WIRING DIAGRAM
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND COMBINATION METER CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Turn the ignition switch to ON. | Does the malfunction indicator light illuminate? | Repair the short circuit of harness between ECM and combination meter connector. | Replace the ECM. Refer to ENGINE CONTROL MODULE (ECM) . |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DELIVERY (TEST) MODE CONNECTOR. Disconnect the delivery (test) mode connector. Turn the ignition switch to ON. | Does the malfunction indicator light blink? | Go to step 2. | System is normal. NOTE: Malfunction indicator light blinks when delivery (test) mode connector is connected. |
| 2 CHECK HARNESS BETWEEN ECM AND DELIVERY (TEST) MODE CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance of harness between ECM and chassis ground. Connector&terminal (B135) No. 27 - Chassis ground | Is the resistance less than 5 ohms? | Repair the short circuit of harness between ECM and delivery (test) mode connector. | Replace the ECM. Refer to ENGINE CONTROL MODULE (ECM) . |
| NOTE |
|---|
| Malfunction indicator light blinks when delivery (test) mode connector is connected. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK POWER SUPPLY TO FRONT OXYGEN (A/F) SENSOR. Turn the ignition switch to OFF. Disconnect the connector from front oxygen (A/F) sensor. Turn the ignition switch to ON. Measure the voltage between front oxygen (A/F) sensor connector and engine ground. Connector&terminal (E22) No. 6 (+) - Engine ground (-) | Is the voltage 10 V or more? | Go to step 2. | Repair the power supply line. Or replace the main relay. NOTE: In this case, repair the following item: Open circuit in harness between A/F, oxygen sensor relay connector and front oxygen (A/F) sensor connector Poor contact of A/F, oxygen sensor relay connector Poor contact of coupling connector |
| 2 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between ECM and front oxygen (A/F) sensor connector. Connector&terminal (B136) No. 2 - (E22) No. 4: (B136) No. 3 - (E22) No. 4 | Is the resistance less than 1 ohms? | Go to step 3. | Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM and front oxygen (A/F) sensor connector Poor contact of coupling connector |
| 3 CHECK GROUND CIRCUIT FOR ECM. Measure the resistance of harness between ECM and chassis ground. Connector&terminal (B134) No. 5 - Chassis ground: (B137) No. 1 - Chassis ground: (B137) No. 2 - Chassis ground: (B137) No. 3 - Chassis ground: (B137) No. 7 - Chassis ground | Is the resistance less than 5 ohms? | Go to step 4. | Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between ECM and engine ground Poor contact of coupling connector |
| 4 CHECK FRONT OXYGEN (A/F) SENSOR. Measure the resistance between front oxygen (A/F) sensor terminals. Terminals No. 6 - No. 4 | Is the resistance 2 - 3 ohms? | Repair the poor contact of ECM connector. | Replace the front oxygen (A/F) sensor. Refer to FRONT OXYGEN (A/F) SENSOR . |
| NOTE |
|---|
| In this case, repair the following item: Open circuit in harness between A/F, oxygen sensor relay connector and front oxygen (A/F) sensor connector Poor contact of A/F, oxygen sensor relay connector Poor contact of coupling connector |
| NOTE |
|---|
| In this case, repair the following item: Open circuit in harness between ECM and front oxygen (A/F) sensor connector Poor contact of coupling connector |
| NOTE |
|---|
| In this case, repair the following item: Open circuit of harness between ECM and engine ground Poor contact of coupling connector |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR. Turn the ignition switch to OFF. Measure the voltage between ECM and chassis ground. Connector&terminal (B136) No. 2 (+) - Chassis ground (-): (B136) No. 3 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the short circuit to power in the harness between ECM and front oxygen (A/F) sensor connector. | Go to step 2. |
| 2 CHECK GROUND CIRCUIT FOR ECM. Disconnect the connectors from ECM. Measure the resistance between ECM and chassis ground. Connector&terminal (B134) No. 5 - Chassis ground: (B137) No. 1 - Chassis ground: (B137) No. 2 - Chassis ground: (B137) No. 3 - Chassis ground: (B137) No. 7 - Chassis ground | Is the resistance less than 5 ohms? | Repair the poor contact of ECM connector. | Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between ECM and engine ground Poor contact of coupling connector |
| NOTE |
|---|
