DTC P0715 Input/Turbine Speed Sensor Circuit: Wiring Diagram

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

AT Control System. Refer to appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: AT Control System - Wiring Diagram (Input/Turbine Speed Sensor)

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK TCM I/O SIGNAL. Check the power supply and ground I/O signals. Refer to ELECTRICAL SPECIFICATION .	Is TCM I/O signal OK?	Go to step 2 .	Repair the open or short circuit for power supply and ground.
2 CHECK TCM AND TRANSMISSION HARNESS CONNECTOR. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B55) No. 16 - (B11) No. 2: (B55) No. 26 - (B12) No. 7: (B55) No. 27 - (B11) No. 7:	Is the resistance less than 1 Ω?	Go to step 3 .	Repair the open circuit of harness between TCM and transmission connector.
3 CHECK TCM AND TRANSMISSION HARNESS CONNECTOR. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B55) No. 16 - Chassis ground: (B55) No. 26 - Chassis ground: (B55) No. 27 - Chassis ground:	Is the resistance 1 MΩ or more?	Go to step 4 .	Repair the short circuit of harness between TCM and transmission connector.
4 CHECK TCM POWER SUPPLY OUTPUT. Connect the connector to TCM. (Transmission connector is disconnected) Turn the ignition switch to ON. Measure the voltage between transmission connector and chassis ground. Connector & terminal (B11) No. 7 (+) - Chassis ground (-):	Is the voltage 10 - 13 V?	Go to step 5 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
5 CHECK INPUT CIRCUIT OF TCM TURBINE SPEED SENSOR. Measure the voltage between TCM connector terminals. Connector & terminal (B12) No. 7 (+) - (B11) No. 2 (-):	Is the voltage 4 - 6 V?	Go to step 6 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
6 CHECK HARNESS ASSEMBLY (TURBINE SPEED SENSOR GROUND). Check the installing condition of ground connecting harness of harness assembly (used for both of turbine speed sensor 1, rear vehicle speed sensor).	Is the ground connecting harness installed to transmission body correctly, or the harness and terminals not damaged?	Go to step 7 .	When poor installation of ground occurs, install it securely. Replace the transmission assembly if the harness or terminal is damaged. Refer to AUTOMATIC TRANSMISSION ASSEMBLY .
7 CHECK HARNESS ASSEMBLY. Turn the ignition switch to OFF. Disconnect the connector from transmission. Disconnect the connector from turbine speed sensor 1. Measure the resistance between transmission connector and turbine speed sensor 1 connector. Connector & terminal (T3) No. 7 - (AT1) No. 2: (T4) No. 7 - (AT1) No. 3: (T4) No. 2 - (AT1) No. 1:	Is the resistance less than 1 Ω?	Go to step 8 .	Repair the open circuit of the harness or poor contact of the connector between the transmission connector and turbine speed sensor 1 connector.
8 CHECK HARNESS ASSEMBLY. Measure the resistance between transmission connector and chassis ground. Connector & terminal (T3) No. 7 - Chassis ground: (T4) No. 7 - Chassis ground: (T4) No. 2 - Chassis ground:	Is the resistance 1 MΩ or more?	Go to step 9 .	Repair the short circuit of the harness between the transmission connector and turbine speed sensor 1 connector.
9 CHECK INPUT SIGNAL FOR TCM. Connect all connectors. Lift up the vehicle. Start the engine. Drive at 4th of manual mode. NOTE: Turbine speed sensor 1 signal can be measured only on 4th speed. Read the data of «AT Turbine Speed 1» and «AT Turbine Speed 2» using Subaru Select Monitor. Refer to READ CURRENT DATA . 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 memory of ABS or VDC after completing AT control diagnosis. Refer to CLEAR MEMORY MODE .	Are the values of «AT Turbine Speed 1» and «AT Turbine Speed 2» almost the same?	Check for poor contact of the harness of the turbine speed sensor 1 circuit, and repair the faulty part.	Replace the turbine speed sensor 1. Refer to TURBINE SPEED SENSOR 1 .