Automatic Transaxle (5AT) (Diagnostics): Wiring — Subaru Outback BS (2014-2018)

WIRING DIAGRAM

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

Scheme 815

Scheme 815: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK INSTALLATION OF TCM CONNECTOR. Turn the ignition switch to OFF.	Is TCM connector connected to TCM?	Go to step 2 .	Connect the TCM connector to TCM.
2 CHECK SUBARU SELECT MONITOR POWER SUPPLY CIRCUIT. Measure the voltage between data link connector and chassis ground. Connector & terminal (B40) No. 16 (+) - Chassis ground (-)	Is the voltage 10 V or more?	Go to step 3 .	Repair harness connector between the battery and data link connector, and poor contact of the connector.
3 CHECK SUBARU SELECT MONITOR GROUND CIRCUIT. Measure the resistance of harness between data link connector and chassis ground. Connector & terminal (B40) No. 4 - Chassis ground: (B40) No. 5 - Chassis ground	Is the resistance less than 1 ohms?	Go to step 4 .	Repair the open circuit of harness between data link connector and ground terminal, and poor contact of connector.
4 CHECK COMMUNICATION OF SUBARU SELECT MONITOR. Turn the ignition switch to ON. Check communication with the transmission system.	Is the name of system displayed on Subaru Select Monitor?	Go to step 9 .	Go to step 5 .
5 CHECK COMMUNICATION OF SUBARU SELECT MONITOR. Turn the ignition switch to OFF. Disconnect the TCM connector. Turn the ignition switch to ON. Check communication with the engine system.	Is the name of system displayed on Subaru Select Monitor?	Go to step 7 .	Go to step 6 .
6 CHECK COMMUNICATION OF SUBARU SELECT MONITOR. Turn the ignition switch to OFF. Connect the TCM connector. Disconnect the ECM connector. Turn the ignition switch to ON. Check communication with the transmission system.	Is the name of system displayed on Subaru Select Monitor?	Inspect the ECM.	Go to step 7 .
7 CHECK HARNESS CONNECTOR BETWEEN EACH CONTROL MODULE AND DATA LINK CONNECTOR. Turn the ignition switch to OFF. Disconnect the TCM and ECM connector. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B40) No. 7 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 8 .	Check harness and connector between each control module and data link connector.
8 CHECK OUTPUT SIGNAL OF TCM. Turn the ignition switch to ON. Measure the voltage between TCM and chassis ground. Connector & terminal (B40) No. 7 (+) - Chassis ground (-)	Is the voltage 1 V or more?	Check harness and connector between each control module and data link connector.	Go to step 9 .
9 CHECK HARNESS CONNECTOR BETWEEN TCM AND DATA LINK CONNECTOR. Measure the resistance between TCM connector and data link connector. Connector & terminal (B54) No. 8 - (B40) No. 7	Is the resistance less than 1 ohms?	Go to step 10 .	Check the harness and connector between TCM and data link connector.
10 CHECK INSTALLATION OF TRANSMISSION HARNESS CONNECTOR.	Is the transmission harness connector connected to bulkhead harness connector?	Go to step 11 .	Connect the bulkhead harness connector to transmission harness connector.
11 CHECK POOR CONTACT OF CONNECTORS.	Is there poor contact of control module power supply and data link connector?	Repair the poor contact.	Go to step 12 .
12 CHECK POWER SUPPLY OF TCM. Disconnect the connector from TCM. Turn the ignition switch to ON. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B54) No. 24 (+) - Chassis ground (-): (B54) No. 25 (+) - Chassis ground (-): (B54) No. 26 (+) - Chassis ground (-)	Is the voltage 10 - 13 V?	Go to step 15 .	Go to step 13 .
13 CHECK M/B FUSE. Turn the ignition switch to OFF. Remove the fuse (No. 16 and No. 17).	Is the fuse blown out?	Replace the fuse.	Go to step 14 .
14 CHECK HARNESS. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B54) No. 24 - Chassis ground: (B54) No. 25 - Chassis ground: (B54) No. 26 - Chassis ground	Is the resistance 10 ohms or less?	Replace the fuse. If the replaced fuse has blown out easily, repair short circuit of harness between fuse and TCM.	Go to step 15 .
15 CHECK IGNITION POWER SUPPLY CIRCUIT. Turn the ignition switch to ON. Measure the ignition power supply voltage between TCM connector and chassis ground. Connector & terminal (B54) No. 18 (+) - Chassis ground (-): (B54) No. 19 (+) - Chassis ground (-)	Is the voltage 10 - 13 V?	Go to step 17 .	Go to step 16 .
16 CHECK F/B FUSE. Remove the fuse (No. 12).	Is the fuse blown out?	Replace the fuse. If the replaced fuse has blown out easily, repair short circuit of harness between fuse and TCM.	Go to step 17 .
17 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connector from TCM. Measure the resistance of the harness between TCM and transmission ground. Connector & terminal (B54) No. 22 - Transmission ground: (B54) No. 23 - Transmission ground	Is the resistance 1 Mohms or more?	Repair the short circuit of harness between TCM and transmission harness connector, and poor contact of connector.	Go to step 18 .
18 CHECK POOR CONTACT OF CONNECTORS.	Is there poor contact of TCM power supply, ground and data link connector?	Repair the connector.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .

