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Diagnostic Procedure

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND ATF TEMPERATURE SENSOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from TCM.
  3. Measure the resistance between TCM connector terminals.

    Connector & terminal 

    (B55) No. 23 - No. 12: 

 Is the resistance 500 Ω or more? Go to step 2  . Go to step 4  .
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND ATF TEMPERATURE SENSOR. 
Measure the resistance of harness between TCM connector and chassis ground.
Connector & terminal 
(B55) No. 23 - Chassis ground: 		 Is the resistance 1 MΩ or more? Go to step 3  . Go to step 4  .
3 CHECK HARNESS. 
Measure the resistance between TCM connector terminals while shaking the harness.
Connector & terminal 
(B55) No. 23 - No. 12: 		 Does the resistance change? Go to step 4  . Replace the TCM. < Refer to TRANSMISSION CONTROL MODULE (TCM) . >
4 CHECK HARNESS CONNECTOR BETWEEN TCM AND ATF TEMPERATURE SENSOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from transmission.
  3. Measure the resistance of harness between TCM connector and chassis ground.

    Connector & terminal 

    (B55) No. 12 - Chassis ground: 

    (B55) No. 23 - Chassis ground: 

 Is the resistance 1 MΩ or more? Go to step 5  . Repair the short circuit of harness between TCM and transmission harness.
5 CHECK HARNESS CONNECTOR TO ATF TEMPERATURE SENSOR. 
Measure the resistance between transmission connector terminals.
Connector & terminal 
(T4) No. 11 - No. 15: 		 Is the resistance 500 Ω or more? Check short circuits in harnesses or connectors, and repair the defective part. Go to step 6  .
6 CHECK TRANSMISSION HARNESS. 
  1. Lift up the vehicle.
  2. Drain the automatic transmission fluid.
    CAUTION: Do not drain ATF until it cools down.
  3. Remove the oil pan.
  4. Disconnect the harness connector from the control valve body.
  5. Measure the resistance between transmission connector and transmission ground.

    Connector & terminal 

    (T4) No. 11 - Transmission ground: 

    (T4) No. 15 - Transmission ground: 

 Is the resistance 1 MΩ or more? Go to step 7  . Replace the transmission harness.
7 CHECK ATF TEMPERATURE SENSOR. 
Measure the resistance between control valve connector terminals.
Connector & terminal 
(AT2) No. 4 - No. 9: 		 Is the resistance 500 Ω or more? Check short circuits in harnesses or connectors, and repair the defective part. Replace the control valve body. < Refer to CONTROL VALVE BODY . >
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