Subaru Legacy 2002 Service Manual page 2452

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
No.
1 CHECK OUTPUT OF G SENSOR USING
SELECT MONITOR.
1) Select "Current data display & Save" on
the select monitor.
2) Read G sensor output on the select moni-
tor display.
2 CHECK POOR CONTACT IN CONNEC-
TORS.
Turn ignition switch to OFF.
3 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the DTC.
4 CHECK ANY OTHER DTC APPEARANCE.
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:
6 CHECK GROUND SHORT OF HARNESS.
Measure resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 28 — Chassis ground:
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 (−):
8 CHECK G SENSOR.
Measure voltage between G sensor connector
terminals.
Connector & terminal
(R70) No. 2 (+) — No. 3 (−):
9 CHECK G SENSOR.
Measure voltage between G sensor connector
terminals.
Connector & terminal
(R70) No. 2 (+) — No. 3 (−):
Step
Is the G sensor output on
monitor display 2.3±0.2 V
when the G sensor is in
horizontal position?
Is there poor contact in
connector between
ABSCM&H/U and G sen-
sor?
Is the same DTC as in the
current diagnosis still being
output?
Are other DTC being out-
put?
Is the resistance between
4.3 and 4.9 kΩ?
Is the resistance more than
1 MΩ?
Is the voltage between 2.1
and 2.5 V when G sensor
is horizontal?
Is the voltage between 3.7
and 4.1 V when G sensor
is inclined forwards to 90°?
Is the voltage between 0.5
and 0.9 V when G sensor
is inclined backwards to
90°?
ABS-151
Check Yes
Go to step 2.
Repair connector.
Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Proceed with the
diagnosis corre-
sponding to the
DTC.
Go to step 6.
Go to step 7.
Go to step 8.
Go to step 9.
Go to step 10.
ABS (Diagnostics)
No
Go to step 6.
Go to step 3.
Go to step 4.
A temporary poor
contact.
Repair harness/
connector
between G sensor
and ABSCM&H/U.
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).>
Replace G sen-
sor. <Ref. to ABS-
22, G Sensor.>
Replace G sen-
sor. <Ref. to ABS-
22, G Sensor.>
Replace G sen-
sor. <Ref. to ABS-
22, G Sensor.>