| In this case, repair the following item: Open circuit of harness between ECM and engine ground Poor contact of coupling connector |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR. Turn the ignition switch to OFF. Measure the voltage between ECM and chassis ground. Connector&terminal (B136) No. 4 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the short circuit to power in the harness between ECM and rear oxygen sensor connector. | Go to step 2. |
| 2 CHECK GROUND CIRCUIT FOR ECM. Disconnect the connectors from ECM. Measure the resistance between ECM and chassis ground. Connector&terminal (B134) No. 5 - Chassis ground: (B137) No. 1 - Chassis ground: (B137) No. 2 - Chassis ground: (B137) No. 3 - Chassis ground: (B137) No. 7 - Chassis ground | Is the resistance less than 5 ohms? | Repair the poor contact of ECM connector. | Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between ECM and engine ground Poor contact of coupling connector |
| NOTE |
|---|
| In this case, repair the following item: Open circuit of harness between ECM and engine ground Poor contact of coupling connector |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND OIL SWITCHING SOLENOID VALVE. Turn the ignition switch to OFF. Disconnect the connectors from the ECM and oil switching solenoid valve. Measure the voltage between ECM and chassis ground. Connector&terminal (B137) No. 25 (+) - Chassis ground (-): (B137) No. 24 (+) - Chassis ground (-) | Is the voltage less than 1 V? | Go to step 2. | Repair the short circuit to power in the harness between ECM and oil switching solenoid valve connector. |
| 2 CHECK HARNESS BETWEEN ECM AND OIL SWITCHING SOLENOID VALVE. Measure the resistance of harness between ECM and oil switching solenoid valve connector. Connector&terminal (B137) No. 25 - (E67) No. 1: (B137) No. 24 - (E67) No. 2 | Is the resistance less than 1 ohms? | Go to step 3. | Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between ECM and oil switching solenoid valve connector Poor contact of coupling connector |
| 3 CHECK OIL SWITCHING SOLENOID VALVE. Measure the resistance between oil switching solenoid valve terminals. Terminals No. 1 - No. 2 | Is the resistance 6 - 12 ohms? | Repair the poor contact of ECM and oil switching solenoid valve connector. | Replace the oil switching solenoid valve. Refer to OIL SWITCHING SOLENOID VALVE . |
| NOTE |
|---|
| In this case, repair the following item: Open circuit of harness between ECM and oil switching solenoid valve connector Poor contact of coupling connector |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND OIL SWITCHING SOLENOID VALVE. Turn the ignition switch to OFF. Disconnect the connectors from the ECM and oil switching solenoid valve. Measure the voltage between ECM and chassis ground. Connector&terminal (B137) No. 31 (+) - Chassis ground (-): (B137) No. 30 (+) - Chassis ground (-) | Is the voltage less than 1 V? | Go to step 2. | Repair the short circuit to power in the harness between ECM and oil switching solenoid valve connector. |
| 2 CHECK HARNESS BETWEEN ECM AND OIL SWITCHING SOLENOID VALVE. Measure the resistance between ECM and oil switching solenoid valve connector. Connector&terminal (B137) No. 31 - (E68) No. 1: (B137) No. 30 - (E68) No. 2 | Is the resistance less than 1 ohms? | Go to step 3. | Repair the harness and connector. NOTE: in this case, repair the following item: Open circuit of harness between ECM and oil switching solenoid valve connector Poor contact of coupling connector |
| 3 CHECK OIL SWITCHING SOLENOID VALVE. Measure the resistance between oil switching solenoid valve terminals. Terminals No. 1 - No. 2 | Is the resistance 6 - 12 ohms? | Repair the poor contact of ECM and oil switching solenoid valve connector. | Replace the oil switching solenoid valve. Refer to OIL SWITCHING SOLENOID VALVE . |
| NOTE |
|---|
| In this case, repair the following item: Open circuit of harness between ECM and oil switching solenoid valve connector Poor contact of coupling connector |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK CURRENT DATA. Start the engine. Read the data of air flow sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the voltage less than 0.2 V? | Go to step 2. | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. |
| 2 CHECK POWER SUPPLY OF MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR. Turn the ignition switch to OFF. Disconnect the connectors from the mass air flow and intake air temperature sensor. Turn the ignition switch to ON. Measure the voltage between mass air flow and intake air temperature sensor connector and engine ground. Connector&terminal (B3) No. 3 (+) - Engine ground (-) | Is the voltage 10 V or more? | Go to step 3. | Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between main relay and mass air flow and intake air temperature sensor connector Poor contact of main relay connector |