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

Scheme 816

Scheme 816: WIRING DIAGRAM

DIAGNOSTIC PROCEDURE Step Check Yes No 1 CHECK DTC OF TCM. Is DTC of AT CAN communication circuit displayed? Perform the diagnosis according to DTC. Go to step 2 . 2 CHECK INHIBITOR SWITCH. Using Subaru Select Monitor, read the data of «Inhibitor SW 1» - «Inhibitor SW 4» for each range. Is the display as in the table of step 2? Go to step 9 . Go to step 3 . 3 CHECK INHIBITOR SWITCH. Using Subaru Select Monitor, read the data of «Inhibitor SW 1» for "P" and "D" ranges. Is the display "High" for both "P" and "D"? Go to step 4 . Go to step 7 . 4 CHECK INHIBITOR SWITCH. Using Subaru Select Monitor, read the data of «Inhibitor SW 2» for "R" and "D" ranges. Is the display "High" for both "R" and "D"? Go to step 5 . Go to step 7 . 5 CHECK INHIBITOR SWITCH. Using Subaru Select Monitor, read the data of «Inhibitor SW 3» for "N" and "D" ranges. Is the display "High" for both "N" and "D"? Go to step 6 . Go to step 7 . 6 CHECK INHIBITOR SWITCH. Using Subaru Select Monitor, read the data of «Inhibitor SW 4» for "P" and "N" ranges. Is the display "High" for both "P" and "N"? Go to step 8 . Go to step 7 . 7 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B55) No. 8 - (B12) No. 4: (B55) No. 9 - (B12) No. 3: (B55) No. 10 - (B12) No. 2: (B55) No. 11 - (B12) No. 1: Is the resistance less than 1 ohms? Go to step 8 . Repair the open circuit of harness between TCM and transmission connector. 8 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B55) No. 8 - Chassis ground: (B55) No. 9 - Chassis ground: (B55) No. 10 - Chassis ground: (B55) No. 11 - Chassis ground: Is the resistance 1 Mohms or more? Go to step 9 . Repair the short circuit of harness between TCM and transmission connector. 9 CHECK INPUT SIGNAL CIRCUIT FOR TCM. Turn the ignition switch to OFF. Disconnect the transmission connector (B12). Connect the TCM connector. Turn the ignition switch to ON. Measure the voltage between TCM terminals. Connector & terminal (B55) No. 8 (+) - (B54) No. 23 (-): (B55) No. 9 (+) - (B54) No. 23 (-): (B55) No. 10 (+) - (B54) No. 23 (-): (B55) No. 11 (+) - (B54) No. 23 (-): Is the voltage of «Inhibitor SW 1» - «Inhibitor SW 4» 8 V or more? Go to step 11 . Go to step 10 . 10 CHECK TCM I/O SIGNAL. Check the power supply and ground I/O signals. Refer to ELECTRICAL SPECIFICATION . Is TCM I/O signal OK? Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) . Repair the open or short circuit for power supply and ground. 11 CHECK INPUT SIGNAL FOR TCM. Connect all connectors. Lift up the vehicle. Start the engine. Read the data of «Front Wheel Speed» 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 . Does the speedometer indication increase as «Front Wheel Speed» and «AT Turbine Speed 2» values increase? Go to step 12 . Replace the control valve body. Refer to CONTROL VALVE BODY . 12 CHECK INPUT SIGNAL FOR TCM. Drive at 4th of manual mode. NOTE: Turbine speed sensor 1 signal can be measured only on 4th speed. Read the data of «Rear Wheel Speed» and «AT Turbine Speed 1» 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 increase as «Rear Wheel Speed» and «AT Turbine Speed 1» values increase? Go to step 13 . Repair the open circuit of harness or poor contact of connector between TCM and rear vehicle speed sensor and turbine speed sensor 1. 13 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 connector from control valve body connector. Measure the resistance between transmission connector and control valve body connector. Connector & terminal (T3) No. 4 - (T14) No. 2: (T3) No. 3 - (T14) No. 3: (T3) No. 2 - (T14) No. 5: (T3) No. 1 - (T14) No. 6: Is the resistance less than 1 ohms? Go to step 14 . Repair the open circuit of harness between control valve body connector and transmission connector. 14 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T14) No. 2 - Transmission ground: (T14) No. 3 - Transmission ground: (T14) No. 5 - Transmission ground: (T14) No. 6 - Transmission ground: Is the resistance 1 Mohms or more? Go to step 15 . Repair the short circuit of harness between control valve body connector and transmission connector. 15 CHECK FOR POOR CONTACT. Is there any poor contact of «Inhibitor SW 1» - «Inhibitor SW 4» monitor circuit? Repair the poor contact. Replace the control valve body. Refer to CONTROL VALVE BODY

Scheme 817

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

Scheme 818

Scheme 818: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B55) No. 17 - (B11) No. 5: (B55) No. 18 - (B11) No. 12	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK ATF TEMPERATURE SENSOR. Turn the ignition switch to OFF. Connect the connectors to transmission and TCM. Start the engine. Warm up the transmission until the ATF temperature exceeds 80°C (176°F). Disconnect the connector from transmission. Measure the resistance between transmission connector terminals. Connector & terminal (T4) No. 5 - (T4) No. 12	Is the resistance 300 - 800 ohms?	Go to step 3 .	Go to step 5 .
3 CHECK ATF TEMPERATURE SENSOR. Measure the resistance between transmission connector terminals. Connector & terminal (T4) No. 5 - (T4) No. 12	Does the resistance value increase while the ATF temperature decreases?	Go to step 4 .	Go to step 5 .
4 CHECK INPUT SIGNAL FOR TCM. Connect the connector. Turn the ignition switch to ON. Read the data of «ATF Temp.» using the Subaru Select Monitor.	Does the ATF temperature gradually decrease?	Check for poor contact of the harness between the ATF temperature sensor and transmission connector, and repair the defective part.	Go to step 6 .
5 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. 5 - (T10) No. 3: (T4) No. 12 - (T10) No. 4	Is the resistance less than 1 ohms?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Repair the open circuit of harness between transmission connector and control valve body connector.
6 CHECK FOR POOR CONTACT.	Is there poor contact of ATF temperature sensor circuit?	Repair the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B55) No. 17 - Chassis ground: (B55) No. 18 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 2 .	Repair the short circuit of harness between TCM and transmission connector.
2 CHECK ATF TEMPERATURE SENSOR. Turn the ignition switch to OFF. Connect the connectors to transmission and TCM. Start the engine. Warm up the transmission until the ATF temperature exceeds 80°C (176°F). Disconnect the connector from transmission. Measure the resistance between transmission connector terminals. Connector & terminal (T4) No. 5 - (T4) No. 12	Is the resistance 300 - 800 ohms?	Go to step 3 .	Go to step 5 .
3 CHECK ATF TEMPERATURE SENSOR. Measure the resistance between transmission connector terminals. Connector & terminal (T4) No. 5 - (T4) No. 12	Does the resistance value increase while the ATF temperature decreases?	Go to step 4 .	Go to step 5 .
4 CHECK INPUT SIGNAL FOR TCM. Connect the connector. Turn the ignition switch to ON. Read the data of «ATF Temp.» using the Subaru Select Monitor.	Does the ATF temperature gradually decrease?	Check for poor contact of the harness between the ATF temperature sensor and transmission connector, and repair the defective part.	Go to step 6 .
5 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 chassis ground and control valve body connector. Connector & terminal (T10) No. 3 - Chassis ground: (T10) No. 4 - Chassis ground	Is the resistance 1 Mohms or more?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Repair the short circuit of harness between transmission connector and control valve body connector.
6 CHECK FOR POOR CONTACT.	Is there poor contact of ATF temperature sensor circuit?	Repair the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Scheme 819

