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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 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. 5 - (B11) No. 8: 

 Is the resistance less than 1 Ω? Go to step 2  . Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. 
Measure the resistance of the harness connector between TCM connector and chassis ground.
Connector & terminal 
(B55) No. 5 - Chassis ground: 		 Is the resistance 1 MΩ or more? Go to step 3  . Repair the short circuit of harness between TCM and transmission connector.
3 CHECK TRANSFER DUTY SOLENOID. 
Measure the resistance between transmission connector terminals.
Connector & terminal 
(T4) No. 8 - No. 20: 		 Is the resistance 2.0 - 6.0 Ω? Go to step 4  . Go to step 7  .
4 CHECK OUTPUT SIGNAL OF TCM. 
  1. Connect the connectors to TCM and transmission.
  2. Connect the Subaru Select Monitor to data link connector.
  3. Turn the ignition switch to ON.
  4. Run the Subaru Select Monitor.
  5. Shift the select lever to the "N" range, and fully close the throttle pedal. (Vehicle speed is 0 km/h (0 MPH))
  6. Read the data of «Transfer Duty Ratio» using Subaru Select Monitor.
 Is the value approx. 5%? Go to step 5  . Go to step 6  .
5 CHECK OUTPUT SIGNAL OF TCM. 
  1. Set the select lever to "D" range.
  2. Read the data of «Transfer Duty Ratio» using Subaru Select Monitor.
 Is the measured value approx. 18 - 35%? Check the harnesses or connectors between TCM and transmission, and repair the defective part. Go to step 6  .
6 CHECK FOR POOR CONTACT.  Is there poor contact of transfer duty solenoid circuit? Repair the poor contact. Replace the TCM. < Refer to TRANSMISSION CONTROL MODULE (TCM) . >
7 CHECK TRANSFER 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.
  4. Disconnect the connector from the control valve body.
  5. Measure the resistance between transfer duty solenoid connector and transmission ground.

    Connector & terminal 

    (AT2) No. 7 - Transmission ground: 

 Is the resistance 2.0 - 6.0 Ω? Go to step 8  . Replace the control valve body. < Refer to CONTROL VALVE BODY . >
8 CHECK HARNESS CONNECTOR BETWEEN TRANSFER DUTY SOLENOID AND TRANSMISSION. 
Measure the resistance of harness between transfer duty solenoid and transmission connector.
Connector & terminal 
(T4) No. 8 - (AT2) No. 7: 		 Is the resistance less than 1 Ω? Go to step 9  . Repair the open circuit of harness between transfer duty solenoid and transmission connector.
9 CHECK HARNESS CONNECTOR BETWEEN TRANSFER DUTY SOLENOID AND TRANSMISSION. 
Measure the resistance of harness between transmission connector and transmission ground.
Connector & terminal 
(T4) No. 8 - Transmission ground: 		 Is the resistance 1 MΩ or more? Check the connectors and harnesses between transfer duty solenoid and transmission for poor contact, and repair the defective part. Repair short circuit of the harness between the transfer duty solenoid and transmission connector.
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