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 connector and transmission connector.
Connector & terminal
(B54) No. 6 — (B11) No. 7:
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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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2.CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION.
Measure the resistance of the harness connector between TCM connector and chassis ground.
Connector & terminal
(B54) 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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3.CHECK HIGH CLUTCH 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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4.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 high clutch duty solenoid using Subaru Select Monitor.
NOTE:
High clutch duty solenoid is indicated in “%”.
7) Shift the select lever to “D” range, and slowly increase vehicle speed to measure at 3rd or 4th.
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 or VDC clear memory of on-board diagnostics system. 
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Is the measured value 0%?
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5.CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR.
Return the engine to idling speed and shift the select lever to “N” range.
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 or VDC clear memory of on-board diagnostics system.
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Is the measured value 100%?
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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 high clutch duty solenoid circuit?
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Replace the TCM.
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7.CHECK HIGH CLUTCH DUTY SOLENOID (IN TRANSMISSION).
1) Remove the transmission connector from bracket.
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 high clutch duty solenoid.
4) Measure the resistance between high clutch duty solenoid connector and transmission ground.
Connector & terminal
(AT12) No. 3 — 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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8.CHECK HARNESS CONNECTOR BETWEEN HIGH CLUTCH DUTY SOLENOID AND TRANSMISSION.
Measure the resistance of harness between high clutch duty solenoid and transmission connector.
Connector & terminal
(T4) No. 7 — (AT12) No. 3:
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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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9.CHECK HARNESS CONNECTOR BETWEEN HIGH CLUTCH DUTY SOLENOID AND TRANSMISSION.
Measure the resistance of harness between transmission connector and transmission ground.
Connector & terminal
(T4) No. 7 — 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 high clutch duty solenoid and transmission.
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Repair the short circuit of harness between high clutch duty solenoid and transmission connector.
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