Subaru 2002 IMPREZA Service Manual page 2235

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
Step
2 CHECK GROUND SHORT OF HARNESS.
1)Turn the ignition switch to OFF.
2)Disconnect the 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
LHD: (B301) No. 3 — Chassis ground:
RHD: (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
(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
LHD: (B301) No. 3 (+) — Chassis ground
( − − − − ):
LHD: (B301) No. 31 (+) — Chassis
ground ( − − − − ):
RHD: (F49) No. 3 (+) — Chassis ground
( − − − − ):
RHD: (F49) No. 31 (+) — Chassis ground
( − − − − ):
6 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
7 CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the DTC.
8 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES (DTCs) APPEARANCE.
Check
Is the resistance more than 1
MΩ?
Is the voltage between 10 and
15 V?
Is the AT functioning normally? Replace the TCM. Repair the AT.
Is the voltage more than 10 V? Go to step 6.
nectors between TCM and
ABSCM&H/U?
Is the same DTC as in the cur-
rent diagnosis still being out-
put?
Are other DTCs being output? Proceed with the
ABS-137
ABS (DIAGNOSTICS)
Yes
Go to step 3. Repair the har-
ness between
TCM and
ABSCM&H/U.
Go to step 5. Go to step 4.
Repair the har-
ness/connector
between TCM and
ABSCM&H/U.
Repair the con- Go to step 7.
nector.
Replace the Go to step 8.
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
A temporary poor
diagnosis corre- contact.
sponding to DTC.
No