Subaru IMPREZA 2002 Service Manual page 325

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
~
Step
1
CHECK SPECIFICATIONS OF THE AB-
SCM&H/U
.
Check specifications of the mark to the
ABSCM&H/U.
CC: AT
CD: MT
2
CHECK GROUND SHORT OF HARNESS.
1)Turn the ignition switch to OFF.
2)Disconnect two connectors from TCM.
3)Disconnect the connector from ABSCM&
H/U.
4)Measure the resistance between
ABSCM&H/U connector and chassis ground.
Connector & terminal
(F49) No. 3
-
Chassis ground:
3 CHECK TCM.
1)Connect all connectors to TCM.
2)Turn the ignition switch to ON.
3)Measure the voltage between TCM connec-
,tor terminal and chassis ground.
Connector & terminal
NON-TURBO MODEL:
(854) No. 19 (+)
-
Chassis ground (-):
TURBO MODEL:
(B55) No. 21 (+)
-
Chassis ground ( - ) :
4 CHECK AT.
5 CHECK OPEN CIRCUIT OF HARNESS.
Measure the voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49)
No. 3 (+)
-
Chassis ground ( - ) :
(F49)
No.
31
(+)
-
Chassis ground (-):
CHECK POOR CONTACT IN CONNECTORS.
6
7
CHECK ABSCM&HN.
1 )Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the diagnostic trouble code.
8
CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
Check
s an ABSCM&H/U for AT
model installed on a MT
nodel?
Is the resistance more than 1
MQ?
Is
the voltage between 10 and
15 V?
Is the AT functioning normally?
Is the voltage more than IO V?
Is there poor contact in con-
nectors between TCM 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
Replace the
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 3.
Go to step 5.
Replace the TCM.
Go to step 6.
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
Go to step 2.
Repair harness
between TCM and
ABSCM&H/U.
Go to step 4.
Repair the AT.
Repair harness/
connector
between TCM and
ABSCM&H/U.
Go to step 7.
Go to step 8.
A temporary poor
contact.
ABS-I
39