Subaru Forester 2004 Service Manual page 165

Diagnostics Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTIC)
Step
11 CHECK BATTERY SHORT OF HARNESS.
1) Turn the ignition switch to OFF.
2) Remove the console box.
3) Disconnect the connector from G sensor.
4) Disconnect the connector from ABSCM&
H/U.
5) Measure the voltage between ABSCM&H/
U connector and chassis ground.
Connector & terminal
LHD: (B301) No. 6 (+) — Chassis ground
−
( ):
RHD: (F49) No. 6 (+) — Chassis ground
−
( ):
12 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. 6 (+) — Chassis ground
−
( ):
RHD: (F49) No. 6 (+) — Chassis ground
−
( ):
13 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
14 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read out the DTC.
15 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES (DTCs) APPEARANCE.
16 CHECK INPUT VOLTAGE OF G SENSOR.
1) Turn the ignition switch to OFF.
2) Remove the console box.
3) Remove the G sensor from vehicle. (Do not
disconnect connector.)
4) Turn the ignition switch to ON.
5) Measure the voltage between G sensor
connector terminals.
Connector & terminal
(B292) No. 1 (+) — No. 3 (
17 CHECK OPEN CIRCUIT IN G SENSOR OUT-
PUT HARNESS AND GROUND HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ABSCM&
H/U.
3) Measure the resistance between
ABSCM&H/U connector terminals.
Connector & terminal
LHD: (B301) No. 6 — No. 28:
RHD: (F49) No. 6 — No. 28:
Is the voltage less than 1 V?
Is the voltage less than 1 V?
nector between ABSCM&H/U
and G sensor?
Is the same DTC as in current
diagnosis still being output?
Are other DTCs being output? Proceed with the
Is the voltage 4.75 — 5.25 V? Go to step 17.
−
):
Is the resistance 5.0 — 5.6
kΩ?
ABS-164
Check
Go to step 12.
Go to step 13.
Repair the con-
nector.
Replace the
ABSCM only.
<Ref. to ABS-8,
ABSCM (ABS
CONTROL MOD-
ULE), REPLACE,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
diagnosis corre-
sponding to DTC.
Go to step 18.
Yes No
Repair the har-
ness between G
sensor and
ABSCM&H/U.
Repair the har-
ness between G
sensor and
ABSCM&H/U.
Go to step 14.
Go to step 15.
A temporary poor
contact.
Repair the har-
ness/connector
between G sensor
and ABSCM&H/U.
Repair the har-
ness/connector
between G sensor
and ABSCM&H/U.