Subaru IMPREZA 2002 Service Manual page 265

m
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
ABS (DIAGNOSTICS)
~~~ ~
Step
CHECK INPUT VOLTAGE OF RELAY HOLD-
ER.
1)Turn the ignition switch to OFF.
2)Remove the fuse.
3)Measure the voltage between ABS relay
connector and chassis ground.
Connector & terminal
(6225) No. 5 (+)
-
Chassis ground ( - ) :
! CHECK RELAY HOLDER.
I
CHECK INPUT VOLTAGE OF ABS RELAY.
1)lnstall the fuse.
2)Remove the ABS relay.
3)Turn the ignition switch to ON.
4)Measure the voltage between ABS relay
connector and chassis ground.
Connector & terminal
(6264) No. 2 (+)
-
Chassis ground ( - ) :
CHECK INPUT VOLTAGE OF ABS RELAY.
Measure the voltage between ABS relay con-
nector and chassis ground.
Connector & terminal
I
(6264) No. 1 (+)
-
Chassis ground (-):
CHECK GROUND CIRCUIT OF ABS RELAY.
1)Turn the ignition switch to OFF.
2)Measure the resistance between ABS relay
connector and chassis ground.
Connector & terminal
(6264) No. 3 (+)
-
Chassis ground:
i
CHECK ABS RELAY.
1)Connect the battery to ABS relay terminal
No. 1 and 3.
2)Measure the resistance between ABS relay
terminals.
CHECK INPUT VOLTAGE OF ABSCM&HIU.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ABSCM&
H/U.
3)Run the engine at idle.
4)Measure the voltage between ABSCM&H/U
connector and chassis ground.
?
Connector & terminal
(F49) No. 1 (+)
-
Chassis ground (-):
(F49) No. 24 (+)
-
Chassis ground ( - ) :
CHECK GROUND CIRCUIT OF ABSCM&H/U.
1)Turn the ignition switch to OFF.
2)Measure the resistance between
ABSCM&H/U connector and chassis ground.
5
Connector & terminal
(F49) No. 23
-
Chassis ground:
3
CHECK VALVE RELAY IN ABSCM&H/U.
Measure the resistance between ABSCM&H/U
and terminals.
Terminals
NO. 23 (+)
-
NO.
24 (-):
I O
CHECK POOR CONTACT IN CONNECTORS.
Check
s the voltage more than 10 V?
s
the fuse blown out?
s the voltage more than 10 V?
s the voltage more than 10 V?
s the resistance less than 5
2?
s the resistance less than 10
2?
s the voltage between 10 and
I5
V?
s the resistance less than 0.5
;2?
s
the resistance more than 1
VlQ?
s there poor contact in con-
lectors between generator,
iattery and ABSCM&H/U?
Yes
30 to step 2.
3eplace fuse.
30 to step 4.
30 to step 5.
30 to step 6.
30 to step 7 .
30 to step 8.
Go to step
9.
Go to step 10.
Repair the con-
nector.
No
Repair open circuit
in harness
between battery
and relay holder
Connector.
Go to step 3 .
Repair open circuit
in harness
between battery
and relay holder
connector.
Repair harness
connector
between battery,
ignition switch and
ABS relay.
Repair open circuit
between ABS
relay and chassis
ground.
Replace the ABS
relay.
Repair harness
connector
between battery,
ABS relay and
ABSCM&H/U.
Repair the
ABSCM&H/U
ground harness.
Replace the
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 11.
ABS-79