Subaru Forester 2004 Service Manual page 160

Diagnostics Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK OUTPUT OF G SENSOR USING SE-
LECT MONITOR.
1) Select "Current data display & Save" on the
select monitor.
2) Read the G sensor output in select monitor
data display.
2 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
3 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read out the DTC.
4 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES (DTCs) APPEARANCE.
5 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 (
6 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:
7 CHECK GROUND SHORT IN G SENSOR
OUTPUT HARNESS.
1) Disconnect the connector from G sensor.
2) Measure the resistance between
ABSCM&H/U connector and chassis ground.
Connector & terminal
LHD: (B301) No. 6 — Chassis ground:
RHD: (F49) No. 6 — Chassis ground:
8 CHECK G SENSOR.
1) Connect the connector to G sensor.
2) Connect the connector to ABSCM&H/U.
3) Turn the ignition switch to ON.
4) Measure the voltage between G sensor
connector terminals.
Connector & terminal
(B292) No. 2 (+) — No. 3 (
Is the G sensor output on mon-
itor display 2.1 — 2.5 V when
G sensor is in horizontal posi-
tion?
nector between ABSCM&H/U
and G sensor?
Is the same DTC as in the cur-
rent diagnosis still being out-
put?
Are other DTCs being output? Proceed with the
Is the voltage 4.75 — 5.25 V? Go to step 6.
−
):
Is the resistance 5.0 — 5.6
kΩ?
Is the resistance more than 1
MΩ?
Is the voltage 2.1 — 2.5 V
when G sensor is in horizontal
position?
−
):
ABS-159
Check
Go to step 2.
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 7.
Go to step 8.
Go to step 9.
ABS (DIAGNOSTIC)
Yes No
Go to step 5.
Go to step 3.
Go to step 4.
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.
Repair the har-
ness between G
sensor and
ABSCM&H/U.
Replace the G
sensor. <Ref. to
ABS-23, G Sen-
sor.>