Automatic Transmission 4AT (Diagnostics): Diagnosis — Automatic Transmission 4AT (Diagnostics) — Automatic Trans

DIAGNOSIS

ATF temperature warning light circuit is open or shorted.

TROUBLE SYMPTOM

When the ignition switch is turned to ON, the ATF temperature warning light does not illuminate.

Scheme 58

Scheme 58: WIRING DIAGRAM

Step	Check	Yes	No
1 ATF TEMPERATURE WARNING LIGHT INSPECTION . Turn the ignition switch to ON.	Does the ATF temperature warning light illuminate?	Go to step 2 .	Perform self diagnosis of the combination meter. Refer to INSPECTION , Combination Meter System.
2 ATF TEMPERATURE WARNING LIGHT INSPECTION . After the ignition switch is ON, wait for at least 2 seconds.	Does the ATF temperature warning light illuminate?	Go to step 3 .	Go to step 4 .
3 ATF TEMPERATURE WARNING LIGHT INSPECTION . Start the engine.	Does the ATF temperature warning light turn off?	Normal. Go back to the "Basic Diagnostic Procedure". Refer to BASIC DIAGNOSTIC PROCEDURE .	Go to step 7 .
4 CHECK SUBARU SELECT MONITOR COMMUNICATION . Connect the Subaru Select Monitor to the data link connector.	Is the communication between Subaru Select Monitor and TCM normal?	Go to step 5 .	Check the power supply ground circuit of the TCM and the Subaru Select Monitor communication. Refer to DIAGNOSTIC PROCEDURE FOR SUBARU SELECT MONITOR COMMUNICATION .
5 CHECK TCM . Connect the Subaru Select Monitor, and display the current data of the TCM. Refer to OPERATION , Subaru Select Monitor. Read the data of the "Diagnosis Lamp".	Is "ON" displayed?	Go to step 6 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
6 CHECK BODY INTEGRATED UNIT . Connect the Subaru Select Monitor, and display the current data of the body integrated unit. Refer to OPERATION , Subaru Select Monitor. Read the data of the "ATF Temperature Lamp".	Does the display show "ON"?	Replace the combination meter assembly. Refer to COMBINATION METER .	Check the DTC of the body integrated unit. Refer to OPERATION , Subaru Select Monitor.
7 CHECK TCM . Display the current data of TCM using Subaru Select Monitor. Read the data of the "Diagnosis Lamp".	Is "ON" displayed?	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .	Go to step 8 .
8 CHECK BODY INTEGRATED UNIT . Connect the Subaru Select Monitor, and display the current data of the body integrated unit. Read the data of the "ATF Temperature Lamp".	Does the display show "ON"?	Check DTC of body integrated unit. Perform diagnosis according to the DTC. Refer to OPERATION , Subaru Select Monitor.	Perform self diagnosis of the combination meter. Refer to INSPECTION , Combination Meter System.

DIAGNOSTIC PROCEDURE

Defective harness connector

Subaru Select Monitor communication failure

Scheme 59

Scheme 59: 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 . Disconnect the connectors from the ECM. Measure the resistance of harness between data link connector and ECM. Connector & terminal (B40) No. 4 - (B136) No. 6: (B40) No. 5 - (B136) No. 6	Is the resistance less than 1 ohms?	Go to step 4 .	Repair the open circuit of harness between data link connector and ECM.
4 CHECK SUBARU SELECT MONITOR GROUND CIRCUIT . Measure the resistance of harness between data link connector and chassis ground. Connector & terminal (B40) No. 16 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 5 .	Repair the short circuit of harness between data link connector and ground terminals.
5 CHECK ENGINE GROUND CIRCUIT . Check the engine ground circuit.	Is the engine ground circuit normal?	Go to step 6 .	Repair ground circuit of ECM.
6 CHECK COMMUNICATION OF SUBARU SELECT MONITOR . Turn the ignition switch to ON. Check the communication with the transmission.	Is the name of system displayed on Subaru Select Monitor?	Go to step 11 .	Go to step 7 .
7 CHECK COMMUNICATION OF SUBARU SELECT MONITOR . Turn the ignition switch to OFF. Disconnect the TCM connector. Turn the ignition switch to ON. Check the communication with the engine system.	Is the name of system displayed on Subaru Select Monitor?	Go to step 9 .	Go to step 8 .
8 CHECK OUTPUT SIGNAL OF TCM . Turn the ignition switch to OFF. Connect the connector to the TCM. From the data link connector (B40) No. 7, disconnect the connectors of control modules other than the TCM and ECM. CAUTION: When disconnecting the connector from the airbag control module, always follow the precautions of the AB article. Refer to CAUTION , General Description. Turn the ignition switch to ON. Check the communication with the transmission system.	Is the name of system displayed on Subaru Select Monitor?	Check each control module.	Go to step 9 .
9 CHECK HARNESS CONNECTOR BETWEEN EACH CONTROL MODULE AND DATA LINK CONNECTOR . Turn the ignition switch to OFF. From the data link connector (B40) No. 7, disconnect the connectors of all control modules. 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 10 .	Check harness and connector between each control module and data link connector.
10 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 11 .
11 CHECK HARNESS CONNECTOR BETWEEN TCM AND DATA LINK CONNECTOR . Measure the resistance between TCM connector and data link connector. Connector & terminal (B40) No. 7 - (B54) No. 8	Is the resistance less than 1 ohms?	Go to step 12 .	Repair the harness and connector between TCM and data link connector.
12 CHECK INSTALLATION OF TRANSMISSION HARNESS CONNECTOR .	Is the transmission harness connector connected to bulkhead harness connector?	Go to step 13 .	Connect the bulkhead harness connector to transmission harness connector.
13 CHECK POOR CONTACT OF CONNECTORS .	Is there poor contact in control module power supply and data link connector?	Repair the poor contact.	Go to step 14 .
14 CHECK TCM POWER SUPPLY . Disconnect the connector from TCM. Turn the ignition switch to ON. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B54) No. 25 (+) - Chassis ground (-): (B54) No. 26 (+) - Chassis ground (-): (B54) No. 27 (+) - Chassis ground (-)	Is the voltage 10-13 V?	Go to step 16 .	Go to step 15 .
15 CHECK M/B FUSE (NO. 12) . Turn the ignition switch to OFF. Remove the fuse (No. 12).	Is the fuse (No. 12) blown out?	Replace the fuse. If the replaced fuse blows out easily, repair the short circuit in the harness between the fuse and the TCM.	Repair the open circuit of harness between the fuse and the TCM, or the fuse and battery, and poor contacts of connectors.
16 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. 1 (+) - Chassis ground (-): (B54) No. 2 (+) - Chassis ground (-)	Is the voltage 10 - 13 V?	Go to step 18 .	Go to step 17 .
17 CHECK F/B FUSE (NO. 12) . Remove the fuse (No. 12).	Is the fuse (No. 12) blown out?	Replace the fuse. If the replaced fuse blows out easily, repair the short circuit in the harness between the fuse and the TCM.	Repair the open circuit of harness between the fuse and the TCM, or the fuse and battery, and poor contacts of connectors.
18 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 and transmission connector. Connector & terminal (B54) No. 20 - (B11) No. 20: (B54) No. 21 - (B11) No. 20: (B54) No. 22 - (B11) No. 19: (B54) No. 23 - (B11) No. 19	Is the resistance less than 1 ohms?	Go to step 19 .	Repair the open circuit of harness between TCM and transmission harness connector, and poor contact of connector.
19 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND TRANSMISSION GROUND . Measure the resistance of the harness between transmission and transmission ground. Connector & terminal (T4) No. 19 - Transmission ground: (T4) No. 20 - Transmission ground	Is the resistance less than 1 ohms?	Go to step 20 .	Repair the open circuit of the harness between transmission and transmission ground.
20 CHECK POOR CONTACT IN CONNECTORS .	Is there poor contact in TCM power supply, ground and data link connector?	Repair the connector.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .

CAUTION
When disconnecting the connector from the airbag control module, always follow the precautions of the AB article. Refer to CAUTION , General Description.

DIAGNOSTIC PROCEDURE

DTC DETECTING CONDITION

Inhibitor switch is faulty.
At least 2 range signal is input.

Shift characteristics are erroneous.
The range position of the select lever and the AT select lever position indicator light on the combination meter do not match.

