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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1
CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and
transmission.
3) Measure the resistance of harness
between TCM and transmission connector.
Connector & terminal
(B54) No. 17 — (B11) No. 15:
(B55) No. 8 — (B11) No. 4:
(B54) No. 5 — Chassis ground:
(B54) No. 14 — Chassis ground:
2
CHECK HARNESS CONNECTOR BETWEEN
TCM AND CHASSIS GROUND.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B54) No. 17 — Chassis ground:
(B55) No. 8 — Chassis ground:
3
CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect all the connectors.
2) Turn the ignition switch to ON. (engine
OFF)
3) Check input signal of H&LR/C oil pressure
SW.
4
CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Turn the ignition switch to OFF.
2) Turn the ignition switch to ON. (engine ON)
3) Drive the vehicle on 2nd speed of "D" range
with checking current gear position using Sub-
aru Select Monitor.
4) Check input signal of H&LR/C oil pressure
SW.
5
CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Turn the ignition switch to OFF.
2) Turn the ignition switch to ON. (engine ON)
3) Shift to "D" range and brake ON (1st) with
checking current gear position using Subaru
Select Monitor.
4) Check input signal of H&LR/C oil pressure
SW.
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is OFF displayed?
Is OFF displayed?
Is ON displayed?
5AT(diag)-73
Yes
Go to step 2.
Repair the open
circuit of harness
between TCM and
transmission con-
nector.
Go to step 3.
Repair the short
circuit of harness
between TCM and
transmission con-
nector.
Go to step 4.
Go to step 7.
Go to step 5.
Replace the con-
trol valve body.
<Ref. to 5AT-58,
Control Valve
Body.>
Even if the SPORT
Go to step 6.
indicator lights
blinks, the system
is in normal condi-
tion. A temporary
poor contact of
connector or har-
ness may be the
cause. Repair the
poor contact of
harness in the
solenoid output
and oil pressure
SW input.
No
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