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 — 6.0 Ω?
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4.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 “High Clutch Duty Ratio” using Subaru Select Monitor.
8) Shift the select lever to “D”, and slowly increase vehicle speed to measure at 3rd or 4th.
NOTE:
A speed difference between front and rear wheels causes the ABS 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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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 lights the ABS warning light or the VDC warning light, 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 100%?
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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 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 control valve body.
4) Measure the resistance between high clutch duty solenoid connector and transmission ground.
Connector & terminal
(AT2) No. 3 — 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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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 — (AT2) 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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The circuit is normal.
If the ATF temperature warning light is flashing, repair the harness or connector between the 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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