Scheme 60

Scheme 60: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK INDICATOR LIGHT . Turn the ignition switch to ON. Move the select lever to "P" range.	Does the "P" range indicator light in the combination meter illuminate?	Go to step 2 .	Go to step 6 .
2 CHECK INDICATOR LIGHT . Set the select lever to "R" range.	Does the "P" range indicator light in the combination meter illuminate?	Go to step 20 .	Go to step 3 .
3 CHECK INDICATOR LIGHT . Move the select lever to "P" range.	Does the "R" range indicator light on combination meter illuminate?	Go to step 27 .	Go to step 4 .
4 CHECK INDICATOR LIGHT .	Does the "N" range indicator light on combination meter illuminate?	Go to step 34 .	Go to step 5 .
5 CHECK INDICATOR LIGHT .	Does the "D" range indicator light on combination meter illuminate?	Go to step 41 .	Go to step 7 .
6 CHECK "P" RANGE SWITCH . Read the data of "P range" using the Subaru Select Monitor.	Is ON displayed?	Go to step 17 .	Go to step 13 .
7 CHECK INDICATOR LIGHT . Set the select lever to "R" range.	Does the "R" range indicator light on combination meter illuminate?	Go to step 9 .	Go to step 8 .
8 CHECK "R" RANGE SWITCH . Read the data of "R range" using the Subaru Select Monitor.	Is ON displayed?	Go to step 24 .	Go to step 21 .
9 CHECK INDICATOR LIGHT . Set the select lever to "N" range.	Does the "N" range indicator light on combination meter illuminate?	Go to step 11 .	Go to step 10 .
10 CHECK "N" RANGE SWITCH . Read the data of "N range" using the Subaru Select Monitor.	Is ON displayed?	Go to step 31 .	Go to step 28 .
11 CHECK INDICATOR LIGHT . Set the select lever to the "D" range.	Does the "D" range indicator light on combination meter illuminate?	Check for poor contact in the TCM and transmission harness or connectors, and repair the fault location.	Go to step 12 .
12 CHECK "D" RANGE SWITCH . Read the data of "D range" using the Subaru Select Monitor.	Is ON displayed?	Go to step 38 .	Go to step 35 .
13 CHECK HARNESS CONNECTOR BETWEEN INHIBITOR SWITCH AND CHASSIS GROUND . Turn the ignition switch to OFF. Disconnect the connector from inhibitor switch. Measure the resistance of harness between inhibitor switch and chassis ground. Connector & terminal (T7) No. 1 - Chassis ground	Is the resistance less than 1 ohms?	Go to step 14 .	Repair the open circuit of harness between inhibitor switch and chassis ground, and poor contact of the connector.
14 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH . Turn the ignition switch to OFF. Disconnect the connector from TCM and inhibitor switch. Measure the resistance of the harness between TCM and inhibitor switch connector. Connector & terminal (B55) No. 14 - (T7) No. 2	Is the resistance less than 1 ohms?	Go to step 15 .	Repair the open circuit of harness between TCM and inhibitor switch connector, and poor contact of the connector.
15 CHECK INPUT SIGNAL FOR TCM . Turn the ignition switch to OFF. Connect the connector to TCM and inhibitor switch. Turn the ignition switch to ON. Move the select lever to "P" range. Measure the voltage between TCM and chassis ground. Connector & terminal (B55) No. 14 (+) - Chassis ground (-)	Is the voltage less than 1 V?	Go to step 16 .	Go to step 42 .
16 CHECK INPUT SIGNAL FOR TCM . Set the select lever to other than "P" range. Measure the voltage between TCM and chassis ground. Connector & terminal (B55) No. 14 (+) - Chassis ground (-)	Is the voltage 8 V or more?	Go to step 42 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
17 CHECK BODY INTEGRATED UNIT . Read the data of the "Inhibitor Switch" using the Subaru Select Monitor. Refer to OPERATION , Subaru Select Monitor.	Is "7" displayed?	Go to step 18 .	Check the body integrated unit.
18 CHECK BODY INTEGRATED UNIT . Check DTC of body integrated unit.	Is DTC of CAN communication displayed?	Perform diagnosis according to the DTC.	Go to step 19 .
19 CHECK COMBINATION METER . Check the "P" range indicator light. Refer to INSPECTION , Combination Meter System.	Is the "P" range indicator light bulb OK?	Go to step 42 .	Replace the combination meter assembly. Refer to COMBINATION METER .
20 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH . Turn the ignition switch to OFF. Disconnect the connectors from TCM, inhibitor switch and combination meter. Measure the resistance of the harness between TCM connector and chassis ground. Connector & terminal (B55) No. 14 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 42 .	Repair ground short circuit in "P" range circuit.
21 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH . Turn the ignition switch to OFF. Disconnect the connector from TCM and inhibitor switch. Measure the resistance of the harness between TCM and inhibitor switch connector. Connector & terminal (B55) No. 13 - (T7) No. 5	Is the resistance less than 1 ohms?	Go to step 22 .	Repair the open circuit of harness between TCM and inhibitor switch connector, and poor contact of the connector.
22 CHECK INPUT SIGNAL FOR TCM . Turn the ignition switch to OFF. Connect the connector to TCM and inhibitor switch. Turn the ignition switch to ON. Set the select lever to "R" range. Measure the voltage between TCM and chassis ground. Connector & terminal (B55) No. 13 (+) - Chassis ground (-)	Is the voltage less than 1 V?	Go to step 23 .	Go to step 42 .
23 CHECK INPUT SIGNAL FOR TCM . Set the select lever to a range other than "R". Measure the voltage between TCM and chassis ground. Connector & terminal (B55) No. 13 (+) - Chassis ground (-)	Is the voltage 8 V or more?	Go to step 42 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
24 CHECK BODY INTEGRATED UNIT . Using the Subaru Select Monitor, read the data of "Shift Position". Refer to OPERATION , Subaru Select Monitor.	Is "6" displayed?	Go to step 25 .	Check the body integrated unit.
25 CHECK BODY INTEGRATED UNIT . Check DTC of body integrated unit.	Is DTC of CAN communication displayed?	Perform diagnosis according to the DTC.	Go to step 26 .
26 CHECK COMBINATION METER . Check the "R" range indicator light. Refer to INSPECTION , Combination Meter System.	Is the "R" range indicator light OK?	Go to step 42 .	Replace the combination meter assembly. Refer to COMBINATION METER .
27 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH . Turn the ignition switch to OFF. Disconnect the connectors from TCM, inhibitor switch and combination meter. Measure the resistance of the harness between TCM connector and chassis ground. Connector & terminal (B55) No. 13 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 42 .	Repair ground short circuit in "R" range circuit.
28 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH . Turn the ignition switch to OFF. Disconnect the connector from TCM and inhibitor switch. Measure the resistance of the harness between TCM and inhibitor switch connector. Connector & terminal (B55) No. 11 - (T7) No. 3	Is the resistance less than 1 ohms?	Go to step 29 .	Repair the open circuit of harness between TCM and inhibitor switch connector, and poor contact of the connector.
29 CHECK INPUT SIGNAL FOR TCM . Turn the ignition switch to OFF. Connect the connector to TCM and inhibitor switch. Turn the ignition switch to ON. Set the select lever to "N" range. Measure the voltage between TCM and chassis ground. Connector & terminal (B55) No. 11 (+) - Chassis ground (-)	Is the voltage less than 1 V?	Go to step 30 .	Go to step 42 .
30 CHECK INPUT SIGNAL FOR TCM . Set the select lever to a range other than "N". Measure the voltage between TCM and chassis ground. Connector & terminal (B55) No. 11 (+) - Chassis ground (-)	Is the voltage 8 V or more?	Go to step 42 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
31 CHECK BODY INTEGRATED UNIT . Using the Subaru Select Monitor, read the data of "Shift Position". Refer to OPERATION , Subaru Select Monitor.	Is "5" displayed?	Go to step 32 .	Check the body integrated unit.
32 CHECK BODY INTEGRATED UNIT . Check DTC of body integrated unit.	Is DTC of CAN communication displayed?	Perform diagnosis according to the DTC.	Go to step 33 .
33 CHECK COMBINATION METER . Check the "N" range indicator light. Refer to INSPECTION , Combination Meter System.	Is the "N" range indicator light OK?	Go to step 42 .	Replace the combination meter assembly. Refer to COMBINATION METER .
34 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH . Turn the ignition switch to OFF. Disconnect the connectors from TCM, inhibitor switch and combination meter. Measure the resistance of the harness between TCM connector and chassis ground. Connector & terminal (B55) No. 11 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 42 .	Repair the ground short circuit in "N" range circuit.
35 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH . Turn the ignition switch to OFF. Disconnect the connector from TCM and inhibitor switch. Measure the resistance of the harness between TCM and inhibitor switch connector. Connector & terminal (B55) No. 10 - (T7) No. 4	Is the resistance less than 1 ohms?	Go to step 36 .	Repair the open circuit of harness between TCM and inhibitor switch connector, and poor contact of the connector.
36 CHECK INPUT SIGNAL FOR TCM . Turn the ignition switch to OFF. Connect the connector to TCM and inhibitor switch. Turn the ignition switch to ON. Set the select lever to the "D" range. Measure the voltage between TCM and chassis ground. Connector & terminal (B55) No. 10 (+) - Chassis ground (-)	Is the voltage less than 1 V?	Go to step 37 .	Go to step 42 .
37 CHECK INPUT SIGNAL FOR TCM . Set the select lever to a range other than "D". Measure the voltage between TCM and chassis ground. Connector & terminal (B55) No. 10 (+) - Chassis ground (-)	Is the voltage 8 V or more?	Go to step 42 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
38 CHECK BODY INTEGRATED UNIT . Read the data of the "Inhibitor Switch" using the Subaru Select Monitor. Refer to OPERATION , Subaru Select Monitor.	Is "4" displayed?	Go to step 39 .	Check the body integrated unit.
39 CHECK BODY INTEGRATED UNIT . Check DTC of body integrated unit.	Is DTC of CAN communication displayed?	Perform diagnosis according to the DTC.	Go to step 40 .
40 CHECK COMBINATION METER . Check the "D" range indicator light. Refer to INSPECTION , Combination Meter System.	Is the "D" range indicator light OK?	Go to step 42 .	Replace the combination meter assembly. Refer to COMBINATION METER .
41 CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH . Turn the ignition switch to OFF. Disconnect the connectors from TCM, inhibitor switch and combination meter. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B55) No. 10 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 42 .	Repair ground short circuit in "D" range circuit.
42 CHECK POOR CONTACT .	Is there poor contact in the inhibitor switch circuit?	Repair the poor contact.	Go to step 43 .
43 CHECK INHIBITOR SWITCH .	Is the inhibitor switch in a normal position?	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .	Adjust the inhibitor switch and select cable. Refer to ADJUSTMENT . Refer to ADJUSTMENT .

DIAGNOSTIC PROCEDURE

Input signal circuit to ATF temperature sensor is open or shorted.