Scheme 819: WIRING DIAGRAM

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 ohms?	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 Mohms 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 ohms?	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 Mohms 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 .

NOTE
Turbine speed sensor 1 signal can be measured only on 4th speed.

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 .

DIAGNOSTIC PROCEDURE

Stop light system. Refer to appropriate SYSTEM WIRING DIAGRAM article.

Scheme 820

Scheme 820: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK DTC.	Is any of following DTC displayed?/AT CAN Communication Circuit/Output Speed Sensor Circuit/AT Vehicle Speed Sensor Circuit Malfunction (Rear Wheel)/VDC Brake SW Circuit	Perform the diagnosis according to DTC.	Go to step 2 .
2 CHECK BODY INTEGRATED UNIT. Turn the ignition switch to OFF. Connect the Subaru Select Monitor to data link connector. Turn the ignition switch to ON. Run the Subaru Select Monitor. Depress the brake pedal. Read the data of «Stop Light Switch» using Subaru Select Monitor. Refer to READ CURRENT DATA .	Is "ON" displayed?	Go to step 3 .	Go to step 4 .
3 CHECK TCM. Read the data of «Stop Light Switch» using Subaru Select Monitor. Refer to READ CURRENT DATA .	Is "ON" displayed?	A temporary poor contact of connector or harness may be the cause. Check the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
4 CHECK BODY INTEGRATED UNIT INPUT SIGNAL. Disconnect the connector from body integrated unit. Depress the brake pedal. Measure the voltage between body integrated unit connector and chassis ground. Connector & terminal (B280) No. 10 (+) - Chassis ground (-)	Is the voltage 10 V or more?	Go to step 7 .	Go to step 5 .
5 CHECK HARNESS CONNECTOR BETWEEN BODY INTEGRATED UNIT AND STOP LIGHT SWITCH. Turn the ignition switch to OFF. Disconnect the connector from stop light switch. Measure the resistance of harness between body integrated unit connector and stop light switch connector. Connector & terminal (B280) No. 10 - (B65) No. 3	Is the resistance less than 1 ohms?	Go to step 6 .	Repair the open circuit of the harness between the body integrated unit and stop light switch connector.
6 CHECK HARNESS CONNECTOR BETWEEN BODY INTEGRATED UNIT AND STOP LIGHT SWITCH. Measure the resistance of harness between body integrated unit connector and stop light switch connector. Connector & terminal (B280) No. 10 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 7 .	Repair the short circuit of the harness between the body integrated unit and stop light switch connector.
7 CHECK FOR POOR CONTACT.	Is there poor contact of input signal of brake switch?	Repair the poor contact.	Check body integrated unit.

DIAGNOSTIC PROCEDURE

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

Scheme 821

Scheme 821: WIRING DIAGRAM

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. 24 - (B11) No. 1: (B55) No. 27 - (B11) No. 7	Is the resistance less than 1 ohms?	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. 24 - Chassis ground	Is the resistance 1 Mohms 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 (B11) No. 1 (+) - (B11) No. 2 (-)	Is the voltage 4 - 6 V?	Go to step 6 .	Replace the TCM. Refer 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. 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 increase as the «Front Wheel Speed» data increases?	Check the harness of the front vehicle speed sensor circuit, and repair the defective part.	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 ohms?	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 Mohms or more?	Go to step 9 .	Repair the short circuit of harness between control valve body connector and transmission ground.
9 CHECK HARNESS CONNECTOR BETWEEN CONTROL VALVE BODY AND FRONT VEHICLE SPEED SENSOR. Disconnect the connector from the front vehicle speed sensor. Measure the resistance of the harness between the control valve body connector and front vehicle speed sensor connector. Connector & terminal (T10) No. 2 - (T15) No. 2: (T14) No. 1 - (T15) No. 3: (T14) No. 4 - (T15) No. 1	Is the resistance less than 1 ohms?	Go to step 10 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
10 CHECK HARNESS CONNECTOR BETWEEN CONTROL VALVE BODY AND FRONT 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 Mohms or more?	Replace the front vehicle speed sensor. Refer to FRONT VEHICLE SPEED SENSOR .	Replace the control valve body. Refer to CONTROL VALVE BODY .

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 .

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

Stop light system. Refer to appropriate SYSTEM WIRING DIAGRAM article.

