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Are DTCs other than P0743 displayed?
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Perform the diagnosis according to DTC.
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2.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 connector and transmission connector.
Connector & terminal
(B55) No. 6 — (B11) No. 12:
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Is the resistance less than 1 Ω?
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Repair the open circuit of harness between TCM and transmission connector.
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3.CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION.
Measure the resistance of the harness connector between TCM connector and chassis ground.
Connector & terminal
(B55) No. 6 — Chassis ground:
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Is the resistance 1 MΩ or more?
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Repair the short circuit of harness between TCM and transmission connector.
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4.CHECK LOCK-UP DUTY SOLENOID.
Measure the resistance between transmission connector receptacle’s terminals.
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Is the resistance between 2.0 — 6.0 Ω?
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5.CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR.
1) Connect the connectors to TCM and transmission.
3) Connect the Subaru Select Monitor to the data link connector.
5) Run the Subaru Select Monitor.
6) Warm-up the engine until the ATF temperature exceeds 80°C (176°F).
NOTE:
If the ambient temperature is below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature.
7) Read the data of “Lock Up Duty Ratio” using Subaru Select Monitor.
8) Shift the select lever to “D” range, and slowly increase vehicle speed to 60 km/h (37 MPH).
NOTE:
A speed difference between front and rear wheels causes the ABS warning light or the VDC warning light to illuminate, but this does not indicate a malfunction. If the warning light is illuminated, clear the ABS and VDC memories of the on-board diagnostic system after completing AT control diagnosis. 
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Is the measured value 95%?
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6.CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR.
Return the engine to idling speed, shift the select lever to “N” range and read the data.
NOTE:
A speed difference between front and rear wheels causes the ABS warning light or the VDC warning light to illuminate, but this does not indicate a malfunction. If the warning light is illuminated, clear the ABS and VDC memories of the on-board diagnostic system after completing AT control diagnosis.
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Is the measured value 0%?
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The circuit is normal.
If the ATF temperature warning light is flashing, repair the harnesses or connectors between TCM and transmission.
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Is there poor contact in lock-up duty solenoid circuit?
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Replace the TCM.
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8.CHECK LOCK-UP DUTY SOLENOID (IN TRANSMISSION).
1) Disconnect the transmission connector.
2) Drain the automatic transmission fluid.
CAUTION:
Do not drain ATF until it cools down.
3) Remove the oil pan, and disconnect the connector from control valve body.
4) Measure the resistance between lock-up duty solenoid and transmission ground.
Connector & terminal
(AT2) No. 6 — Transmission ground:
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Is the resistance between 2.0 — 6.0 Ω?
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Replace the control valve body.
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9.CHECK HARNESS CONNECTOR BETWEEN LOCK-UP DUTY SOLENOID AND TRANSMISSION.
Measure the resistance of harness between lock-up duty solenoid and transmission connector.
Connector & terminal
(T4) No. 12 — (AT2) No. 6:
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Is the resistance less than 1 Ω?
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Repair the open circuit of harness between TCM and transmission connector.
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10.CHECK HARNESS CONNECTOR BETWEEN LOCK-UP DUTY SOLENOID AND TRANSMISSION.
Measure the resistance of harness between transmission connector and transmission ground.
Connector & terminal
(T4) No. 12 — Transmission ground:
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Is the resistance 1 MΩ or more?
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The circuit is normal.
If the ATF temperature warning light is flashing, repair the harness or connector between the lock-up duty solenoid and transmission.
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Repair the short circuit of harness between lock-up duty solenoid and transmission connector.
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