Excessive shift shock

Scheme 61

Scheme 61: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND ATF TEMPERATURE SENSOR . Turn the ignition switch to OFF. Disconnect the connector from transmission and TCM. Measure the resistance of harness between TCM and transmission connector. Connector & terminal (B55) No. 23 - (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 ATF TEMPERATURE SENSOR . Measure the resistance of harness between TCM and transmission connector. Connector & terminal (B55) No. 12 - (B11) No. 15	Is the resistance less than 1 ohms?	Go to step 3 .	Repair the open circuit of harness between TCM and transmission connector.
3 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). NOTE: If the ambient temperature is below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature. Disconnect the connector from transmission. Measure the resistance between transmission connector terminals. Connector & terminal (T4) No. 11 - No. 15	Is the resistance between 300 - 800 ohms?	Go to step 4 .	Go to step 7 .
4 CHECK ATF TEMPERATURE SENSOR . Measure the resistance between transmission connector terminals. Connector & terminal (T4) No. 11 - No. 15	Does the resistance value increase while the ATF temperature decreases?	Go to step 5 .	Go to step 7 .
5 CHECK INPUT SIGNAL FOR TCM USING SUBARU SELECT MONITOR . Connect the connector to transmission. Connect the Subaru Select Monitor to the data link 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 in the ATF temperature sensor and transmission connector harness, and repair the fault location.	Go to step 6 .
6 CHECK POOR CONTACT .	Is there poor contact in ATF temperature sensor circuit?	Repair the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
7 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND ATF TEMPERATURE SENSOR . Turn the ignition switch to OFF. Disconnect the connector from transmission. Remove the transmission connector from bracket. Lift up the vehicle. Drain the automatic transmission fluid. CAUTION: Do not drain ATF until it cools down. Remove the oil pan, and disconnect the connector from the control valve. Measure the resistance of harness between ATF temperature sensor and transmission connector. Connector & terminal (T4) No. 11 - (AT2) No. 4	Is the resistance less than 1 ohms?	Go to step 8 .	Repair the open circuit of harness between ATF temperature sensor and transmission connector.
8 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND ATF TEMPERATURE SENSOR . Measure the resistance of harness between ATF temperature sensor and transmission connector. Connector & terminal (T4) No. 15 - (AT2) No. 9	Is the resistance less than 1 ohms?	Go to step 9 .	Repair the open circuit of harness between ATF temperature sensor and transmission connector.
9 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND ATF TEMPERATURE SENSOR . Measure the resistance of harness between transmission connector and transmission ground. Connector & terminal (T4) No. 11 - Transmission ground	Is the resistance 1 Mohms or more?	Go to step 10 .	Repair the short circuit of harness between ATF temperature sensor and transmission connector.
10 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND ATF TEMPERATURE SENSOR . Measure the resistance of harness between transmission connector and transmission ground. Connector & terminal (T4) No. 15 - 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 ATF temperature sensor and transmission connector.

NOTE
If the ambient temperature is below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

Input signal circuit to ATF temperature sensor is shorted.

Excessive shift shock

Input signal circuit of TCM is open or shorted.

Excessive shift shock

Scheme 62

Scheme 62: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK TORQUE CONVERTER TURBINE SPEED SENSOR . Turn the ignition switch to OFF. Disconnect the connector from transmission. Measure the resistance between transmission connector receptacle's terminals. Connector & terminal (T4) No. 5 - No. 10	Is the resistance between 450 - 650 ohms?	Go to step 2 .	Replace the torque converter turbine speed sensor. Refer to TORQUE CONVERTER TURBINE SPEED SENSOR .
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION . Disconnect the connector from TCM. Measure the resistance of the harness between TCM connector and transmission connector. Connector & terminal (B55) No. 1 - (B11) No. 5	Is the resistance less than 1 ohms.?	Go to step 3 .	Repair the open circuit of harness between TCM and transmission connector.
3 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION . Measure the resistance of the harness between TCM connector and transmission connector. Connector & terminal (B55) No. 2 - (B11) No. 10	Is the resistance less than 1 ohms?	Go to step 4 .	Repair the open circuit of harness between TCM and transmission connector, and poor contact of the connector.
4 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION . Measure the resistance of the harness between TCM connector and chassis ground. Connector & terminal (B55) No. 2 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 5 .	Repair the short circuit of harness between TCM and transmission connector.
5 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION . Measure the resistance of the harness between TCM connector and chassis ground. Connector & terminal (B55) No. 1 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 6 .	Repair the short circuit of the harness between TCM and transmission connector, and poor contact of connector.
6 CHECK INPUT SIGNAL FOR TCM USING SUBARU SELECT MONITOR . Connect the connectors to TCM and transmission. Connect the Subaru Select Monitor to the data link connector. Turn the ignition switch to ON. Run the Subaru Select Monitor. Start the engine. Move the select lever to the "P" or "N" range. Read the data of "Turbine Revolution Speed" using Subaru Select Monitor. Compare the tachometer with Subaru Select Monitor indications.	Is the revolution value same as the tachometer reading shown on the combination meter?	Check for poor contact in the TCM and transmission harness or connectors, and repair the fault location.	Go to step 7 .
7 CHECK POOR CONTACT .	Is there poor contact in torque converter turbine speed sensor circuit?	Repair the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .

DIAGNOSTIC PROCEDURE

Brake switch malfunction, open input signal circuit

Gear is not shifted down when driving a down hill.
Neutral control does not operate.

Scheme 63

Scheme 63: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK DTC .	Is DTC of CAN communication displayed?	Perform diagnosis according to the DTC.	Go to step 2 .
2 CHECK FUSE (NO. 8) . Turn the ignition switch to OFF. Remove the fuse (No. 8).	Is the fuse (No. 8) blown out?	Replace the fuse (No. 8). If the replaced fuse (No. 8) has blown out easily, repair the short circuit of harness between fuse (No. 8) and stop light switch.	Go to step 3 .
3 CHECK FUSE . Remove the fuse (7.5A) in the relay block.	Is the fuse (7.5A) blown out?	Replace the fuse (7.5A). If the replaced fuse (7.5A) blows out easily, repair the short circuit in the harness between the fuse (7.5A) and the TCM.	Go to step 4 .
4 CHECK BODY INTEGRATED UNIT . Turn the ignition switch to OFF. Connect the Subaru Select Monitor to the 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 the Subaru Select Monitor. Refer to OPERATION , Subaru Select Monitor.	Is ON displayed?	Go to step 5 .	Go to step 6 .
5 CHECK TCM . Read the data of "Stop Light Switch" using the Subaru Select Monitor. Refer to OPERATION , Subaru Select Monitor.	Is ON displayed?	Check for poor contact in the connector or harness, and repair the fault location.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
6 CHECK BODY INTEGRATED UNIT INPUT SIGNAL . Disconnect the connector from body integrated unit. Depress the brake pedal. Measure the voltage of harness between the body integrated unit and chassis ground. Connector & terminal (B280) No. 2 (+) - Chassis ground (-)	Is the voltage 10 V or more?	Go to step 9 .	Go to step 7 .
7 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 and stop light switch. Connector & terminal (B280) No. 2 - (B65) No. 3	Is the resistance less than 1 ohms?	Go to step 8 .	Repair the open circuit of harness between body integrated unit and stop light switch.
8 CHECK HARNESS CONNECTOR BETWEEN BODY INTEGRATED UNIT AND STOP LIGHT SWITCH . Measure the resistance of harness between body integrated unit and stop light switch. Connector & terminal (B280) No. 2 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 9 .	Repair the short circuit of harness between body integrated unit and stop light switch.
9 CHECK POOR CONTACT .	Is there poor contact in input signal of brake switch?	Repair the poor contact.	Check the body integrated unit.

DIAGNOSTIC PROCEDURE

The vehicle speed signal is abnormal.
The harness connector between TCM and vehicle speed sensor is shorted or open.

Neutral control does not operate.
Slip lock up control does not operate.
Driving performance is poor.

Scheme 64

Scheme 64: 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 the harness between TCM connector and transmission connector. Connector & terminal (B55) No. 27 - (B11) No. 14	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 TRANSMISSION . Measure the resistance of the harness between TCM connector and transmission connector. Connector & terminal (B55) No. 16 - (B11) No. 18	Is the resistance less than 1 ohms?	Go to step 3 .	Repair the open circuit of harness between TCM and transmission connector, and poor contact of the connector.
3 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION . Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B55) No. 27 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 4 .	Repair the short circuit in the harness between the TCM and chassis ground.
4 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION . Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B55) No. 16 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 5 .	Repair the short circuit of the harness and poor contact of connectors between the TCM and chassis ground.
5 CHECK FRONT VEHICLE SPEED SENSOR . Measure the resistance between transmission connector receptacle's terminals. Connector & terminal (T4) No. 14 - No. 18	Is the resistance between 450 - 650 ohms?	Go to step 6 .	Replace the front vehicle speed sensor. Refer to FRONT VEHICLE SPEED SENSOR .
6 CHECK INPUT SIGNAL FOR TCM USING SUBARU SELECT MONITOR . Connect all connectors. Connect the Subaru Select Monitor to the data link connector. Lift up the vehicle. Turn the ignition switch to ON. Run the Subaru Select Monitor. Start the engine. Read the data of "front wheel speed" using Subaru Select Monitor. Compare the speedometer with Subaru Select Monitor indications. Slowly increase the vehicle speed to 60 km/h (37 MPH). NOTE: The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE .	Does the speedometer indication increase as the Subaru Select Monitor front wheel speed data increases?	Check for poor contact in the front vehicle speed sensor circuit harness and repair the fault location.	Go to step 7 .
7 CHECK POOR CONTACT .	Is there poor contact in front vehicle speed sensor circuit?	Repair the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .

NOTE
The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE .

DIAGNOSTIC PROCEDURE

Brake switch malfunction, open input signal circuit

Gear is not shifted down when driving a down hill.
Neutral control does not operate.

Vehicle sensor, torque converter turbine speed sensor or control valve malfunction

Shift point is too high or too low.
Excessive shift shock
Tight corner braking phenomenon occurs.
Gear is not shifted to reverse.
Gear position is held by fail safe function.