| 3 CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance of harness between ECM and the mass air flow and intake air temperature sensor connector. Connector&terminal (B135) No. 26 - (B3) No. 5 | Is the resistance less than 1 ohms? | Go to step 4. | Repair the open circuit in harness between ECM and the mass air flow and intake air temperature sensor connector. |
| 4 CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR. Measure the resistance between ECM and chassis ground. Connector&terminal (B135) No. 26 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 5. | Repair the short circuit to ground in harness between ECM and the mass air flow and intake air temperature sensor connector. |
| 5 CHECK POOR CONTACT. Check for poor contact of ECM and mass air flow and intake air temperature sensor connector. | Is there poor contact of ECM or mass air flow and intake air temperature sensor connector? | Repair the poor contact of ECM or mass air flow and intake air temperature sensor connector. | Replace the mass air flow and intake air temperature sensor. Refer to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, temporary poor contact of connector may be the cause. |
| NOTE |
|---|
| In this case, repair the following item: Open circuit in harness between main relay and mass air flow and intake air temperature sensor connector Poor contact of main relay connector |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK CURRENT DATA. Start the engine. Read the data of airflow sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the voltage 5 V or more? | Go to step 2. | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. |
| 2 CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from the mass air flow and intake air temperature sensor. Start the engine. Read the data of air flow sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the voltage 5 V or more? | Repair the short circuit of harness to power supply between ECM and mass air flow and intake air temperature sensor connector. | Go to step 3. |
| 3 CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Measure the resistance of harness between mass airflow and intake air temperature sensor connector and engine ground. Connector&terminal (B3) No. 4 - Engine ground | Is the resistance less than 5 ohms? | Go to step 4. | Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM and mass air flow and intake air temperature sensor connector Poor contact of ECM connector |
| 4 CHECK POOR CONTACT. Check for poor contact of mass air flow and intake air temperature sensor connector. | Is there poor contact of mass air flow and intake air temperature sensor connector? | Repair the poor contact of mass air flow and intake air temperature sensor connector. | Replace the mass air flow and intake air temperature sensor. Refer to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, temporary poor contact of connector may be the cause. |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, repair the following item: Open circuit in harness between ECM and mass air flow and intake air temperature sensor connector Poor contact of ECM connector |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK CURRENT DATA. Start the engine. Read the data of intake manifold absolute pressure signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the measured value less than 13.3 kPa (100 mmHg, 3.94 inHg)? | Go to step 2. | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. |
| 2 CHECK POWER SUPPLY OF MANIFOLD ABSOLUTE PRESSURE SENSOR. Turn the ignition switch to OFF. Disconnect the connector from manifold absolute pressure sensor. Turn the ignition switch to ON. Measure the voltage between manifold absolute pressure sensor connector and engine ground. Connector&terminal (E21) No. 3 (+) - Engine ground (-) | Is the voltage 4.5 V or more? | Go to step 3. | Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between ECM and manifold absolute pressure sensor connector Poor contact of ECM connector Poor contact of coupling connector |
| 3 CHECK HARNESS BETWEEN ECM AND MANIFOLD ABSOLUTE PRESSURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance of harness between ECM and manifold absolute pressure sensor connector. Connector&terminal (B134) No. 6 - (E21) No. 1 | Is the resistance less than 1 ohms? | Go to step 4. | Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between ECM and manifold absolute pressure sensor connector Poor contact of coupling connector |
| 4 CHECK HARNESS BETWEEN ECM AND MANIFOLD ABSOLUTE PRESSURE SENSOR CONNECTOR. Measure the resistance between ECM and chassis ground. Connector&terminal (B134) No. 6 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 5. | Repair ground short circuit of harness between ECM and manifold absolute pressure sensor connector. |