Step	Check	Yes	No
1 CHECK DTC.	Is any of following DTC detected?/AT CAN Communication Circuit/Output Speed Sensor Circuit/AT Vehicle Speed Sensor Circuit Malfunction (Rear Wheel)/VDC Brake SW Circuit	Perform the diagnosis according to DTC.	Go to step 2 .
2 CHECK BODY INTEGRATED UNIT. Turn the ignition switch to OFF. Connect the Subaru Select Monitor to data link connector. Turn the ignition switch to ON. Run the Subaru Select Monitor. Read the data of «Stop Light Switch» using Subaru Select Monitor. Refer to READ CURRENT DATA .	Is "OFF" displayed?	Go to step 3 .	Go to step 4 .
3 CHECK TCM. Read the data of «Stop Light Switch» using Subaru Select Monitor. Refer to READ CURRENT DATA .	Is "OFF" displayed?	A temporary poor contact of connector or harness may be the cause. Check the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
4 CHECK BODY INTEGRATED UNIT INPUT SIGNAL. Disconnect the connector from body integrated unit. Measure the voltage between body integrated unit connector and chassis ground. Connector & terminal (B280) No. 10 (+) - Chassis ground (-)	Is the voltage 10 V or more?	Go to step 5 .	Go to step 7 .
5 CHECK STOP LIGHT SWITCH. Turn the ignition switch to OFF. Disconnect the connector from stop light switch. Measure the resistance of harness between stop light switch connectors. Connector & terminal (B65) No. 3 - (B65) No. 2	Is the resistance 1 Mohms or more?	Go to step 6 .	Replace the stop light switch. Refer to STOP LIGHT SWITCH .
6 CHECK HARNESS CONNECTOR BETWEEN BODY INTEGRATED UNIT AND STOP LIGHT SWITCH. Turn the ignition switch to ON. Measure the voltage of harness between body integrated unit connector and chassis ground. Connector & terminal (B280) No. 10 (+) - Chassis ground (-)	Is the voltage less than 1 V?	Go to step 7 .	Repair the short circuit of the harness between the body integrated unit and stop light switch connector.
7 CHECK FOR POOR CONTACT.	Is there poor contact of input signal of brake switch?	Repair the poor contact.	Check body integrated unit.

DIAGNOSTIC PROCEDURE

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

Scheme 822

Scheme 822: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B54) No. 22 - Chassis ground: (B54) No. 23 - Chassis ground: (B55) No. 7 - (B11) No. 20	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B55) No. 7 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 3 .	Repair the short circuit of harness between TCM and transmission connector.
3 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. NOTE: 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. 20 - (T11) No. 5	Is the resistance less than 1 ohms?	Go to step 4 .	Repair the open circuit of harness between transmission connector and control valve body connector.
4 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 5 - Transmission ground	Is the resistance 1 Mohms or more?	Go to step 5 .	Repair the short circuit of harness between control valve body connector and transmission ground.
5 CHECK LOCK-UP SOLENOID. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 5 - Transmission ground	Is the resistance 3 - 9 ohms?	Go to step 6 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
6 CHECK FOR POOR CONTACT. Check the TCM connector, transmission connector and control valve body connector.	Is there poor contact, loosing terminal, entering foreign matter, or damaging connector body?	Repair the poor contact.	Go to step 7 .
7 CHECK AFTER REPAIR. Perform the Clear Memory Mode. Drive for a while and read DTC.	Is DTC displayed?	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .	Temporary poor contact or open circuit occurs. Recheck that the harness connector has no faulty.

NOTE
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Scheme 823

Scheme 823: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B54) No. 22 - Chassis ground: (B54) No. 23 - Chassis ground: (B55) No. 6 - (B11) No. 19	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B55) No. 6 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 3 .	Repair the short circuit of harness between TCM and transmission connector.
3 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. 19 - (T11) No. 1	Is the resistance less than 1 ohms?	Go to step 4 .	Repair the open circuit of harness between transmission connector and control valve body connector.
4 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 1 - Transmission ground	Is the resistance 1 Mohms or more?	Repair the open circuit of harness between control valve body connector and transmission ground.	Go to step 5 .
5 CHECK LINE PRESSURE SOLENOID. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 1 - Transmission ground	Is the resistance 3 - 9 ohms?	Go to step 6 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
6 CHECK FOR POOR CONTACT. Check the TCM connector, transmission connector and control valve body connector.	Is there poor contact, loosing terminal, entering foreign matter, or damaging connector body?	Repair the poor contact.	Go to step 7 .
7 CHECK AFTER REPAIR. Perform the Clear Memory Mode. Drive for a while and read DTC.	Is DTC displayed?	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .	Temporary poor contact or open circuit occurs. Recheck that the harness connector has no faulty.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Scheme 824

Scheme 824: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B54) No. 22 - Chassis ground: (B54) No. 23 - Chassis ground: (B55) No. 4 - (B11) No. 17: (B55) No. 15 - (B11) No. 3	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B55) No. 4 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 3 .	Repair the short circuit of harness between TCM and transmission connector.
3 CHECK INPUT SIGNAL FOR TCM. Connect all connectors. Turn the ignition switch to ON. Read the data of «F/B Fluid Pressure» using Subaru Select Monitor.	Is "OFF" displayed?	Go to step 4 .	Go to step 6 .
4 CHECK INPUT SIGNAL FOR TCM. Turn the ignition switch to OFF. Start the engine. Shift to 1st speed while checking the current gear position using Subaru Select Monitor. Read the data of «F/B Fluid Pressure» using Subaru Select Monitor.	Is "ON" displayed?	Check for poor contact of harness in the solenoid output and oil pressure SW input, and repair the defective part.	Go to step 5 .
5 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 (B11) No. 3 - (T10) No. 7: (B11) No. 17 - (T11) No. 8	Is the resistance less than 1 ohms?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Replace the transmission harness assembly.
6 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 ground and control valve body connector. Connector & terminal (T10) No. 7 - Transmission ground	Is the resistance 1 Mohms or more?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Replace the transmission harness assembly.