Step	Check	Yes	No
1 CHECK ACCELERATOR PEDAL POSITION SENSOR . Connect the Subaru Select Monitor to the data link connector. Turn the ignition switch to ON. Read the data of "Accel. Opening Angle" on the Subaru Select Monitor.	Does the value of accelerator pedal position sensor change from 0% to 100% smoothly when the accelerator pedal is operated from fully closed to fully open?	Go to step 2 .	Check the circuit of the accelerator pedal position sensor.
2 CHECK FRONT VEHICLE SPEED SENSOR . Lift up the vehicle. Start the engine. Set the select lever to the "D" range and slowly increase vehicle speed. NOTE: The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE .	Does the vehicle speed displayed by Subaru Select Monitor roughly correspond with vehicle speed indicated by the combination meter?	Go to step 3 .	Check the front vehicle speed sensor circuit.
3 CHECK TORQUE CONVERTER TURBINE SPEED SENSOR . Move the select lever to the "P" or "N" range. Idle the engine.	Does the value of torque converter turbine speed sensor displayed by Subaru Select Monitor roughly correspond with the value of tachometer in combination meter?	There are malfunctions in TCM, TCM connector poor contact, or transmission assembly mechanical malfunction.	Check the torque converter turbine speed sensor circuit.

NOTE
The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE .

DIAGNOSTIC PROCEDURE

Lock up clutch malfunction
Sticky valve

No lock-up occurs.

Step	Check	Yes	No
1 CHECK LOCK-UP DUTY SOLENOID CIRCUIT . Diagnose according to procedures of DTC P0743.	Is there any fault?	Repair or replace the lock up duty solenoid circuit.	Go to step 2 .
2 CHECK INHIBITOR SWITCH CIRCUIT . Diagnose according to procedures of DTC P0705.	Is there any fault?	Repair or replace the inhibitor switch circuit.	Go to step 3 .
3 CHECK STOP LIGHT SWITCH CIRCUIT . Diagnose according to procedures of DTC P0719 and P0724.	Is there any fault?	Repair or replace the stop light switch circuit.	Go to step 4 .
4 CHECK ATF TEMPERATURE SENSOR CIRCUIT . Diagnose according to procedures of DTC P0712 and P0713.	Is there any fault?	Repair or replace the ATF temperature sensor circuit.	Go to step 5 .
5 CHECK ACCELERATOR PEDAL POSITION SENSOR . Connect the Subaru Select Monitor to the data link connector. Turn the ignition switch to ON. Read the data of "Accel Opening Angle" using the Subaru Select Monitor.	Does the value of accelerator pedal position sensor change from 0% to 100% smoothly when the accelerator pedal is operated from fully closed to fully open?	Go to step 6 .	Check the accelerator pedal position sensor circuit.
6 CHECK TORQUE CONVERTER TURBINE SPEED SENSOR . Move the select lever to the "P" or "N" range. Idle the engine.	Does the value of turbine speed displayed by Subaru Select Monitor almost correspond with the value of the tachometer?	Go to step 7 .	Check the torque converter turbine speed sensor circuit.
7 CHECK ENGINE SPEED SIGNAL . Idle the engine.	Does the value of engine speed displayed by the Subaru Select Monitor almost correspond with the value of the tachometer?	There is transmission assembly mechanical malfunction.	Check the engine speed signal circuit.

DIAGNOSTIC PROCEDURE

Output signal circuit of lock-up duty solenoid is open or shorted.

No lock-up occurs. (After engine is warmed-up)

Scheme 65

Scheme 65: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK DTC .	Are DTCs other than P0743 displayed?	Perform diagnosis according to the DTC.	Go to step 2 .
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION . Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of the harness between TCM connector and transmission connector. Connector & terminal (B55) No. 6 - (B11) No. 12	Is the resistance less than 1 ohms?	Go to step 3 .	Repair the open circuit of harness between TCM and transmission connector.
3 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION . Measure the resistance of the harness connector between TCM connector and chassis ground. Connector & terminal (B55) No. 6 - 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 LOCK-UP DUTY SOLENOID . Measure the resistance between transmission connector receptacle's terminals. Connector & terminal (T4) No. 12 - No. 20	Is the resistance between 2.0 - 6.0 ohms?	Go to step 5 .	Go to step 8 .
5 CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR . Connect the connectors to TCM and transmission. Lift up the vehicle. Connect the Subaru Select Monitor to the data link connector. Start the engine. Run the Subaru Select Monitor. Warm-up the engine until the ATF temperature exceeds 80°C (176°F). NOTE: If the ambient temperature is below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature. Read the data of "Lock Up Duty Ratio" using Subaru Select Monitor. Set the select lever to the "D" range, and slowly increase vehicle speed to 60 km/h (37 MPH). NOTE: The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE .	Is the measured value 95%?	Go to step 6 .	Go to step 7 .
6 CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR . Return the engine speed to idling, set the select lever to the "N" range and read the data. NOTE: The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE .	Is the measured value 0%?	Check for poor contact in the TCM and transmission harness or connectors, and repair the fault location.	Go to step 7 .
7 CHECK POOR CONTACT .	Is there poor contact in lock-up duty solenoid circuit?	Repair the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
8 CHECK LOCK-UP DUTY SOLENOID (IN TRANSMISSION) . Disconnect the transmission connector. Drain the automatic transmission fluid. CAUTION: Do not drain ATF until it cools down. Remove the oil pan, and disconnect the connector from control valve body. Measure the resistance between lock-up duty solenoid and transmission ground. Connector & terminal (AT2) No. 6 - Transmission ground	Is the resistance between 2.0 - 6.0 ohms?	Go to step 9 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
9 CHECK HARNESS CONNECTOR BETWEEN LOCK-UP DUTY SOLENOID AND TRANSMISSION . Measure the resistance of harness between lock-up duty solenoid and transmission connector. Connector & terminal (T4) No. 12 - (AT2) No. 6	Is the resistance less than 1 ohms?	Go to step 10 .	Repair the open circuit of harness between TCM and transmission connector.
10 CHECK HARNESS CONNECTOR BETWEEN LOCK-UP DUTY SOLENOID AND TRANSMISSION . Measure the resistance of harness between transmission connector and transmission ground. Connector & terminal (T4) No. 12 - Transmission ground	Is the resistance 1 Mohms or more?	Check for poor contact in the lock up duty solenoid and transmission harness or connectors, and repair the fault location.	Repair the short circuit of harness between lock-up duty solenoid and transmission connector.

NOTE
If the ambient temperature is below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature.

NOTE
The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE .

NOTE
The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE .

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

Output signal circuit of line pressure linear solenoid is open or shorted.

Excessive shift shock

Scheme 66

Scheme 66: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION . Turn the ignition switch to OFF. Disconnect the connector from transmission and TCM. Measure the resistance of the harness between TCM connector and transmission connector. Connector & terminal (B55) No. 3 - (B11) No. 2: (B55) No. 4 - (B11) No. 1	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 the harness between TCM connector and chassis ground. Connector & terminal (B55) No. 3 - Chassis ground: (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 LINE PRESSURE LINEAR SOLENOID . Measure the resistance between transmission connector receptacle's terminals. Connector & terminal (T4) No. 1 - No. 2	Is the resistance between 4 - 8 ohms?	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .	Go to step 4 .
4 CHECK LINE PRESSURE LINEAR SOLENOID (IN TRANSMISSION) . Remove the transmission connector from bracket. Drain the automatic transmission fluid. CAUTION: Do not drain ATF until it cools down. Remove the oil pan, and disconnect the connector from control valve body. Measure the resistance of line pressure linear solenoid connector terminals. Connector & terminal (AT2) No. 5 - No. 10	Is the resistance between 4 - 8 ohms?	Go to step 5 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
5 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND LINE PRESSURE LINEAR SOLENOID . Measure the resistance of harness between line pressure linear solenoid and transmission connector. Connector & terminal (T4) No. 2 - (AT2) No. 10: (T4) No. 1 - (AT2) No. 5	Is the resistance less than 1 ohms?	Go to step 6 .	Repair the open circuit of harness between line pressure linear solenoid and transmission connector.
6 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND LINE PRESSURE LINEAR SOLENOID . Measure the resistance of harness between transmission connector and transmission ground. Connector & terminal (T4) No. 1 - Transmission ground: (T4) No. 2 - Transmission ground	Is the resistance 1 Mohms or more?	Check for poor contact in the line pressure linear solenoid and transmission harness or connectors, and repair the fault location.	Repair the short circuit of harness between line pressure linear solenoid and transmission connector.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

Output signal circuit of low clutch duty solenoid is open or shorted.

Excessive shift shock

Scheme 67

Scheme 67: 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 and transmission connector. Connector & terminal (B54) No. 7 - (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 TRANSMISSION . Measure the resistance of harness between TCM connector and transmission ground. Connector & terminal (B54) 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 LOW CLUTCH DUTY SOLENOID . Measure the resistance between transmission connector terminals. Connector & terminal (T4) No. 4 - No. 20	Is the resistance between 2.0 - 6.0 ohms?	Go to step 5 .	Go to step 4 .
4 CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR . Connect the connectors to TCM and transmission. Connect the Subaru Select Monitor to the data link connector. Start the engine. Run the Subaru Select Monitor. Warm-up the transmission until the ATF temperature exceeds approximately 80°C (176°F). NOTE: If the ambient temperature falls below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature. Stop the engine. Turn the ignition switch to ON. Set the select lever to the "P" or "N" range, and depress the accelerator pedal. Read the data of "Low Clutch Duty Ratio" using Subaru Select Monitor.	Is the measured value 100%?	Go to step 5 .	Go to step 7 .
5 CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR . Turn the ignition switch to ON. Set the select lever to the "D" range. Read the data of "Low Clutch Duty Ratio".	Is the measured value 0%?	Check for poor contact in the TCM and transmission harness or connectors, and repair the fault location.	Go to step 6 .
6 CHECK POOR CONTACT .	Is there poor contact in low clutch duty solenoid circuit?	Repair the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
7 CHECK LOW CLUTCH DUTY SOLENOID (IN TRANSMISSION) . Remove the transmission connector from bracket. Drain the automatic transmission fluid. CAUTION: Do not drain ATF until it cools down. Remove the oil pan, and disconnect the connector from control valve body. Measure the resistance between low clutch duty solenoid connector and transmission ground. Connector & terminal (AT2) No. 2 - Transmission ground	Is the resistance between 2.0 - 6.0 ohms?	Go to step 8 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
8 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND LOW CLUTCH DUTY SOLENOID . Measure the resistance of harness between low clutch duty solenoid and transmission connector. Connector & terminal (T4) No. 4 - (AT2) No. 2	Is the resistance less than 1 ohms?	Go to step 9 .	Repair the open circuit of harness between low clutch duty solenoid and transmission connector.
9 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND LOW CLUTCH DUTY SOLENOID . Measure the resistance of harness between transmission connector and transmission ground. Connector & terminal (T4) No. 4 - Transmission ground	Is the resistance 1 Mohms or more?	Check for poor contact in the low clutch duty solenoid and transmission harness or connectors, and repair the fault location.	Repair the short circuit of harness between low clutch duty solenoid and transmission connector.