| 5 CHECK POOR CONTACT. Check for poor contact of ECM and manifold absolute pressure sensor connector. | Is there poor contact of ECM or manifold absolute pressure sensor connector? | Repair the poor contact of ECM or manifold absolute pressure sensor connector. | Replace the manifold absolute pressure sensor. Refer to MANIFOLD ABSOLUTE PRESSURE SENSOR . |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, temporary poor contact of connector may be the cause. |
| NOTE |
|---|
| In this case, repair the following item: Open circuit of harness between ECM and manifold absolute pressure sensor connector Poor contact of ECM connector Poor contact of coupling connector |
| NOTE |
|---|
| In this case, repair the following item: Open circuit of harness between ECM and manifold absolute pressure sensor connector Poor contact of coupling connector |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK CURRENT DATA. Start the engine. Read the data of intake manifold absolute pressure signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the measured value 119.5 kPa (896.5 mmHg, 35.29 inHg) or more? | Go to step 2. | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. |
| 2 CHECK HARNESS BETWEEN ECM AND MANIFOLD ABSOLUTE PRESSURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from manifold absolute pressure sensor. Start the engine. Read the data of intake manifold absolute pressure signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the measured value 119.5 kPa (896.5 mmHg, 35.29 inHg) or more? | Repair the short circuit to power in harness between ECM and manifold absolute pressure sensor connector. | Go to step 3. |
| 3 CHECK HARNESS BETWEEN ECM AND MANIFOLD ABSOLUTE PRESSURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Measure the resistance of harness between manifold absolute pressure sensor connector and engine ground. Connector&terminal (E21) No. 2 - Engine ground | Is the resistance less than 5 ohms? | Go to step 4. | Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between ECM and manifold absolute pressure sensor connector Poor contact of ECM connector Poor contact of coupling connector |
| 4 CHECK POOR CONTACT. Check for poor contact of manifold absolute pressure sensor connector. | Is there poor contact of manifold absolute pressure sensor connector? | Repair the poor contact of manifold absolute pressure sensor connector. | Replace the manifold absolute pressure sensor. Refer to MANIFOLD ABSOLUTE PRESSURE SENSOR . |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, temporary poor contact of connector may be the cause. |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, repair the following item: Open circuit of harness between ECM and manifold absolute pressure sensor connector Poor contact of ECM connector Poor contact of coupling connector |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK ENGINE COOLANT TEMPERATURE. Start the engine and warm up completely. Measure the engine coolant temperature using the Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the engine coolant temperature 75°C (167°F) or higher? | Replace the mass air flow and intake air temperature sensor. Refer to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . | Check DTC P0125 using "List of Diagnostic Trouble Code (DTC)". Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK CURRENT DATA. Start the engine. Read the data of intake air temperature sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the intake air temperature 120°C(248°F) or more? | Go to step 2. | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. |
| 2 CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM and the mass air flow and intake air temperature sensor. Measure the resistance between ECM and chassis ground. Connector&terminal (B135) No. 18 - Chassis ground | Is the resistance 1 Mohms or more? | Replace the mass air flow and intake air temperature sensor. Refer to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . | Repair the short circuit to ground in harness between ECM and the mass air flow and intake air temperature sensor connector. |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, temporary poor contact of connector may be the cause. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK CURRENT DATA. Start the engine. Read the data of intake air temperature sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the intake air temperature less than -40°C (-40°F)? | Go to step 2. | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. |