CAUTION
Do not drain ATF until it cools down.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Scheme 825

Scheme 825: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B54) No. 22 - Chassis ground: (B54) No. 23 - Chassis ground: (B55) No. 4 - (B11) No. 17	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B55) No. 4 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 3 .	Repair the short circuit of harness between TCM and transmission connector.
3 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. 17 - (T11) No. 8	Is the resistance less than 1 ohms?	Go to step 4 .	Repair the open circuit of harness between transmission connector and control valve body connector.
4 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 8 - Transmission ground	Is the resistance 1 Mohms or more?	Repair the open circuit of harness between control valve body connector and transmission ground.	Go to step 5 .
5 CHECK FRONT BRAKE SOLENOID. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 8 - Transmission ground	Is the resistance 3 - 9 ohms?	Go to step 6 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
6 CHECK FOR POOR CONTACT. Check the TCM connector, transmission connector and control valve body connector.	Is there poor contact, loosing terminal, entering foreign matter, or damaging connector body?	Repair the poor contact.	Go to step 7 .
7 CHECK AFTER REPAIR. Perform the Clear Memory Mode. Drive for a while and read DTC.	Is DTC displayed?	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .	Temporary poor contact or open circuit occurs. Recheck that the harness connector has no faulty.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Scheme 826

Scheme 826: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B54) No. 22 - Chassis ground: (B54) No. 23 - Chassis ground: (B55) No. 3 - (B11) No. 18: (B55) No. 20 - (B11) No. 11	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B55) No. 20 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 3 .	Repair the short circuit of harness between TCM and transmission connector.
3 CHECK INPUT SIGNAL FOR TCM. Connect all connectors. Turn the ignition switch to ON. Read the data of «I/C Fluid Pressure» using Subaru Select Monitor.	Is "OFF" displayed?	Go to step 4 .	Go to step 6 .
4 CHECK INPUT SIGNAL FOR TCM. Turn the ignition switch to OFF. Start the engine. Drive the vehicle on 4th speed of manual mode with checking current gear position using Subaru Select Monitor. Read the data of «I/C Fluid Pressure» using Subaru Select Monitor.	Is "ON" displayed?	Check for poor contact of harness in the solenoid output and oil pressure SW input, and repair the defective part.	Go to step 5 .
5 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. 11 - (T10) No. 8: (T4) No. 18 - (T11) No. 3	Is the resistance less than 1 ohms?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Replace the transmission harness assembly.
6 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 ground and control valve body connector. Connector & terminal (T10) No. 8 - Transmission ground	Is the resistance 1 Mohms or more?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Replace the transmission harness assembly.

CAUTION
Do not drain ATF until it cools down.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Scheme 827

Scheme 827: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B54) No. 22 - Chassis ground: (B54) No. 23 - Chassis ground: (B55) No. 3 - (B11) No. 18	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance of harness between TCM connector and body harness. Connector & terminal (B55) No. 3 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 3 .	Repair the short circuit of harness between TCM and transmission connector.
3 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. 18 - (T11) No. 3	Is the resistance less than 1 ohms?	Go to step 4 .	Repair the open circuit of harness between transmission connector and control valve body connector.
4 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 3 - Transmission ground	Is the resistance 1 Mohms or more?	Repair the open circuit of harness between control valve body connector and transmission ground.	Go to step 5 .
5 CHECK INPUT CLUTCH SOLENOID. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 3 - Transmission ground	Is the resistance 3 - 9 ohms?	Go to step 6 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
6 CHECK FOR POOR CONTACT. Check the TCM connector, transmission connector and control valve body connector.	Is there poor contact, loosing terminal, entering foreign matter, or damaging connector body?	Repair the poor contact.	Go to step 7 .
7 CHECK AFTER REPAIR. Perform the Clear Memory Mode. Drive for a while and read DTC.	Is DTC displayed?	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .	Temporary poor contact or open circuit occurs. Recheck that the harness connector has no faulty.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Scheme 828

Scheme 828: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B54) No. 22 - Chassis ground: (B54) No. 23 - Chassis ground: (B55) No. 5 - (B11) No. 15: (B55) No. 14 - (B11) No. 4	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B55) No. 14 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 3 .	Repair the short circuit of harness between TCM and transmission connector.
3 CHECK INPUT SIGNAL FOR TCM. Connect all connectors. Turn the ignition switch to ON. Read the data of «H&LR/C Oil Pressure Switch» using Subaru Select Monitor.	Is "OFF" displayed?	Go to step 4 .	Go to step 6 .
4 CHECK INPUT SIGNAL FOR TCM. Turn the ignition switch to OFF. Start the engine. Set the select lever to "N" range while depressing the brake pedal. Read the data of «H&LR/C Oil Pressure Switch» using Subaru Select Monitor.	Does the display show "OFF"?	Check for poor contact of harness in the solenoid output and oil pressure SW input, and repair the defective part.	Go to step 5 .
5 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. 4 - (T10) No. 6: (T4) No. 15 - (T11) No. 2	Is the resistance less than 1 ohms?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Replace the transmission harness assembly.
6 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 ground and control valve body connector. Connector & terminal (T10) No. 6 - Transmission ground	Is the resistance 1 Mohms or more?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Replace the transmission harness assembly.