NOTE
If the ambient temperature falls below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

Output signal circuit of 2-4 brake duty solenoid is open or shorted.

Excessive shift shock

Scheme 68

Scheme 68: 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 the harness between TCM connector and transmission connector. Connector & terminal (B54) No. 4 - (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 (B54) 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 2-4 BRAKE DUTY SOLENOID . Measure the resistance between transmission connector terminals. Connector & terminal (T4) No. 3 - No. 20	Is the resistance between 2.0 - 6.0 ohms?	Go to step 4 .	Go to step 7 .
4 CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR . Connect all connectors. Connect the Subaru Select Monitor to the data link connector. Start the engine. Run the Subaru Select Monitor. Warm-up the transmission until the ATF temperature exceeds approximately 80°C (176°F). NOTE: If the ambient temperature falls below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature. Stop the engine. Turn the ignition switch to ON. Set the select lever to the "N" range, and depress the accelerator pedal. Read the data of "Brake Clutch Duty Ratio" using Subaru Select Monitor.	Is the measured value 100%?	Go to step 5 .	Go to step 6 .
5 CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR . Shift the select lever to 2nd on manual mode.	Is the measured value 0%?	Check for poor contact in the TCM and transmission harness or connectors, and repair the fault location.	Go to step 6 .
6 CHECK POOR CONTACT .	Is there poor contact in 2-4 brake duty solenoid circuit?	Repair the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
7 CHECK 2-4 BRAKE DUTY SOLENOID (IN TRANSMISSION) . Remove the transmission connector from bracket. Drain the automatic transmission fluid. CAUTION: Do not drain ATF until it cools down. Remove the oil pan, and disconnect the connector from control valve body. Measure the resistance of harness between 2-4 brake duty solenoid connector and transmission ground. Connector & terminal (AT2) No. 8 - Transmission ground	Is the resistance between 2.0 - 6.0 ohms?	Go to step 8 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
8 CHECK HARNESS CONNECTOR BETWEEN 2-4 BRAKE DUTY SOLENOID AND TRANSMISSION . Measure the resistance of harness between 2-4 brake duty solenoid and transmission connector. Connector & terminal (T4) No. 3 - (AT2) No. 8	Is the resistance less than 1 ohms?	Go to step 9 .	Repair the open circuit of harness between 2-4 brake duty solenoid and transmission connector.
9 CHECK HARNESS CONNECTOR BETWEEN 2-4 BRAKE DUTY SOLENOID AND TRANSMISSION . Measure the resistance of harness between transmission connector and transmission ground. Connector & terminal (T4) No. 3 - Transmission ground	Is the resistance 1 Mohms or more?	Check for poor contact in the 2-4 brake duty solenoid and transmission harness or connectors, and repair the fault location.	Repair the short circuit of harness between 2-4 brake duty solenoid and transmission connector.

NOTE
If the ambient temperature falls below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

Output signal circuit of high clutch duty solenoid is open or shorted.

Excessive shift shock

Scheme 69

Scheme 69: 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 the harness between TCM connector and transmission connector. Connector & terminal (B54) No. 6 - (B11) No. 7	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 TRANSMISSION . Measure the resistance of the harness connector between TCM connector and chassis ground. Connector & terminal (B54) 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 HIGH CLUTCH DUTY SOLENOID . Measure the resistance between transmission connector receptacle's terminals. Connector & terminal (T4) No. 7 - No. 20	Is the resistance between 2.0 - 6.0 ohms?	Go to step 4 .	Go to step 7 .
4 CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR . Connect the connectors to TCM and transmission. Lift up the vehicle. Connect the Subaru Select Monitor to the data link connector. Start the engine. Run the Subaru Select Monitor. Warm-up the engine until the ATF temperature exceeds 80°C (176°F). NOTE: If the ambient temperature is below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature. Read the data of "High Clutch Duty" using Subaru Select Monitor. Set the select lever to the "D" range, and slowly increase vehicle speed to measure in 3rd or 4th gear. NOTE: The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE .	Is the measured value 0%?	Go to step 5 .	Go to step 6 .
5 CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR . Return the engine speed to idling and set the select lever to the "N" range. NOTE: The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE .	Is the measured value 100%?	Check for poor contact in the TCM and transmission harness or connectors, and repair the fault location.	Go to step 6 .
6 CHECK POOR CONTACT .	Is there poor contact in high clutch duty solenoid circuit?	Repair the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
7 CHECK HIGH CLUTCH DUTY SOLENOID (IN TRANSMISSION) . Remove the transmission connector from bracket. Drain the automatic transmission fluid. CAUTION: Do not drain ATF until it cools down. Remove the oil pan, and disconnect the connector from control valve body. Measure the resistance between high clutch duty solenoid connector and transmission ground. Connector & terminal (AT2) No. 3 - Transmission ground	Is the resistance between 2.0 - 6.0 ohms?	Go to step 8 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
8 CHECK HARNESS CONNECTOR BETWEEN HIGH CLUTCH DUTY SOLENOID AND TRANSMISSION . Measure the resistance of harness between high clutch duty solenoid and transmission connector. Connector & terminal (T4) No. 7 - (AT2) No. 3	Is the resistance less than 1 ohms?	Go to step 9 .	Repair the open circuit of harness between TCM and transmission connector.
9 CHECK HARNESS CONNECTOR BETWEEN HIGH CLUTCH DUTY SOLENOID AND TRANSMISSION . Measure the resistance of harness between transmission connector and transmission ground. Connector & terminal (T4) No. 7 - Transmission ground	Is the resistance 1 Mohms or more?	Check for poor contact in the high clutch duty solenoid and transmission harness or connectors, and repair the fault location.	Repair the short circuit of harness between high clutch duty solenoid and transmission connector.

NOTE
If the ambient temperature is below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature.

NOTE
The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE .

NOTE
The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE .

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

The output signal circuit of low & reverse duty solenoid is open or shorted.

Gear is not changed.

Scheme 70

Scheme 70: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION . Turn the ignition switch to OFF. Disconnect the connector from transmission and TCM. Measure the resistance of the harness between TCM connector and transmission connector. Connector & terminal (B54) No. 5 - (B11) No. 6	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 the harness between TCM connector and chassis ground. Connector & terminal (B54) 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 LOW & REVERSE DUTY SOLENOID . Measure the resistance between transmission connector terminals. Connector & terminal (T4) No. 6 - No. 20	Is the resistance between 2.0 - 6.0 ohms?	Go to step 4 .	Go to step 7 .
4 CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR . Connect all connectors. Connect the Subaru Select Monitor to the data link connector. Start the engine. Run the Subaru Select Monitor. Warm-up the transmission until the ATF temperature exceeds approximately 80°C (176°F). NOTE: If the ambient temperature falls below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature. Stop the engine. Turn the ignition switch to ON. Set the select lever to "N" range. Read the data of "L&R/B Duty" using Subaru Select Monitor.	Is the measured value 100%?	Go to step 5 .	Go to step 6 .
5 CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR . Lift up the vehicle. Set the select lever to manual mode, and then hold it in 1st gear. Slowly increase the vehicle speed up to 15 km/h (9 MPH), and then return the accelerator pedal. NOTE: The speed difference between the front and rear wheels will illuminate the ABS warning light or VDC warning light, but this does not indicate a malfunction. If the warning light illuminates, delete the ABS or VDC memory of the on-board diagnosis system after completing the AT control diagnosis. Refer to CLEAR MEMORY MODE . Read the data of the low & reverse duty solenoid.	Is the measured value 55%?	Check for poor contact in the TCM and transmission harness or connectors, and repair the fault location.	Go to step 6 .
6 CHECK POOR CONTACT .	Is there poor contact in the low & reverse duty solenoid circuit?	Repair the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
7 CHECK LOW & REVERSE BRAKE DUTY SOLENOID (IN TRANSMISSION) . Remove the transmission connector from bracket. Drain the automatic transmission fluid. CAUTION: Do not drain ATF until it cools down. Remove the oil pan, and disconnect the connector from control valve body. Measure the resistance between low & reverse duty solenoid connector and transmission ground. Connector & terminal (AT2) No. 1 - Transmission ground	Is the resistance between 2.0 - 6.0 ohms?	Go to step 8 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
8 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND LOW & REVERSE DUTY SOLENOID . Measure the resistance of harness between low & reverse duty solenoid and transmission connector. Connector & terminal (T4) No. 6 - (AT2) No. 1	Is the resistance less than 1 ohms.?	Go to step 9 .	Repair open circuit of harness between low & reverse duty solenoid and transmission connector.
9 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND LOW&REVERSE DUTY SOLENOID . Measure the resistance of harness between transmission connector and transmission ground. Connector & terminal (T4) No. 6 - Transmission ground	Is the resistance 1 Mohms or more?	Check for poor contact in the low & reverse duty solenoid and transmission harness or connectors, and repair the fault location.	Repair the short circuit of the harness between the low & reverse duty solenoid and the transmission connector.

NOTE
If the ambient temperature falls below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature.

