Subaru Legacy 2002 Service Manual page 2379

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
ABS (Diagnostics)
No.
8 CHECK GROUND SHORT OF HARNESS.
Measure resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 28 — Chassis ground:
9 CHECK G SENSOR.
1) Turn ignition switch to OFF.
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 (−):
10 CHECK G SENSOR.
Measure voltage between G sensor connector
terminals.
Connector & terminal
(R70) No. 2 (+) — No. 3 (−):
11 CHECK G SENSOR.
Measure voltage between G sensor connector
terminals.
Connector & terminal
(R70) No. 2 (+) — No. 3 (−):
12 CHECK POOR CONTACT IN CONNEC-
TORS.
13 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the DTC.
14 CHECK ANY OTHER DTC APPEARANCE.
Step
Is the resistance more than
1 MΩ?
Is the voltage between 2.1
and 2.4 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°?
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?
ABS-78
Check Yes
Go to step 9.
Go to step 10.
Go to step 11.
Go to step 12.
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.
No
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.>
Go to step 13.
Go to step 14.
A temporary poor
contact.