CAUTION
Do not drain ATF until it cools down.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Scheme 829

Scheme 829: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B54) No. 22 - Chassis ground: (B54) No. 23 - Chassis ground: (B55) No. 5 - (B11) No. 15	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B55) No. 5 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 3 .	Repair the short circuit of harness between TCM and transmission connector.
3 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. 15 - (T11) No. 2	Is the resistance less than 1 ohms?	Go to step 4 .	Repair the open circuit of harness between transmission connector and control valve body connector.
4 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 2 - Transmission ground	Is the resistance 1 Mohms or more?	Repair the open circuit of harness between control valve body connector and transmission ground.	Go to step 5 .
5 CHECK HIGH & LOW REVERSE CLUTCH SOLENOID. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 2 - Transmission ground	Is the resistance 3 - 9 ohms?	Go to step 6 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
6 CHECK FOR POOR CONTACT. Check the TCM connector, transmission connector and control valve body connector.	Is there poor contact, loosing terminal, entering foreign matter, or damaging connector body?	Repair the poor contact.	Go to step 7 .
7 CHECK AFTER REPAIR. Perform the Clear Memory Mode. Drive for a while and read DTC.	Is DTC displayed?	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .	Temporary poor contact or open circuit occurs. Recheck that the harness connector has no faulty.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Scheme 830

Scheme 830: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B54) No. 22 - Chassis ground: (B54) No. 23 - Chassis ground: (B55) No. 1 - (B11) No. 16: (B55) No. 22 - (B11) No. 10	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND BODY HARNESS. Measure the resistance of harness between TCM connector and body harness. Connector & terminal (B55) No. 22 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 3 .	Repair the short circuit of harness between TCM and transmission connector.
3 CHECK INPUT SIGNAL FOR TCM. Connect all connectors. Turn the ignition switch to ON. Read the data of «D/C Fluid Pressure» using Subaru Select Monitor.	Is "OFF" displayed?	Go to step 4 .	Go to step 6 .
4 CHECK INPUT SIGNAL FOR TCM. Turn the ignition switch to OFF. Start the engine. Shift to 2nd speed of manual mode and depress the brake with checking current gear position using Subaru Select Monitor. Read the data of «D/C Fluid Pressure» using Subaru Select Monitor.	Is "ON" displayed?	Check for poor contact of harness in the solenoid output and oil pressure SW input, and repair the defective part.	Go to step 5 .
5 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. 10 - (T10) No. 9: (T4) No. 16 - (T11) No. 4	Is the resistance less than 1 ohms?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Replace the transmission harness assembly.
6 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 ground and control valve body connector. Connector & terminal (T10) No. 9 - Transmission ground	Is the resistance 1 Mohms or more?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Replace the transmission harness assembly.

CAUTION
Do not drain ATF until it cools down.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Scheme 831

Scheme 831: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B54) No. 22 - Chassis ground: (B54) No. 23 - Chassis ground: (B55) No. 1 - (B11) No. 16	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B55) No. 1 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 3 .	Repair the short circuit of harness between TCM and transmission connector.
3 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. 16 - (T11) No. 4	Is the resistance less than 1 ohms?	Go to step 4 .	Repair the open circuit of harness between transmission connector and control valve body connector.
4 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 4 - Transmission ground	Is the resistance 1 Mohms or more?	Repair the open circuit of harness between control valve body connector and transmission ground.	Go to step 5 .
5 CHECK DIRECT CLUTCH SOLENOID. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 4 - Transmission ground	Is the resistance 3 - 9 ohms?	Go to step 6 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
6 CHECK FOR POOR CONTACT. Check the TCM connector, transmission connector and control valve body connector.	Is there poor contact, loosing terminal, entering foreign matter, or damaging connector body?	Repair the poor contact.	Go to step 7 .
7 CHECK AFTER REPAIR. Perform the Clear Memory Mode. Drive for a while and read DTC.	Is DTC displayed?	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .	Temporary poor contact or open circuit occurs. Recheck that the harness connector has no faulty.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Scheme 832

Scheme 832: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B54) No. 22 - Chassis ground: (B54) No. 23 - Chassis ground: (B55) No. 19 - (B11) No. 13: (B55) No. 21 - (B11) No. 9	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B55) No. 21 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 3 .	Repair the short circuit of harness between TCM and transmission connector.
3 CHECK INPUT SIGNAL FOR TCM. Connect all connectors. Turn the ignition switch to ON. Read the data of «Fwd/B hydraulic pressure SW» using Subaru Select Monitor.	Is "OFF" displayed?	Go to step 4 .	Go to step 6 .
4 CHECK INPUT SIGNAL FOR TCM. Turn the ignition switch to OFF. Start the engine. Drive the vehicle on 2nd speed of manual mode at 15 km/h (9 MPH) with checking current gear position using Subaru Select Monitor. Read the data of «Fwd/B hydraulic pressure SW» using Subaru Select Monitor.	Is "ON" displayed?	Check for poor contact of harness in the solenoid output and oil pressure SW input, and repair the defective part.	Go to step 5 .
5 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. 9 - (T10) No. 10: (T4) No. 13 - (T11) No. 7	Is the resistance less than 1 ohms?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Replace the transmission harness assembly.
6 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 ground and control valve body connector. Connector & terminal (T10) No. 10 - Transmission ground	Is the resistance 1 Mohms or more?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Replace the transmission harness assembly.

CAUTION
Do not drain ATF until it cools down.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Scheme 833

Scheme 833: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B54) No. 22 - Chassis ground: (B54) No. 23 - Chassis ground: (B55) No. 19 - (B11) No. 13	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND BODY HARNESS. Measure the resistance of harness between TCM connector and body harness. Connector & terminal (B55) No. 19 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 3 .	Repair the short circuit of harness between TCM and transmission connector.
3 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. 13 - (T11) No. 7	Is the resistance less than 1 ohms?	Go to step 4 .	Repair the open circuit of harness between transmission connector and control valve body connector.
4 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 7 - Transmission ground	Is the resistance 1 Mohms or more?	Repair the open circuit of harness between control valve body connector and transmission ground.	Go to step 5 .
5 CHECK FORWARD BRAKE SOLENOID. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 7 - Transmission ground	Is the resistance 5 - 17 ohms?	Go to step 6 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
6 CHECK FOR POOR CONTACT. Check the TCM connector, transmission connector and control valve body connector.	Is there poor contact, loosing terminal, entering foreign matter, or damaging connector body?	Repair the poor contact.	Go to step 7 .
7 CHECK AFTER REPAIR. Perform the Clear Memory Mode. Drive for a while and read DTC.	Is DTC displayed?	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .	Temporary poor contact or open circuit occurs. Recheck that the harness connector has no faulty.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

Shift lock control system. Refer to appropriate SYSTEM WIRING DIAGRAM article.