NOTE
The speed difference between the front and rear wheels will illuminate the ABS warning light or VDC warning light, but this does not indicate a malfunction. If the warning light illuminates, delete the ABS or VDC memory of the on-board diagnosis system after completing the AT control diagnosis. Refer to CLEAR MEMORY MODE .

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

Shift lock solenoid malfunction, open or short reverse inhibitor control circuit

Gear is shifted from "N" range to "R" range during driving at 20 km/h (12 MPH) or more.
Gear cannot be selected from "N" range to "R" range.

Scheme 71

Scheme 71: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK SHIFT LOCK SOLENOID . Force start the integrated unit, and check the operation of shift lock solenoid. (Refer to READ DIAGNOSTIC TROUBLE CODE (DTC) . ) Operate the select lever without depressing the brake pedal.	Does the select lever operate?	Go to step 2 .	Go to step 3 .
2 CHECK OUTPUT SIGNAL OF INTEGRATED UNIT . Using the Subaru Select Monitor, display the following items. Key-lock warning SW Shift Position PSW Stop Light Switch Step on the brake and 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 (B279) No. 12 - 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 and chassis ground. Connector & terminal (B117) No. 4 - Chassis ground	Is the resistance less than 1 ohms?	Go to step 5 .	Repair the open circuit of harness between chassis ground and shift lock solenoid connector.
5 CHECK SHIFT LOCK SOLENOID . Measure the resistance of shift lock solenoid terminals. Connector & terminal (B117) No. 3 - No. 4	Is the resistance between 7 - 21 ohms?	Go to step 6 .	Replace the shift lock solenoid.
6 CHECK OUTPUT SIGNAL OF BODY INTEGRATED UNIT . Connect all connectors. Turn the ignition switch to ON. Set the select lever to the "D" range while stepping on the brake pedal. Measure the voltage between body integrated unit and chassis ground. Connector & terminal (B279) No. 12 (+) - 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. Set the select lever to the "D" range and slowly increase vehicle speed to above 20 km/h (12 MPH). NOTE: The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE . Measure the voltage between body integrated unit and chassis ground. Connector & terminal (B279) No. 12 (+) - Chassis ground (-)	Is the voltage less than 1 V?	Check for poor contact in the reverse inhibitor control circuit harness or connectors, and repair the fault location.	Go to step 8 .
8 CHECK POOR CONTACT .	Is there poor contact in the reverse inhibitor control circuit?	Repair the poor contact.	Replace the body integrated unit. Refer to BODY INTEGRATED UNIT .

NOTE
The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE .

DIAGNOSTIC PROCEDURE

Input signal circuit of TCM is open or shorted.

No lock up or tight corner braking phenomenon is occurred.

Scheme 72

Scheme 72: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK IGNITION POWER SUPPLY CIRCUIT . Turn the ignition switch to OFF. Disconnect the connector from rear vehicle speed sensor. Turn the ignition switch to ON. Measure the ignition power supply voltage between rear vehicle speed sensor connector and transmission ground. Connector & terminal (AT4) No. 3 (+) - Transmission ground (-)	Is the voltage 10 V or more?	Go to step 2 .	Check for open circuits, shorts or poor contact in the harness between the rear vehicle speed sensor and battery, and perform repairs.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION . Turn the ignition switch to OFF. Measure the resistance of harness between TCM connector and rear vehicle speed sensor connector. Connector & terminal (B55) No. 15 - (AT4) No. 1	Is the resistance less than 1 ohms?	Go to step 3 .	Repair the open circuit or poor contact of the connector in harness between TCM and rear vehicle speed sensor connector.
3 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION . Measure the resistance of harness between TCM connector and rear vehicle speed sensor connector. Connector & terminal (B55) No. 26 - (AT4) No. 2	Is the resistance less than 1 ohms?	Go to step 4 .	Repair the open circuit or poor contact of the connector in harness between TCM and rear vehicle speed sensor connector.
4 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION . Measure the resistance of the harness between TCM connector and chassis ground. Connector & terminal (B55) No. 15 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 5 .	Repair the short circuit of harness between TCM and rear vehicle speed sensor connector.
5 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION . Measure the resistance of the harness between TCM connector and chassis ground. Connector & terminal (B55) No. 26 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 6 .	Repair the short circuit of harness between TCM and rear vehicle speed sensor connector.
6 CHECK INPUT SIGNAL FOR TCM . Connect the connectors to TCM and transmission. Lift up the vehicle. Start the engine and drive the vehicle at 20 km/h (12 MPH). NOTE: The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE . Measure the AC voltage between TCM connector terminals. Connector & terminal (B55) No. 26 (+) - No. 15 (-)	Is the voltage approx. 2 V or more?	Go to step 7 .	Replace the rear vehicle speed sensor.
7 CHECK POOR CONTACT .	Is there poor contact in rear vehicle speed sensor circuit?	Repair the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .

NOTE
The speed difference between the front and rear wheels will illuminate the ABS warning light or 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. Refer to CLEAR MEMORY MODE .

DIAGNOSTIC PROCEDURE

Output signal circuit of transfer duty solenoid is open or shorted.

Tight corner braking phenomenon occurs.
Front wheel slips on slippery roads.

Scheme 73

Scheme 73: 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 the harness between TCM connector and transmission connector. Connector & terminal (B55) No. 5 - (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 TRANSMISSION . Measure the resistance of harness connector between TCM 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 TRANSFER DUTY SOLENOID . Measure the resistance between transmission connector and transmission terminals. Connector & terminal (T4) No. 8 - No. 20	Is the resistance between 2.0 - 6.0 fi?	Go to step 4 .	Go to step 7 .
4 CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR . Connect the connectors to TCM and transmission. Connect the Subaru Select Monitor to the data link connector. Turn the ignition switch to ON. Run the Subaru Select Monitor. Set the select lever to the "N" range, and fully close the throttle. (Vehicle speed is 0 km/h (0 MPH)) Using Subaru Select Monitor, read the data of "Transfer Duty Ratio".	Is the value approx. 5%?	Go to step 5 .	Go to step 6 .
5 CHECK OUTPUT SIGNAL FROM TCM USING SUBARU SELECT MONITOR . Set the select lever to the "D" range. Using Subaru Select Monitor, read the data of "Transfer Duty Ratio".	Is the measured value approx. 18 - 35%?	Check for poor contact in the TCM and transmission harness or connectors, and repair the fault location.	Go to step 6 .
6 CHECK POOR CONTACT .	Is there poor contact in transfer duty solenoid circuit?	Repair the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
7 CHECK TRANSFER DUTY SOLENOID (IN TRANSMISSION) . Lift up the vehicle. Drain the automatic transmission fluid. CAUTION: Do not drain ATF until it cools down. Remove the extension case, and disconnect the connector from transfer duty solenoid. Measure the resistance between transfer duty solenoid connector and transmission ground. Connector & terminal (AT2) No. 7 - Transmission ground	Is the resistance between 2.0 - 6.0 ohms?	Go to step 8 .	Replace the control valve body. Refer to CONTROL VALVE BODY .
8 CHECK HARNESS CONNECTOR BETWEEN TRANSFER DUTY SOLENOID AND TRANSMISSION . Measure the resistance of harness between transfer duty solenoid and transmission connector. Connector & terminal (T4) No. 8 - (AT2) No. 7	Is the resistance less than 1 ohms?	Go to step 9 .	Repair the open circuit of harness between transfer duty solenoid and transmission connector.
9 CHECK HARNESS CONNECTOR BETWEEN TRANSFER DUTY SOLENOID AND TRANSMISSION . Measure the resistance of harness between transmission connector and transmission ground. Connector & terminal (T4) No. 8 - Transmission ground	Is the resistance 1 Mohms or more?	Check for poor contact in the transfer duty solenoid and transmission harness or connectors, and repair the fault location.	Repair short circuit of the harness between the transfer duty solenoid and transmission connector.

CAUTION
Do not drain ATF until it cools down.

DIAGNOSTIC PROCEDURE

Input signal circuit of SPORT shift switch is shorted.

Manual mode can not be set.
ATF temperature warning light does not illuminate.
No SPORT mode occurs.

Scheme 74

Scheme 74: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK BODY INTEGRATED UNIT . Connect the Subaru Select Monitor to the data link connector. Turn the ignition switch to ON. Read the DTC of the body integrated unit using the Subaru Select Monitor. Refer to OPERATION , Subaru Select Monitor.	Is DTC displayed?	Perform diagnosis according to the DTC.	Go to step 2 .
2 CHECK BODY INTEGRATED UNIT INPUT SIGNAL . Move the select lever to "P" range. Read the "Tiptronic Mode Switch" data of the body integrated unit using the Subaru Select Monitor. Refer to OPERATION , Subaru Select Monitor.	Is OFF displayed?	Go to step 3 .	Go to step 7 .
3 CHECK BODY INTEGRATED UNIT INPUT SIGNAL . Move the select lever from the "P" range to the "D" range. Read the "Tiptronic Mode Switch" data of the body integrated unit using the Subaru Select Monitor. Refer to OPERATION , Subaru Select Monitor.	Is the indication on each range OFF?	Go to step 4 .	Replace the select lever assembly. Refer to SELECT LEVER .
4 CHECK BODY INTEGRATED UNIT INPUT SIGNAL . Shift the select lever to the SPORT mode side. Set the select lever to a range other than "D". Read the "Tiptronic Mode Switch" data of the body integrated unit using the Subaru Select Monitor. Refer to OPERATION , Subaru Select Monitor.	Is OFF displayed?	Go to step 5 .	Replace the select lever assembly. Refer to SELECT LEVER .
5 CHECK INHIBITOR SWITCH . Move the select lever from the "P" range to the "D" range.	Is the indication of range position indicator light in combination meter synchronized with position of select lever?	Go to step 6 .	Adjust the inhibitor switch and select cable. Refer to ADJUSTMENT , Inhibitor Switch. Refer to ADJUSTMENT , Select Cable.
6 CHECK INPUT SIGNAL FROM TCM . Move the select lever from the "P" range to the "D" range. Read the "Tiptronic Mode Switch" data of the TCM using the Subaru Select Monitor. Refer to OPERATION , Subaru Select Monitor.	Is the indication on each range OFF?	Check for short circuits in the harness or connectors, and repair the fault location.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
7 CHECK HARNESS BETWEEN TCM AND SPORT SHIFT SWITCH . Turn the ignition switch to OFF. Disconnect the harness connectors from the TCM and select lever. Measure the resistance between TCM and chassis ground. Connector & terminal (B54) No. 17 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 8 .	Repair the short circuit in the harness between the TCM and sports shift switch.
8 CHECK SPORT SHIFT SWITCH . Move the select lever to "P" range. Measure the resistance between the SPORT shift switch connector terminals. Connector & terminal (B117) No. 7 - No. 8	Is the resistance 1 Mohms or more?	Check the body integrated unit.	Replace the select lever assembly. Refer to SELECT LEVER .

