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

G06654820

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSIS PROCEDURE

Step	Check	Yes	No
1 CHECK TCM I/O SIGNAL. Check I/O signal of power supply and ground. Ref. to ELECTRICAL SPECIFICATION , Transmission Control Module (TCM) 1/O Signal.	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. 24 - (B11) No. 1: (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 connector 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. 24 - Chassis ground:	Is the resistance 1 MΩ or more?	Go to step 4 .	Repair the short circuit of harness between TCM connector 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. Ref. to TRANSMISSION CONTROL MODULE (TCM) .
5 CHECK TURBINE SPEED SENSOR FOR TCM. Measure the voltage change between TCM connector terminals. Connector & terminal (B11) No. 1 (+) - (B11) No. 2 (-):	Is the voltage 4 - 6 V?	Go to step 6 .	Replace the TCM. Ref. to TRANSMISSION CONTROL MODULE (TCM) .
6 CHECK INPUT SIGNAL FOR TCM. Connect all connectors. Lift up the vehicle. Start the engine. Read the data of "Front Wheel Speed" using Subaru Select Monitor. Ref. 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 illuminates, delete the ABS or VDC memory after completing the AT control diagnosis. Ref. to CLEAR MEMORY MODE .	Does the speedometer indication increase as "Front Wheel Speed" data increases?	Check for poor contact of the harness between the ATF temperature sensor and transmission connector, and repair the fault location.	Go to step 7 .
7 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. Turn the ignition switch to OFF. Disconnect the connector from transmission. Remove the transmission connector from bracket. Lift up the vehicle. Drain the ATF. CAUTION: Do not drain ATF until it cools down. Remove the oil pan. Disconnect the control valve body connector. Measure the resistance between transmission connector and control valve body connector. Connector & terminal (T4) No. 1 - (T10) No. 2:	Is the resistance less than 1 Ω?	Go to step 8 .	Repair the open circuit of harness between control valve body connector and transmission connector.
8 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T10) No. 2 - Transmission ground:	Is the resistance 1 MΩ or more?	Go to step 9 .	Repair the short circuit of harness between transmission connector and transmission ground.
9 CHECK HARNESS CONNECTOR BETWEEN CONTROL VALVE BODY AND VEHICLE SPEED SENSOR. Disconnect the connector from vehicle speed sensor. Measure the resistance of harness between control valve body connector and vehicle speed sensor connector. Connector & terminal (T10) No. 2 - (T15) No. 2: (T14) No. 1 - (T15) No. 3: (T14) No. 4 - (715) No. 1:	Is the resistance less than 1 Ω?	Go to step 10 .	Replace the control valve body. Ref. to CONTROL VALVE BODY .
10 CHECK HARNESS CONNECTOR BETWEEN CONTROL VALVE BODY AND VEHICLE SPEED SENSOR. Measure the resistance of harness between control valve body connector and transmission ground. Connector & terminal (T10) No. 2 - Transmission ground:	Is the resistance 1 MΩ or more?	Replace the vehicle speed sensor.	Replace the control valve body. Ref. to CONTROL VALVE BODY .