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 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 connector 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 as 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 temperature using 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 fault location. | 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. Ref. 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. Ref. to TRANSMISSION CONTROL MODULE (TCM) . |
| CAUTION |
|---|
| Do not drain ATF until it cools down. |
DIAGNOSIS PROCEDURE
| 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. Ref. 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. Ref. 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. Ref. 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. |
| 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 harness between TCM connector 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. |
DIAGNOSIS PROCEDURE
| 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 (B54) No. 13 - (B499) No. 1 | Is the resistance less than 1 ohms? | Go to step 3 . | Repair the open circuit of harness or poor contact of connector between TCM connector and back-up light relay connector. |
| 3 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. 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 harness between TCM connector and transmission 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. Ref. 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. Ref. 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. |
DIAGNOSIS PROCEDURE