| 2 CHECK POOR CONTACT. Check for poor contact of ECM and mass air flow and intake air temperature sensor connector. | Is there poor contact of ECM or mass air flow and intake air temperature sensor connector? | Repair the poor contact of ECM or mass air flow and intake air temperature sensor connector. | Go to step 3. |
| 3 CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM and the mass airflow and intake air temperature sensor. Measure the resistance of harness between ECM and the mass air flow and intake air temperature sensor connector. Connector&terminal (B135) No. 18 - (B3) No. 1: (B135) No. 30 - (B3) No. 2 | Is the resistance less than 1 ohms? | Go to step 4. | Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM and mass air flow and intake air temperature sensor connector Poor contact of joint connector |
| 4 CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR. Connect all connectors. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal (B135) No. 18 (+) - Chassis ground (-) | Is the voltage 5 V or more? | Repair the short circuit of harness to power supply between ECM and mass air flow and intake air temperature sensor connector. | Replace the mass air flow and intake air temperature sensor. Refer to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, temporary poor contact of connector may be the cause. |
| NOTE |
|---|
| In this case, repair the following item: Open circuit in harness between ECM and mass air flow and intake air temperature sensor connector Poor contact of joint connector |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK CURRENT DATA. Start the engine. Read the data of engine coolant temperature sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the engine coolant temperature less than -40°C (-40°F)? | Go to step 2. | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. |
| 2 CHECK POOR CONTACT. Check for poor contact of ECM and engine coolant temperature sensor connector. | Is there poor contact of ECM or engine coolant temperature sensor connector? | Repair the poor contact of ECM or engine coolant temperature sensor connector. | Go to step 3. |
| 3 CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and engine coolant temperature sensor. Measure the resistance of harness between ECM and engine coolant temperature sensor connector. Connector&terminal (B134) No. 34 - (E8) No. 2: (B134) No. 29 - (E8) No. 1 | Is the resistance less than 1 ohms? | Go to step 4. | Repair the harness and connector. NOTE: in this case, repair the following item: Open circuit in harness between ECM and engine coolant temperature sensor connector Poor contact of coupling connector |
| 4 CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR. Connect all connectors. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal (B134) No. 34 (+) - Chassis ground (-) | Is the voltage 5 V or more? | Repair the short circuit to power in harness between ECM and engine coolant temperature sensor connector. | Replace the engine coolant temperature sensor. Refer to ENGINE COOLANT TEMPERATURE SENSOR . |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, temporary poor contact of connector may be the cause. |
| NOTE |
|---|
| In this case, repair the following item: Open circuit in harness between ECM and engine coolant temperature sensor connector Poor contact of coupling connector |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Disconnect the connectors from ECM and electronic throttle control. Measure the resistance of harness between ECM and electronic throttle control connector. Connector&terminal (B134) No. 18 - (E57) No. 6: (B134) No. 29 - (EST) No. 3 | Is the resistance less than 1 ohms? | Go to step 2. | Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM and electronic throttle control connector Poor contact of coupling connector |
| 2 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Connect the connector to ECM. Measure the resistance between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 3 - Engine ground | Is the resistance less than 5 ohms? | Go to step 3. | Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between ECM and engine ground Poor contact of ECM connector Poor contact of coupling connector |
| 3 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to ON. Measure the voltage between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 6 (+) - Engine ground (-) | Is the voltage 4.85 V or more? | Repair the short circuit to power in harness between ECM and electronic throttle control connector. | Go to step 4. |
| 4 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between ECM connectors. Connector&terminal (B134) No. 19 - (B134) No. 18 | Is the resistance 1 Mohms or more? | Repair the poor contact of electronic throttle control connector. Replace the electronic throttle control if defective. Refer to THROTTLE BODY . | Repair the short circuit to power in harness between ECM and electronic throttle control connector. |
