Subaru Forester 2004 Service Manual page 173

Diagnostics Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTIC)
Step
1 CHECK ALL FOUR WHEELS FOR FREE
TURNING.
2 CHECK OUTPUT OF G SENSOR USING SE-
LECT MONITOR.
1) Select "Current data display & Save" on the
select monitor.
2) Read the select monitor display.
3 CHECK OUTPUT OF G SENSOR USING SE-
LECT MONITOR.
1) Turn the ignition switch to OFF.
2) Remove the console box.
3) Remove the G sensor from vehicle. (Do not
disconnect the connector.)
4) Turn the ignition switch to ON.
5) Select "Current data display & Save" on the
select monitor.
6) Read the select monitor display.
4 CHECK OUTPUT OF G SENSOR USING SE-
LECT MONITOR.
Read the select monitor display.
5 CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.
6 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read out the DTC.
7 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES (DTCs) APPEARANCE.
8 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:
9 CHECK G SENSOR.
1) Remove the console box.
2) Remove the G sensor from vehicle.
3) Connect the connector to G sensor.
4) Connect the connector to ABSCM&H/U.
5) Turn the ignition switch to ON.
6) Measure the voltage between G sensor
connector terminals.
Connector & terminal
(B292) No. 2 (+) — No. 3 (
Have the wheels been turned
freely such as when vehicle is
lifted up, or operated on a roll-
ing road?
Is the G sensor output on mon-
itor display 2.1 — 2.5 V when
the vehicle is in horizontal posi-
tion?
Is the voltage 3.7 — 4.1 V
when G sensor is inclined for-
wards to 90°?
Is the voltage 0.5 — 0.9 V
when G sensor is inclined
backwards to 90°?
Is there poor contact in con-
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 resistance 5.0 — 5.6
kΩ?
Is the voltage 2.1 — 2.5 V
when G sensor is in horizontal
position?
−
):
ABS-172
Check
The ABS is nor-
mal. Erase the
DTC.
Go to step 3.
Go to step 4.
Go to step 5.
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 9.
Go to step 10.
Yes No
Go to step 2.
Go to step 8.
Replace the G
sensor. <Ref. to
ABS-23, G Sen-
sor.>
Replace the G
sensor. <Ref. to
ABS-23, G Sen-
sor.>
Go to step 6.
Go to step 7.
A temporary poor
contact.
Repair the har-
ness connector
between G sensor
and ABSCM&H/U.
Replace the G
sensor. <Ref. to
ABS-23, G Sen-
sor.>