DIAGNOSTIC PROCEDURE

LED does not illuminate even if FWD switch is ON.
FWD signal circuit is open or shorted.

Scheme 75

Scheme 75: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK SPARE FUSE .	Is the spare fuse OK?	Go to step 2 .	Replace the fuse.
2 CHECK FWD SWITCH . Connect the Subaru Select Monitor to the data link connector.	When the fuse is inserted to FWD switch, does the LED illuminate?	Go to step 3 .	Go to step 4 .
3 CHECK COMBINATION METER .	Does the AWD warning light illuminate?	Check the SPORT shift switch. Refer to CHECK SPORT SHIFT SWITCH , Diagnostic Procedure without Diagnostic Trouble Code (DTC).	Go to step 9 .
4 CHECK HARNESS CONNECTOR BETWEEN TCM AND FWD SWITCH . Turn the ignition switch to OFF. Disconnect the connector from TCM. Measure the resistance of harness between TCM and FWD switch connector. Connector & terminal (B54) No. 10 - (B158) No. 7	Is the resistance less than 1 ohms?	Go to step 5 .	Repair the open circuit of harness between TCM and FWD switch connectors.
5 CHECK HARNESS CONNECTOR BETWEEN FWD SWITCH AND CHASSIS GROUND . Measure the resistance of harness between FWD switch and chassis ground. Connector & terminal (i5) No. 13 - Chassis ground	Is the resistance less than 1 ohms?	Go to step 6 .	Repair the open circuit of harness between FWD switch connector and chassis ground.
6 CHECK HARNESS CONNECTOR BETWEEN TCM AND FWD SWITCH . Measure the resistance of the harness connector between the TCM and chassis ground to make sure that there are no shorts in the circuit. Connector & terminal (B54) No. 10 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 7 .	Repair the short circuit of harness between TCM and FWD switch connectors.
7 CHECK INPUT SIGNAL FOR TCM . Turn the ignition switch to OFF. Connect the connector to TCM. Turn the ignition switch to ON. Measure the signal voltage for TCM while installing the fuse to FWD switch connector. Connector & terminal (B54) No. 10 (+) - Chassis ground (-)	Is the voltage less than 1 V?	Go to step 8 .	Go to step 10 .
8 CHECK INPUT SIGNAL FOR TCM . Measure the signal voltage for TCM with the fuse removed from FWD switch connector. Connector & terminal (B54) No. 10 (+) - Chassis ground (-)	Is the voltage 10.5 V or more?	Go to step 9 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
9 CHECK BODY INTEGRATED UNIT . Check DTC of body integrated unit.	Is DTC of CAN communication displayed?	Perform diagnosis according to the DTC.	Go to step 10 .
10 CHECK COMBINATION METER . Check the AWD warning light. Refer to INSPECTION , Combination Meter System.	Is the AWD warning light OK?	Go to step 11 .	Replace the combination meter assembly. Refer to COMBINATION METER .
11 CHECK POOR CONTACT .	Is there poor contact in FWD switch circuit?	Repair the poor contact.	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .

DIAGNOSTIC PROCEDURE

Input signal circuit of SPORT shift switch is open or shorted.

Does not shift on manual mode.

Scheme 76

Scheme 76: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK SPORT SHIFT SWITCH . Shift the select lever to the SPORT mode. Set and hold the select lever at the + side. Read the "Up Switch" data of the TCM using the Subaru Select Monitor. Refer to READ CURRENT DATA .	Is ON displayed?	Go to step 2 .	Go to step 3 .
2 CHECK SPORT SHIFT SWITCH . Set and hold the select lever at the - side. Read the "Down Switch" data of the TCM using the Subaru Select Monitor. Refer to READ CURRENT DATA .	Is ON displayed?	Go to the procedure "CHECK SPORT SHIFT INDICATOR". Refer to CHECK SPORT SHIFT INDICATOR , Diagnostic Procedure without Diagnostic Trouble Code (DTC).	Go to step 14 .
3 CHECK BODY INTEGRATED UNIT . Turn the ignition switch to ON. Set and hold the select lever at the + side. Read the "TIP UP SW Input" data of the body integrated unit using the Subaru Select Monitor. Refer to READ CURRENT DATA .	Is ON displayed?	Go to step 4 .	Go to step 5 .
4 CHECK BODY INTEGRATED UNIT . Check the DTC of the body integrated unit. Refer to OPERATION , Subaru Select Monitor.	Is DTC of CAN communication displayed?	Perform diagnosis according to the DTC.	Check the TCM.
5 CHECK SPORT SHIFT SWITCH GROUND CIRCUIT . Turn the ignition switch to OFF. Disconnect the connector from SPORT shift switch. Measure the resistance of harness between SPORT shift switch connector and chassis ground. Connector & terminal (B117) No. 6 - Chassis ground: (B117) No. 10 - Chassis ground	Is the resistance less than 1 ohms.?	Go to step 6 .	Repair the open circuit of the harness between the SPORT shift switch and chassis ground.
6 CHECK SPORT SHIFT SWITCH . Measure the resistance between SPORT shift switch terminals. Connector & terminal (B117) No. 6 - No. 5: (B117) No. 10 - No. 9	Is the resistance 1 Mohms or more?	Go to step 7 .	Replace the guide plate assembly.
7 CHECK SPORT SHIFT SWITCH . Set and hold the select lever at the + side. Measure the resistance between SPORT shift switch terminals. Connector & terminal (B117) No. 6 - No. 5	Is the resistance less than 1 ohms?	Go to step 8 .	Replace the guide plate assembly.
8 CHECK SPORT SHIFT SWITCH . Set and hold the select lever at the - side. Measure the resistance between SPORT shift switch terminals. Connector & terminal (B117) No. 10 - No. 9	Is the resistance less than 1 ohms?	Go to step 9 .	Replace the guide plate assembly.
9 CHECK HARNESS CONNECTOR BETWEEN TCM AND SPORT SHIFT SWITCH . Disconnect the connector from TCM. Measure the resistance of harness between TCM connector and sport shift switch connector. Connector & terminal (B117) No. 5 - (B54) No. 19: (B117) No. 9 - (B54) No. 18	Is the resistance less than 1 ohms?	Go to step 10 .	Repair the open circuit of harness between SPORT shift switch connector and TCM connector, or poor contact in connector.
10 CHECK HARNESS CONNECTOR BETWEEN TCM AND SPORT SHIFT SWITCH . Measure the resistance of harness between SPORT shift switch connector and chassis ground. Connector & terminal (B117) No. 5 - Chassis ground: (B117) No. 9 - Chassis ground	Is the resistance 1 Mohms or more?	Go to step 11 .	Repair the short circuit of the harness between the SPORT shift switch connector and TCM connector.
11 CHECK INPUT SIGNAL TO TCM . Connect all connectors. Turn the ignition switch to ON. Measure the voltage of signal to TCM. Connector & terminal (B54) No. 18 (+) - Chassis ground (-): (B54) No. 19 (+) - Chassis ground (-)	Is the voltage 1.5 - 8 V?	Go to step 12 .	Replace the TCM.
12 CHECK INPUT SIGNAL TO TCM . Set and hold the select lever at the + side. Measure the voltage of signal to TCM. Connector & terminal (B54) No. 19 (+) - Chassis ground (-)	Is the voltage less than 1 V?	Go to step 13 .	Replace the TCM.
13 CHECK INPUT SIGNAL TO TCM . Set and hold the select lever at the - side. Measure the voltage of signal to TCM. Connector & terminal (B54) No. 18 (+) - Chassis ground (-)	Is the voltage less than 1 V?	Go to step 14 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
14 CHECK BODY INTEGRATED UNIT . Turn the ignition switch to ON. Set and hold the select lever at the - side. Read the "TIP UP SW input" data of the body integrated unit using the Subaru Select Monitor. Refer to READ CURRENT DATA .	Is ON displayed?	Go to step 15 .	Replace the body integrated unit. Refer to BODY INTEGRATED UNIT .
15 CHECK POOR CONTACT .	Is there poor contact in the circuit?	Repair the poor contact.	A temporary poor contact of the circuit connector or harness.

DIAGNOSTIC PROCEDURE

Output signal circuit of SPORT shift indicator is open or shorted.

SPORT shift indicator does not display or remains displayed.
SPORT shift indicator display does not change.

Scheme 77

Scheme 77: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK BODY INTEGRATED UNIT . Check DTC of body integrated unit.	Is DTC of CAN communication displayed?	Perform diagnosis according to the DTC.	Go to step 2 .
2 CHECK TCM . Turn the ignition switch to OFF. Connect the Subaru Select Monitor to the data link connector. Turn the ignition switch to ON. Run the Subaru Select Monitor. Shift the select lever to the SPORT mode side. Read the "Gear Position" data of TCM using Subaru Select Monitor.	Is the gear position 1?	Go to step 3 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
3 CHECK TCM . Shift the select lever up. Read the "Gear Position" data of TCM using Subaru Select Monitor.	Is the gear position 2?	Go to step 4 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
4 CHECK BODY INTEGRATED UNIT . Using the Subaru Select Monitor, read the data of "Shift Position".	Is the SPORT shift gear position 2?	Go to step 5 .	Check the body integrated unit.
5 CHECK COMBINATION METER . Refer to INSPECTION , Combination Meter System.	Is the SPORT shift indicator OK?	Check the buzzer. Refer to CHECK BUZZER , Diagnostic Procedure without Diagnostic Trouble Code (DTC).	Replace the combination meter assembly. Refer to COMBINATION METER .

