1.CHECK FOR ANY OTHER DTC ON DISPLAY.
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Is any other DTC 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 — 4.5 Ω?
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5.CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR.
1) Connect the connectors to TCM and transmission.
2) Lift up the vehicle and place it on rigid racks.
NOTE:
Raise all wheels off the floor.
3) Connect the Subaru Select Monitor to the data link connector.
4) Start the engine, and turn the Subaru Select Monitor power switch to ON.
5) Start the engine and 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.
6) Read the data of lock-up duty solenoid using the Subaru Select Monitor.
• Lock-up duty solenoid is indicated in “%”.
7) Shift the select lever to “D,” and slowly increase vehicle speed to 60 km/h (37 MPH).
NOTE:
The speed difference between front and rear wheels may illuminate the ABS warning light, but this does not indicate a malfunction. When AT control diagnosis is finished, perform the ABS diagnostics Clear Memory Mode. 
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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.
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Is the measured value 0%?
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Even if the power indicator light is blinking, the circuit is in normal condition at this time. A temporary poor contact of connector or harness may be the cause. Repair the harness or connector in 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 lock-up duty solenoid.
4) Measure the resistance between lock-up duty solenoid and transmission ground.
Connector & terminal
(AT12) No. 4 — Transmission ground:
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Is the resistance between 2.0 — 4.5 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 — (AT12) No. 4:
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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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Even if the power indicator light is blinking, the circuit is in normal condition at this time. A temporary poor contact of connector or harness may be the cause. Repair the harness or connector in 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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