Subaru Legacy 2003 Service Manual page 2934

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
Step
1 CHECK OUTPUT OF G SENSOR USING SE-
LECT MONITOR.
1) Select "Current data display & Save" on the
select monitor.
2) Read G sensor output on the select monitor
display.
Is the G sensor output on monitor display
within the specified range when the G sen-
sor is in horizontal position?
2 CHECK POOR CONTACT IN CONNECTORS.
Turn ignition switch to OFF.
Is there poor contact in connector between
ABSCM&H/U and G sensor?
3 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the DTC.
Is the same DTC still being output?
4 CHECK ANY OTHER DTC APPEARANCE.
Are other DTC being output?
5 CHECK OPEN CIRCUIT IN G SENSOR OUT-
PUT HARNESS AND GROUND HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM&H/U.
3) Measure resistance between ABSCM&H/U
connector terminals.
Connector & terminal
(F49) No. 6 — No. 28:
Is the measured value within the specified
range?
6 CHECK GROUND SHORT OF HARNESS.
Measure resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 28 — Chassis ground:
Does the measured value exceed the specified
value?
7 CHECK G SENSOR.
1) Remove console box.
2) Remove G sensor from vehicle.
3) Connect connector to G sensor.
4) Connect connector to ABSCM&H/U.
5) Turn ignition switch to ON.
6) Measure voltage between G sensor con-
nector terminals.
Connector & terminal
(R70) No. 2 (+) — No. 3 ( − − − − ):
Is the voltage within the specified range
when G sensor is horizontal?
Value
2.1 - 2.5 V
There is no poor contact.
Same DTC is not indicated.
Other DTC is not indicated.
5.0 - 5.6 kΩ
1 MΩ
2.1 - 2.5 V
ABS-143
ABS (DIAGNOSTICS)
Yes
Go to step 2. Go to step 6.
Go to step 3. Repair connector.
Go to step 4. Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
A temporary poor Proceed with the
contact. diagnosis corre-
sponding to the
DTC.
Go to step 6. Repair harness/
connector
between G sensor
and ABSCM&H/U.
Go to step 7. Repair harness
between G sensor
and ABSCM&H/U.
Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 8. Replace G sen-
sor. <Ref. to ABS-
21, G Sensor.>
No