnostics Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK BATTERY 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 voltage between ABSCM&
H/U connector and chassis ground.
Connector & terminal
LHD: (B301) No. 3 (+) — Chassis ground
−
( ):
RHD: (F49) No. 3 (+) — Chassis ground
−
( ):
2 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
−
( ):
3 CHECK OPEN CIRCUIT OF HARNESS.
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 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 (
4 CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.
5 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read out the DTC.
6 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES (DTCs) APPEARANCE.
Check
Is the voltage less than 1 V?
Is the voltage less than 1 V?
Is the voltage 10 — 13 V?
−
):
−
):
−
):
−
):
Is there poor contact in con-
nectors between TCM and
ABSCM&H/U?
Is the same DTC as in current
diagnosis still being output?
Are other DTCs being output? Proceed with the
ABS-143
ABS (DIAGNOSTIC)
Yes
Go to step 2. Repair the har-
ness between
TCM and
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/connector
between TCM and
ABSCM&H/U.
Repair the con- Go to step 5.
nector.
Replace the Go to step 6.
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