| NOTE |
|---|
| In this case, repair the following item: Open circuit in harness between ECM and electronic throttle control connector Poor contact of coupling connector |
| NOTE |
|---|
| In this case, repair the following item: Open circuit of harness between ECM and engine ground Poor contact of ECM connector Poor contact of coupling connector |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK ENGINE COOLANT TEMPERATURE SENSOR. Measure the resistance between engine coolant temperature sensor terminals when the engine coolant is cold and after warmed-up. Terminals No. 1 - No. 2 | Is the resistance of engine coolant temperature sensor different between when engine coolant is cold and after warmed-up? | Repair the poor contact of the ECM connector. | Replace the engine coolant temperature sensor. Refer to ENGINE COOLANT TEMPERATURE SENSOR . |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FRONT OXYGEN (A/F) SENSOR CONNECTOR AND COUPLING CONNECTOR. | Has water entered the connector? | Completely remove any water inside. | Go to step 2. |
| 2 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM and front oxygen (A/F) sensor connector. Measure the resistance between ECM and chassis ground. Connector&terminal (B135) No. 9 - Chassis ground: (B135) No. 8 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 3. | Repair the ground short circuit of harness between ECM and front oxygen (A/F) sensor connector. |
| 3 CHECK POOR CONTACT. Check for poor contact of the front oxygen (A/F) sensor connector. | Is there poor contact of front oxygen (A/F) sensor connector? | Repair the poor contact of front oxygen (A/F) sensor connector. | Replace the front oxygen (A/F) sensor. Refer to FRONT OXYGEN (A/F) SENSOR . |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FRONT OXYGEN (A/F) SENSOR CONNECTOR AND COUPLING CONNECTOR. | Has water entered the connector? | Completely remove any water inside. | Go to step 2. |
| 2 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from front oxygen (A/F) sensor. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal (B135) No. 9 (+) - Chassis ground (-): (B135) No. 8 (+) - Chassis ground (-) | Is the voltage 8 V or more? | Repair the short circuit to power in the harness between ECM and front oxygen (A/F) sensor connector. | Replace the front oxygen (A/F) sensor. Refer to FRONT OXYGEN (A/F) SENSOR . |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK EXHAUST SYSTEM. NOTE: Check the following items. Loose installation of front portion of exhaust pipe onto cylinder heads Loose connection between front exhaust pipe and front catalytic converter Damage of exhaust pipe resulting in a hole | Is there any fault in exhaust system? | Repair the exhaust system. | Replace the front oxygen (A/F) sensor. Refer to FRONT OXYGEN (A/F) SENSOR . |
| NOTE |
|---|
| Check the following items. Loose installation of front portion of exhaust pipe onto cylinder heads Loose connection between front exhaust pipe and front catalytic converter Damage of exhaust pipe resulting in a hole |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and front oxygen (A/F) sensor connector. Measure the resistance of harness between ECM and front oxygen (A/F) sensor connector. Connector&terminal (B135) No. 9 - (E22) No. 1: (B135) No. 8 - (E22) No. 3 | Is the resistance less than 1 ohms? | Go to step 2 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and front oxygen (A/F) sensor connector Poor contact of coupling connector |
| 2 CHECK POOR CONTACT. Check for poor contact of ECM and front oxygen (A/F) sensor connector. | Is there poor contact of ECM or front oxygen (A/F) sensor connector? | Repair the poor contact of ECM or front oxygen (A/F) sensor connector. | Replace the front oxygen (A/F) sensor. Refer to FRONT OXYGEN (A/F) SENSOR . |
| NOTE |
|---|
| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK REAR OXYGEN SENSOR DATA. Warm up the engine until engine coolant temperature is higher than 75°C (167°F), and keep the engine speed at 3,000 rpm. (2 minutes maximum) Read the data of rear oxygen sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the voltage 490 mV or more? | Go to step 5 . | Go to step 2 . |
| 2 CHECK REAR OXYGEN SENSOR CONNECTOR AND COUPLING CONNECTOR. | Has water entered the connector? | Completely remove any water inside. | Go to step 3 . |