Scheme 834

Scheme 834: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK SHIFT LOCK SOLENOID. Forcibly activate the body integrated unit to check the operation of shift lock solenoid. Refer to FUNCTION CHECK . Move the shift lever without depressing the brake pedal.	Does the shift lever move?	Go to step 2 .	Go to step 3 .
2 CHECK OUTPUT SIGNAL OF BODY INTEGRATED UNIT. Display the following items using Subaru Select Monitor. Refer to READ CURRENT DATA . Key-lock warning SW Shift position PSW Stop light switch With the brake pedal depressed, shift the select lever to "P" range.	Do the units of measure of items displayed change?	Go to step 3 .	Check the circuits of the items whose values do not change.
3 CHECK HARNESS CONNECTOR BETWEEN BODY INTEGRATED UNIT AND SHIFT LOCK SOLENOID. Measure the harness resistance between the body integrated unit and chassis ground. Connector & terminal (B281) No. 5 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 4 .	Repair the short circuit of harness between body integrated unit and shift lock solenoid connector.
4 CHECK HARNESS BETWEEN SHIFT LOCK SOLENOID AND CHASSIS GROUND TERMINAL. Measure the resistance of harness between shift lock solenoid connector and chassis ground. Connector & terminal (B116) No. 4 - Chassis ground	Is the resistance less than 1 ohms?	Go to step 5 .	Repair the open circuit of the harness between the shift lock solenoid connector and chassis ground terminal.
5 CHECK SHIFT LOCK SOLENOID. Measure the resistance between the shift lock solenoid connector terminals. Connector & terminal (B116) No. 3 - No. 4	Is the resistance 12 - 18 ohms?	Go to step 6 .	Replace the shift lock solenoid. Refer to AT SHIFT LOCK SOLENOID AND "P" RANGE SWITCH .
6 CHECK OUTPUT SIGNAL OF BODY INTEGRATED UNIT. Connect all connectors. Turn the ignition switch to ON. Set the select lever to "D" range. Measure the voltage between body integrated unit and chassis ground. Connector & terminal (B281) No. 5 (+) - Chassis ground (-)	Is the voltage 10.5 V or more?	Go to step 7 .	Go to step 8 .
7 CHECK OUTPUT SIGNAL OF BODY INTEGRATED UNIT. Lift up the vehicle. Start the engine. Shift the select lever to "D" range and slowly increase vehicle speed to over 20 km/h (12 MPH). 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 . Measure the voltage between body integrated unit and chassis ground. Connector & terminal (B281) No. 5 (+) - Chassis ground (-)	Is the voltage less than 1 V?	Check the harnesses or connectors in reverse inhibitor control circuit, and repair the defective part.	Go to step 8 .
8 CHECK FOR POOR CONTACT.	Is there poor contact of the reverse inhibitor control circuit?	Repair the poor contact.	Replace the body integrated unit. Refer to BODY INTEGRATED UNIT .

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 .

DIAGNOSTIC PROCEDURE

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

Scheme 835

Scheme 835: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK DTC OF TCM.	Is DTC of Transmission Range Sensor Circuit (PRNDL Input) detected?	Perform the diagnosis according to DTC.	Go to step 2 .
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND BACK-UP LIGHT RELAY. Turn the ignition switch to OFF. Disconnect the connector from TCM and back-up light relay. Measure the resistance of harness between TCM connector and back-up light relay connector. Connector & terminal Without push button start (B54) No. 13 - (B499) No. 1: With push button start (B54) No. 13 - (B225) No. 8	Is the resistance less than 1 ohms?	Go to step 3 .	Repair the open circuit of the harness or poor contact of the connector between TCM and back-up light relay connector.
3 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B54) No. 13 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 4 .	Repair the short circuit of the harness between TCM and back-up light relay connector.
4 CHECK OUTPUT SIGNAL OF TCM. Turn the ignition switch to ON. Shift the select lever to "P" range. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B54) No. 13 (+) - Chassis ground (-)	Is the voltage 8 V or more?	Go to step 5 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
5 CHECK OUTPUT SIGNAL OF TCM. Set the select lever to "R" range. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B54) No. 13 (+) - Chassis ground (-)	Is the voltage 1 V or less?	Go to step 6 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
6 CHECK INPUT VOLTAGE FOR BACK-UP LIGHT RELAY. Measure the voltage between back-up light relay and chassis ground.	Is the voltage 10 - 13 V?	Replace the backup light relay.	Check open or short circuit of harness between fuse (No. 18) and backup light relay.

DIAGNOSTIC PROCEDURE

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

Step	Check	Yes	No
1 CHECK DTC OF TCM.	Is DTC of Transmission Range Sensor Circuit (PRNDL Input) detected?	Perform the diagnosis according to DTC.	Go to step 2 .
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND BACK-UP LIGHT RELAY. Turn the ignition switch to OFF. Disconnect the connector from TCM and back-up light relay. Measure the resistance of harness between TCM connector and back-up light relay connector. Connector & terminal Without push button start (B54) No. 13 - (B499) No. 1: With push button start (B54) No. 13 - (B225) No. 8	Is the resistance less than 1 ohms?	Go to step 3 .	Repair the open circuit of the harness or poor contact of the connector between TCM and back-up light relay connector.
3 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B54) No. 13 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 4 .	Repair the short circuit of the harness between TCM and back-up light relay connector.
4 CHECK OUTPUT SIGNAL OF TCM. Turn the ignition switch to ON. Shift the select lever to "P" range. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B54) No. 13 (+) - Chassis ground (-)	Is the voltage 8 V or more?	Go to step 5 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
5 CHECK OUTPUT SIGNAL OF TCM. Set the select lever to "R" range. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B54) No. 13 (+) - Chassis ground (-)	Is the voltage 1 V or less?	Go to step 6 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
6 CHECK INPUT VOLTAGE FOR BACK-UP LIGHT RELAY. Measure the voltage between back-up light relay and chassis ground.	Is the voltage 10 - 13 V?	Replace the backup light relay.	Check open or short circuit of harness between fuse (No. 18) and backup light relay.

