Subaru IMPREZA 2002 Service Manual page 339

I
DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
Step
1
CHECK INPUT VOLTAGE OF ABSCM&H/U.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ABSCM&
H/U.
3)Turn the ignition switch to ON.
4)Measure the voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 25 (+)
-
Chassis ground (-):
2
CHECK GROUND CIRCUIT OF MOTOR.
1)Turn the ignition switch to OFF.
2)Measure the resistance between
ABSCM&H/U connector and chassis ground.
Connector & terminal
(F49) No. 26
-
Chassis ground:
3 CHECK MOTOR OPERATION.
Operate the sequence control. <Ref. to ABS-
11, ABS Sequence Control.>
NOTE:
Use the diagnosis connector to operate the se,
quence control.
4
%HECK POOR CONTACT IN CONNECTORS
Turn the ignition switch to OFF.
5
CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the diagnostic trouble code.
6
CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
Check
Is the voltage between 10 and
13 V?
Is the resistance less than 0.5
Q?
Can the motor revolution noise
(buzz) be heard when carrying
out the check sequence?
Is there poor contact in con-
nector between hydraulic unit,
relay box and ABSCM&H/U?
Is the same diagnostic trouble
code as in the current diagno-
sis still being output?
Are other diagnostic trouble
codes being output?
~~ ~
Yes
30 to step 2.
Go to step 3.
Go to step 4.
Repair the con-
nector.
Replace the
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Proceed with the
diagnosis corre-
sponding to the
diagnostic trouble
code.
No
Repair harness/
connector
between battery
and ABSCM&H/U
and check fuse
SBFG.
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 5.
Go to step
6.
A temporary poor
contact.
ABS-I 53