DTC P1706 At Vehicle Speed Sensor Circuit Malfunction (Rear Wheel): 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 (AT Vehicle 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. 23 - (B12) No. 5: (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. 23 - 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 variation between TCM connector terminals. Connector & terminal (B12) No. 5 (+) - (B11) No. 2 (-):	Is the voltage 4 - 6 V?	Go to step 7 .	Go to step 6 .
6 CHECK HARNESS ASSEMBLY (TURBINE SPEED SENSOR GROUND). Check the installing condition of ground connecting harness (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 connector terminals not damaged?	Go to step 7 .	When the poor installation of ground connecting harness, install it securely. Replace the transmission assembly when the harness is damaged. Refer to AUTOMATIC TRANSMISSION ASSEMBLY .
7 CHECK INPUT SIGNAL FOR TCM. Connect all connectors. Lift up the vehicle. Start the engine. Read the data of «Rear Wheel Speed» 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 .	Does the speedometer indication in the combination meter change according to «Rear Wheel Speed» data?	Check for poor contact of rear vehicle speed sensor circuit harness, and repair the defective part.	Replace the transmission harness assembly.