Subaru IMPREZA 2002 Service Manual page 331

3
DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
~~ ~
Step
I
CHECK INPUT VOLTAGE OF RELAY HOLD-
ER.
1)Turn the ignition switch to OFF.
2)Remode the fuse.
3)Measure the voltage between ABS relay
connector and chassis ground.
Connector & terminal
(8225)
No.
5 (+)
-
Chassis ground ( - ) :
2
CHECK RELAY HOLDER.
3 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
(8264)
No.
2 (+)
-
Chassis ground (-):
CHECK INPUT VOLTAGE OF ABS RELAY.
Measure the voltage between ABS relay con-
nector and chassis ground.
Connector & terminal
.
(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.
1
5
Connector & terminal
(6264)
No.
3
(+)
-
Chassis ground:
6 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&H/U.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ABSCM&
HIU.
3)Run the engine at idle.
4)Measure the voltage between ABSCM&H/U
connector and chassis ground.
7
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.
B
Connector & terminal
(F49)
No.
23
-
Chassis ground:
9
CHECK POOR CONTACT IN CONNECTORS
10 CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the diagnostic trouble code.
Check
Is the voltage more than 10 V?
Is the fuse blown out?
Is the voltage more than 10 V?
I s the voltage more than 10 V?
I s
the resistance less than 5
a?
Is the resistance less than 10
Q?
Is the voltage between 10 and
15 V?
Is the resistance less than 0.5
Q?
Is
there poor contact in con-
nectors between generator,
battery and ABSCM&H/U?
Is the same diagnostic trouble
code as in the current diagno-
sis still being output?
Yes
30
to step 2.
3eplace the fuse.
30 to step 4.
30 to step 5.
So to step
6 .
So to step 7.
Go to step
8.
Go to step 9.
Repair the con-
nector.
Replace the
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
No
3epair open circuit
n harness
ietween battery
3nd Relay holder
:onnector.
So to step 3.
Repair open circuit
in harness
between battery
snd Relay holder
sonnector.
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
and ABSCM&H/U.
Repair the
ABSCM&H/U
ground harness.
Go to step 10.
Go to step 11.
ABS-I 45