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DTC P0720 Output Speed Sensor Circuit: Wiring Diagram

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Output Speed Sensor Wiring Diagram
G07665847Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTIC PROCEDURE CHART

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 the harness between TCM connector and transmission connector.

    Connector & terminal 

    (B55) No. 16 - (B11) No. 18: 

    (B55) No. 27 - (B11) No. 14: 

 Is the resistance less than 1 Ω? Go to step 2.  Repair the open circuit of harness between TCM and transmission connector, and poor contact of the connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. 
Measure the resistance of the harness between TCM connector and chassis ground.
Connector & terminal 
(B55) No. 16 - Chassis ground: 
(B55) No. 27 - Chassis ground: 		 Is the resistance 1 MΩ or more Go to step 3.  Repair the short circuit of the harness and poor contact of connectors between the TCM and chassis ground.
3 CHECK FRONT VEHICLE SPEED SENSOR. 
Measure the resistance between transmission connector receptacle's terminals.
Connector & terminal 
(T4) No. 14 - No. 18: 		 Is the resistance between 450 - 650 Ω? Go to step 4.  Replace the front vehicle speed sensor. < Ref. to FRONT VEHICLE SPEED SENSOR . >
4 CHECK INPUT SIGNAL FOR TCM. 
  1. Connect all connectors.
  2. Connect the Subaru Select Monitor to data link connector.
  3. Lift up the vehicle.
  4. Turn the ignition switch to ON.
  5. Run the Subaru Select Monitor.
  6. Start the engine.
  7. Slowly increase the vehicle speed to 60 km/h (37 MPH).
  8. Read the data of "Front Wheel Speed" using Subaru Select Monitor. (Compare the speedometer with Subaru Select Monitor indications.)
    NOTE: The speed difference between the front and rear wheels will illuminate the ABS warning light or VDC warning light, but this does not indicate a malfunction. If the warning light illuminates, delete the ABS or VDC memory after completing the AT control diagnosis. < Ref. to CLEAR MEMORY MODE . >
 Does the speedometer indication increase as the Subaru Select Monitor data increases? Check for poor contact of the front vehicle speed sensor circuit harness and repair the fault location. Go to step 5  .
5 CHECK FOR POOR CONTACT.  Is there poor contact of front vehicle speed sensor circuit? Repair the poor contact. Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
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