| 3 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM and rear oxygen sensor. Measure the resistance of harness between ECM and rear oxygen sensor connector. Connector&terminal (B135) No. 4 - (E23) No. 3: (B134) No. 29 - (E23) No. 4 | Is the resistance less than 1 ohms? | Go to step 4 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and rear oxygen sensor connector Poor contact of coupling connector |
| 4 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR. Turn the ignition switch to OFF. Disconnect the connector from rear oxygen sensor. Turn the ignition switch to ON. Measure the voltage between rear oxygen sensor connector and chassis ground. Connector&terminal (E23) No. 3 (+) - Chassis ground (-) | Is the voltage 0.2 - 0.5 V? | Replace the rear oxygen sensor. Refer to REAR OXYGEN SENSOR . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and rear oxygen sensor connector Poor contact of rear oxygen sensor connector Poor contact of ECM connector |
| 5 CHECK EXHAUST SYSTEM. Check exhaust system parts. NOTE: Check the following items. Looseness and improper fitting of exhaust system parts Damage (crack, hole etc.) of parts Loose part and improper installation between front oxygen (A/F) sensor and rear oxygen sensor | Is there any fault in exhaust system? | Repair or replace faulty parts. | Replace the rear oxygen sensor. Refer to REAR OXYGEN SENSOR . |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, repair the following item |
| NOTE |
|---|
| In this case, repair the following item |
| NOTE |
|---|
| Check the following items. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK REAR OXYGEN SENSOR DATA. Warm up the engine until engine coolant temperature is higher than 75°C (167°F), and rapidly reduce the engine speed from 3,000 rpm. Read the data of rear oxygen sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the voltage 250 mV or less? | Go to step 5 . | Go to step 2 . |
| 2 CHECK REAR OXYGEN SENSOR CONNECTOR AND COUPLING CONNECTOR. | Has water entered the connector? | Completely remove any water inside. | Go to step 3 . |
| 3 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM and rear oxygen sensor. Measure the resistance of harness between ECM and rear oxygen sensor connector. Connector&terminal (B135) No. 4 - (E23) No. 3: (B134) No. 29 - (E23) No. 4 | Is the resistance less than 1 ohms? | Go to step 4 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and rear oxygen sensor connector Poor contact of coupling connector |
| 4 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR. Turn the ignition switch to OFF. Disconnect the connector from rear oxygen sensor. Turn the ignition switch to ON. Measure the voltage between rear oxygen sensor connector and chassis ground. Connector&terminal (E23) No. 3 (+) - Chassis ground (-) | Is the voltage 0.2 - 0.5 V? | Replace the rear oxygen sensor. Refer to REAR OXYGEN SENSOR . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and rear oxygen sensor connector Poor contact of rear oxygen sensor connector Poor contact of ECM connector |
| 5 CHECK EXHAUST SYSTEM. Check exhaust system parts. NOTE: Check the following items. Looseness and improper fitting of exhaust system parts Damage (crack, hole etc.) of parts Loose part and improper installation between front oxygen (A/F) sensor and rear oxygen sensor | Is there any fault in exhaust system? | Repair or replace faulty parts. | Replace the rear oxygen sensor. Refer to REAR OXYGEN SENSOR . |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, repair the following item |
| NOTE |
|---|
| In this case, repair the following item |
| NOTE |
|---|
| Check the following items. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM and rear oxygen sensor. Measure the resistance of harness between ECM and rear oxygen sensor connector. Connector&terminal (B135) No. 4 - (E23) No. 3 | Is the resistance less than 1 ohms? | Go to step 2 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and rear oxygen sensor connector Poor contact of coupling connector |
| 2 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR. Measure the resistance between rear oxygen sensor connector and chassis ground. Connector&terminal (E23) No. 3 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 3 . | Repair the ground short circuit of harness between ECM and rear oxygen sensor connector. |
| 3 CHECK REAR OXYGEN SENSOR. Measure the resistance between rear oxygen sensor terminals. Terminals No. 3 - No. 4 | Is the resistance less than 1 ohms? | Replace the rear oxygen sensor. Refer to REAR OXYGEN SENSOR . | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. |
| NOTE |
|---|
| In this case, repair the following item |
| NOTE |
|---|