DIAGNOSTIC PROCEDURE

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

Scheme 836

Scheme 836: WIRING DIAGRAM

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 ohms?	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 Mohms 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.

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 .

DIAGNOSTIC PROCEDURE

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

Scheme 837

Scheme 837: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM connector and transmission connector. Connector & terminal (B54) No. 22 - Chassis ground: (B54) No. 23 - Chassis ground: (B55) No. 2 - (B11) No. 8	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B54) No. 23 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 3 .	Repair the short circuit of harness between TCM and transmission connector.
3 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. 8 - (T11) No. 6	Is the resistance less than 1 ohms?	Go to step 4 .	Repair the open circuit of harness between transmission connector and control valve body connector.
4 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 6 - Transmission ground	Is the resistance 1 Mohms or more?	Repair the open circuit of harness between control valve body connector and transmission ground.	Go to step 5 .
5 CHECK TRANSFER SOLENOID. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T11) No. 6 - Transmission ground	Is the resistance 3 - 9 ohms?	Go to step 6 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
6 CHECK FOR POOR CONTACT. Check the TCM connector, transmission connector and control valve body connector.	Is there poor contact, loosing terminal, entering foreign matter, or damaging connector body?	Repair the poor contact.	Go to step 7 .
7 CHECK AFTER REPAIR. Perform the Clear Memory Mode. Drive for a while and read DTC.	Is DTC displayed?	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .	Temporary poor contact or open circuit occurs. Recheck that the harness connector has no faulty.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Scheme 838

Scheme 838: WIRING DIAGRAM

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. 25 - (B12) No. 6: (B55) No. 27 - (B11) No. 7	Is the resistance less than 1 ohms?	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. 25 - Chassis ground	Is the resistance 1 Mohms 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 2. Measure the voltage between TCM connector terminals. Connector & terminal (B12) No. 6 (+) - (B11) No. 2 (-)	Is the voltage 4 - 6 V?	Go to step 6 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
6 CHECK INPUT SIGNAL FOR TCM. Connect all connectors. Lift up the vehicle. Start the engine. Drive at 1st of manual mode. Read the data of «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 .	Does the speedometer indication in the combination meter change according to «AT Turbine Speed 2» data?	Check for poor contact of the turbine speed sensor 2 and transmission connector harness, and repair the defective part.	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 (T3) No. 6 - (T10) No. 1	Is the resistance less than 1 ohms?	Go to step 8 .	Repair the open circuit of harness between transmission connector and control valve body 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. 1 - Transmission ground	Is the resistance 1 Mohms or more?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Repair the short circuit of harness between control valve body connector and transmission ground.

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 .

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

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

Scheme 839

Scheme 839: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK GROUND CIRCUIT OF MANUAL MODE SWITCH. Turn the ignition switch to OFF. Disconnect the connector from manual mode switch. Measure the resistance of the harness between the manual mode switch connector and chassis ground. Connector & terminal (B116) No. 8 - Chassis ground	Is the resistance less than 1 ohms?	Go to step 2 .	Repair the open circuit of the harness between the manual mode switch and chassis ground.
2 CHECK MANUAL MODE SWITCH. Measure the resistance between manual mode switch terminals. Connector & terminal (B116) No. 7 - No. 8	Is the resistance 1 Mohms or more?	Go to step 3 .	Replace the select lever assembly. Refer to SELECT LEVER .
3 CHECK MANUAL MODE SWITCH. Shift the select lever to manual mode. Measure the resistance between manual mode switch terminals. Connector & terminal (B116) No. 7 - No. 8	Is the resistance less than 1 ohms?	Go to step 4 .	Replace the select lever assembly. Refer to SELECT LEVER .
4 CHECK HARNESS CONNECTOR BETWEEN TCM AND MANUAL MODE SWITCH. Disconnect the connector from TCM. Measure the resistance of harness between TCM connector and manual mode switch connector. Connector & terminal (B116) No. 7 - (B54) No. 6	Is the resistance less than 1 ohms?	Go to step 5 .	Repair the open circuit of the harness or poor contact of the connector between TCM and manual mode switch connector.
5 CHECK HARNESS CONNECTOR BETWEEN TCM AND MANUAL MODE SWITCH. Disconnect the connector from TCM. Measure the resistance of the harness between the manual mode switch connector and chassis ground. Connector & terminal (B116) No. 7 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 6 .	Repair the short circuit of the harness between TCM and manual mode switch connector.
6 CHECK INPUT SIGNAL FOR TCM. Connect the connector to TCM and manual mode switch. Turn the ignition switch to ON. Shift the select lever to normal mode. Measure the voltage of signal to TCM. Connector & terminal (B54) No. 6 (+) - Chassis ground (-)	Is the voltage 10 V or more?	Go to step 7 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
7 CHECK FOR POOR CONTACT.	Is there poor contact of the manual mode switch circuit?	Repair the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .

DIAGNOSTIC PROCEDURE

Automatic Transaxle (5AT) (Diagnostics): Wiring Subaru Outback BS

WIRING DIAGRAM

Scheme 815

Scheme 816

Scheme 817

Scheme 818

Scheme 819

Scheme 820

Scheme 821

Scheme 822

Scheme 823

Scheme 824

Scheme 825

Scheme 826

Scheme 827

Scheme 828

Scheme 829

Scheme 830

Scheme 831

Scheme 832

Scheme 833

Scheme 834

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Scheme 838

Scheme 839

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