DTC P0720 Output Speed Sensor Circuit: Wiring Diagram

WARNING: This page is about a different variant/trim than selected.

Fig 1: Output Speed Sensor Circuit Wiring Diagram (DTC P0720)

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK FUSE. Turn the ignition switch to OFF. Remove the fuse (No. 38).	Is the fuse OK?	Go to step 2 .	Replace the fuse. If the fuse blows out easily, repair the short circuit of harness.
2 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance between TCM connector and transmission connectors. Connector & terminal (B54) No. 1 - (B11) No. 13: (B54) No. 20 - (B11) No. 12: (M/B No. 38) No. 2 - (B11) No. 7:	Is the resistance less than 1 Ω?	Go to step 3 .	Repair the open circuit of harness.
3 CHECK HARNESS. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B11) No. 7 - Chassis ground: (B11) No. 12 - Chassis ground:	Is the resistance 1 MΩ or more?	Go to step 4 .	Repair the short circuit of harness.
4 CHECK TRANSMISSION HARNESS. Connect the TCM connector. Turn the ignition switch to ON. Measure the voltage between transmission connector and chassis ground. Connector & terminal (B11) No. 12 (+) - Chassis ground (-): NOTE: Delete the TCM memory after completing the CVT control system diagnosis. Refer to , CLEAR MEMORY MODE .	Is the voltage approx. 5 V?	Go to step 5 .	Repair the open circuit of harness or poor contact of connector.
5 CHECK INPUT SIGNAL FOR TCM. Turn the ignition switch to OFF. Connect the transmission connector. Lift up the vehicle. Start the engine. Slowly increase the speed to 30 km/h (18 MPH). Read the data of "Front Wheel Speed" using Subaru Select Monitor.	Does the value of "Front Wheel Speed" change according to the engine speed?	Current condition is normal. Repair the poor contacts of harnesses of front wheel speed sensor and transmission connector.	Go to step 6 .
6 CHECK TRANSMISSION HARNESS. Turn the ignition switch to OFF. Disconnect the transmission connector. Lift up the vehicle. Disconnect the front wheel speed sensor connector. Measure the resistance between transmission connector and front wheel speed sensor connector. Connector & terminal (T4) No. 7 - (AT5) No. 1: (T4) No. 12 - (AT5) No. 2: (T4) No. 13 - (AT5) No. 3:	Is the resistance less than 1 Ω?	Replace the front wheel speed sensor. Refer to FRONT WHEEL SPEED SENSOR .	Replace the transmission harness.