DIAGNOSTIC PROCEDURE

Output signal circuit of buzzer is open or shorted.

Buzzer remains beeping.

Scheme 78

Scheme 78: WIRING DIAGRAM

Step	Check	Yes	No
1 CHECK BODY INTEGRATED UNIT . Turn the ignition switch to OFF. Connect the Subaru Select Monitor to the data link connector. Turn the ignition switch to ON. Run the Subaru Select Monitor. Using the Subaru Select Monitor, read the data of "SPORT shift (buzzer 1)" and "SPORT shift (buzzer 2)".	Is ON displayed?	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .	Go to step 2 .
2 CHECK COMBINATION METER . Refer to INSPECTION , Combination Meter System.	Is the buzzer OK?	Refer to "Diagnostics with Phenomenon". Refer to DIAGNOSTICS WITH PHENOMENON .	Replace the combination meter assembly. Refer to COMBINATION METER .

DIAGNOSTIC PROCEDURE

INSPECTION

Symptom	Problem parts
Starter does not operate when select lever is in "P" or "N" range. Starter operates when select lever is in "R" or "D" range.	Inhibitor switch Select cable Select lever Starter motor and harness
Abnormal noise when select lever is in "P" or "N".	Strainer Transfer duty solenoid Oil pump Drive plate ATF level too high or too low
Hissing noise occurs during standing start.	Strainer ATF level too high or too low
Noise occurs while driving in "D1".	Final gear Planetary gear Reduction gear Differential gear oil level too high or too low
Noise occurs while driving in "D2".
Noise occurs while driving in "D3".	Final gear Low & reverse brake Reduction gear Differential gear oil level too high or too low
Noise occurs while driving in "D4".	Final gear Low & reverse brake Planetary gear Reduction gear Differential gear oil level too high or too low
Vehicle moves when select lever is in "N" range.	Select cable Inhibitor switch TCM Low clutch
Shock occurs when select lever is shifted from "N" to "D" range.	Accelerator pedal position sensor ATF temperature sensor Line pressure linear solenoid Low clutch duty solenoid Low clutch TCM Harness Control valve ATF deterioration
Excessive time lag occurs when select lever is shifted from "N" to "D" range.	Control valve Low clutch Line pressure linear solenoid Seal ring Front gasket of transmission case
Shock occurs when select lever is shifted from "N" to "R" range.	Accelerator pedal position sensor ATF temperature sensor Line pressure linear solenoid TCM Harness Control valve ATF deterioration
Excessive time lag occurs when select lever is shifted from "N" to "R" range.	Control valve Low & reverse clutch Reverse clutch Line pressure linear solenoid Seal ring Front gasket of transmission case
Vehicle does not start in any shift range. (Engine stalls)	Parking brake mechanism Planetary gear
Vehicle does not start in any shift range. (Engine operates)	Strainer Line pressure linear solenoid Control valve Drive pinion Hypoid gear Axle shaft Differential gear Oil pump Input shaft Output shaft Planetary gear Drive plate ATF level is too low Front gasket of transmission case
Vehicle does not start only in the "R" range. (Engine operates)	Select cable Select lever Line pressure linear solenoid Control valve Low & reverse clutch Reverse clutch
Vehicle does not start only in the "R" range. (Engine stalls)	Low clutch 2-4 brake Planetary gear Parking brake mechanism
Vehicle does not start in "D" range. (Engine operates)	Low clutch One-way clutch
Vehicle does not start in "D" range. (Engine stalls)	Reverse clutch
Vehicle does not start only in the "R" range. (Engine operates)	Control valve
Acceleration during standing start is poor. (High RPM stall)	Control valve Low clutch Reverse clutch ATF level is too low ATF deterioration Front gasket of transmission case Differential gear oil level too high or too low
Acceleration during standing start is poor. (Low RPM stall)	Oil pump Torque converter one-way clutch Engine performance
Acceleration is poor when select lever is in "D" range. (Normal RPM stall)	TCM Control valve High clutch 2-4 brake Planetary gear
Acceleration is poor when select lever is in "R" range. (Normal RPM stall)	Control valve High clutch 2-4 brake Planetary gear
No shift occurs from 1st to 2nd gear.	TCM Rear vehicle speed sensor Front vehicle speed sensor Accelerator pedal position sensor Control valve 2-4 brake
No shift occurs from 2nd to 3rd gear.	TCM Control valve High clutch
No shift occurs from 3rd to 4th gear.	TCM ATF temperature sensor Control valve 2-4 brake
Engine brake is not effected when the select lever is shifted from 4th gear to 3rd gear.	Inhibitor switch TCM Accelerator pedal position sensor Control valve
Engine brake is not effected when the select lever is shifted from 3rd gear to 2nd gear.	Control valve
Engine brake is not effected when the select lever is shifted from 2nd gear to 1st gear.	Control valve Low & reverse brake
Shift characteristics are erroneous.	Inhibitor switch TCM Front vehicle speed sensor Rear vehicle speed sensor Accelerator pedal position sensor Control valve Ground
No lock-up occurs.	TCM Accelerator pedal position sensor ATF temperature sensor Control valve Lock-up facing Engine speed signal
Parking brake does not function.	Select cable Select lever Parking mechanism
Shift lever cannot be moved or is hard to move from "P" range.	Select cable Select lever Parking mechanism
ATF spurts out.	ATF level too high
Differential oil spurts out.	Differential gear oil level too high
Differential oil level changes excessively.	Seal pipe Double oil seal
Odor is produced from ATF supply pipe.	High clutch 2-4 brake Low & reverse clutch Reverse clutch Lock-up facing ATF deterioration
Shock occurs when shifting from 1st to 2nd gear.	TCM Torque converter turbine speed sensor Accelerator pedal position sensor 2-4 brake duty solenoid ATF temperature sensor Line pressure linear solenoid Control valve 2-4 brake ATF deterioration Engine performance Low & reverse duty solenoid
Slippage occurs when shifting from 1st to 2nd gear.	TCM Accelerator pedal position sensor 2-4 brake duty solenoid ATF temperature sensor Line pressure linear solenoid Control valve 2-4 brake
Shock occurs when shifting from 2nd to 3rd gear.	TCM Torque converter turbine speed sensor Accelerator pedal position sensor 2-4 brake duty solenoid ATF temperature sensor Line pressure linear solenoid Low & reverse duty solenoid Control valve High clutch 2-4 brake ATF deterioration Engine performance High clutch duty solenoid
Slippage occurs when shifting from 2nd to 3rd gear.	TCM Accelerator pedal position sensor 2-4 brake duty solenoid ATF temperature sensor Line pressure linear solenoid Control valve High clutch 2-4 brake Low & reverse duty solenoid
Shock occurs when shifting from 3rd to 4th gear.	TCM Torque converter turbine speed sensor Accelerator pedal position sensor 2-4 brake duty solenoid ATF temperature sensor Line pressure linear solenoid Control valve Low clutch duty solenoid 2-4 brake ATF deterioration Engine performance
Slippage occurs when shifting from 3rd to 4th gear.	TCM Accelerator pedal position sensor 2-4 brake duty solenoid ATF temperature sensor Line pressure linear solenoid Control valve 2-4 brake
Shock occurs when shifting from 3rd to 2nd gear.	TCM Torque converter turbine speed sensor Accelerator pedal position sensor ATF temperature sensor Line pressure linear solenoid Control valve 2-4 brake duty solenoid 2-4 brake ATF deterioration High clutch duty solenoid
Shift shock occurs when shifting from 2nd to 1st gear.	TCM Torque converter turbine speed sensor Accelerator pedal position sensor ATF temperature sensor Line pressure linear solenoid Control valve Low & reverse clutch ATF deterioration 2-4 brake duty solenoid Low & reverse brake duty solenoid
Shock occurs when accelerator pedal is released from medium speed.	TCM Acceleration pedal position sensor ATF temperature sensor Line pressure linear solenoid Control valve Lock-up damper Engine performance
Vibration occurs during straight-forward operation.	TCM Lock-up duty solenoid Lock-up facing Lock-up damper
Vibration occurs during turns. (Tight corner braking phenomenon)	TCM Front vehicle speed sensor Rear vehicle speed sensor Acceleration pedal position sensor ATF temperature sensor Transfer clutch Control valve Transfer duty solenoid ATF deterioration Harness
Front wheel slippage occurs during standing starts.	TCM Front vehicle speed sensor Acceleration pedal position sensor ATF temperature sensor Control valve Transfer clutch Control valve Transfer pipe Transfer duty solenoid
It is not set in FWD mode.	TCM Transfer clutch Control valve Transfer duty solenoid
Select lever is hard to move.	Select cable Select lever Detent spring Manual plate
Select lever is excessively hard to move. (Unreasonable resistance)	Detent spring Manual plate
Select lever slips out of selected shift position during acceleration or while driving on rough terrain.	Select cable Select lever Detent spring Manual plate
Manual mode can not be set.	Sports shift switch TCM Body integrated unit
Gear does not change though the select lever is operated in manual mode.	Up shift switch Down shift switch TCM Body integrated unit

GENERAL DIAGNOSTIC CHART

Automatic Transmission 4AT (Diagnostics): Diagnosis Subaru Forester SH

DIAGNOSIS

TROUBLE SYMPTOM

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DTC DETECTING CONDITION

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INSPECTION

More articles — Automatic Transmission 4AT (Diagnostics)

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