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. 4 — (B11) 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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2.CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND.
Measure the resistance of harness between TCM connector and chassis ground.
Connector & terminal
(B54) No. 4 — 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 2-4 BRAKE DUTY SOLENOID.
Measure the resistance between transmission connector 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 all connectors.
2) Connect the Subaru Select Monitor to the data link connector.
3) Start the engine, and turn the Subaru Select Monitor power switch to ON.
4) Warm-up the transmission until the ATF temperature exceeds approximately 80°C (176°F).
NOTE:
If the ambient temperature falls below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature.
5) Stop the engine and turn the ignition switch to ON (with engine OFF).
6) Move the select lever to “N”.
7) While depressing the accelerator pedal, read the data of 2-4 brake duty solenoid using Subaru Select Monitor.
NOTE:
2-4 brake duty solenoid is indicated in “%”.
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Is the measured value 100%?
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5.CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR.
1) Move the select lever to “2” range.
2) Turn the hold switch to ON.
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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 2-4 brake duty solenoid circuit?
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Replace the TCM. 
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7.CHECK 2-4 BRAKE 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 2-4 brake duty solenoid.
4) Measure the resistance of harness between 2-4 brake duty solenoid connector and transmission ground.
Connector & terminal
(AT12) No. 6 — 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 2-4 BRAKE DUTY SOLENOID AND TRANSMISSION.
Measure the resistance of harness between 2-4 brake duty solenoid and transmission connector.
Connector & terminal
(T4) No. 3 — (AT12) No. 6:
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Is the resistance less than 1 Ω?
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Repair the open circuit of harness between 2-4 brake duty solenoid and transmission connector.
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9.CHECK HARNESS CONNECTOR BETWEEN 2-4 BRAKE DUTY SOLENOID AND TRANSMISSION.
Measure the resistance of harness between transmission connector and transmission ground.
Connector & terminal
(T4) No. 3 — 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 2-4 brake duty solenoid and transmission connector.
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