| In this case, temporary poor contact of connector may be the cause. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK REAR OXYGEN SENSOR DATA. Warm up the engine until engine coolant temperature is higher than 75°C (167°F), and keep the engine speed at 3,000 rpm. (2 minutes maximum) Read the data of rear oxygen sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the voltage 490 mV or more? | Go to step 6 . | Go to step 2 . |
| 2 CHECK REAR OXYGEN SENSOR DATA. Warm up the engine until engine coolant temperature is higher than 75°C (167°F), and rapidly reduce the engine speed from 3,000 rpm. Read the data of rear oxygen sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the voltage 250 mV or less? | Go to step 6 . | Go to step 3 . |
| 3 CHECK REAR OXYGEN SENSOR CONNECTOR AND COUPLING CONNECTOR. | Has water entered the connector? | Completely remove any water inside. | Go to step 4 . |
| 4 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM and rear oxygen sensor. Measure the resistance of harness between ECM and rear oxygen sensor connector. Connector&terminal (B135) No. 4 - (E23) No. 3: (B134) No. 29 - (E23) No. 4 | Is the resistance less than 1 ohms? | Go to step 5 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and rear oxygen sensor connector Poor contact of coupling connector |
| 5 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR. Turn the ignition switch to OFF. Disconnect the connector from rear oxygen sensor. Turn the ignition switch to ON. Measure the voltage between rear oxygen sensor connector and chassis ground. Connector&terminal (E23) No. 3 (+) - Chassis ground (-) | Is the voltage 0.2 - 0.5 V? | Replace the rear oxygen sensor. Refer to REAR OXYGEN SENSOR . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and rear oxygen sensor connector Poor contact of rear oxygen sensor connector Poor contact of ECM connector |
| 6 CHECK EXHAUST SYSTEM. Check exhaust system parts. NOTE: Check the following items. Looseness and improper fitting of exhaust system parts Damage (crack, hole etc.) of parts Loose part and improper installation between front oxygen (A/F) sensor and rear oxygen sensor | Is there any fault in exhaust system? | Repair or replace faulty parts. | Replace the rear oxygen sensor. Refer to REAR OXYGEN SENSOR . |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, repair the following item |
| NOTE |
|---|
| In this case, repair the following item |
| NOTE |
|---|
| Check the following items. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK CURRENT DATA. Start the engine. Read the data of fuel temperature sensor signal using Subaru Select Monitor. NOTE: For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . | Is the temperature 120°C (248°F) or higher? | Go to step 2 . | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. |
| 2 CHECK HARNESS BETWEEN ECM AND FUEL TEMPERATURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and fuel temperature sensor. Measure the resistance between ECM and chassis ground. Connector&terminal (B135) No. 17 - Chassis ground | Is the resistance 1 Mohms or more? | Replace the fuel temperature sensor. Refer to FUEL TEMPERATURE SENSOR . | Repair the ground short circuit of harness between ECM and fuel pump connector. |
| NOTE |
|---|
| For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . |
| NOTE |
|---|
| In this case, temporary poor contact of connector may be the cause. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK CURRENT DATA. Start the engine. Read the data of fuel temperature sensor signal using Subaru Select Monitor. NOTE: For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . | Is the temperature less than -40°C (-40°F)? | Go to step 2 . | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. |
| 2 CHECK POOR CONTACT. Repair any poor contact between the ECM and fuel temperature sensor connectors. | Is there poor contact of the ECM or fuel temperature sensor connectors? | Repair any poor contact between the ECM and fuel temperature sensor connectors. | Go to step 3 . |
| 3 CHECK HARNESS BETWEEN ECM AND FUEL TEMPERATURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and fuel temperature sensor. Measure the resistance of the harness between the ECM and fuel temperature sensor connector. Connector&terminal (B135) No. 17 - (R58) No. 2: (B135) No. 30 - (R58) No. 3 | Is the resistance less than 1 ft? | Go to step 4 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and fuel temperature sensor connector Poor contact of coupling connector Poor contact of joint connector |
| 4 CHECK HARNESS BETWEEN ECM AND FUEL TEMPERATURE SENSOR CONNECTOR. Connect all connectors. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal (B135) No. 17 (+) - Chassis ground (-) | Is the voltage 5 V or more? | Repair the short circuit to power in the harness between the ECM and fuel temperature sensor connector. | Replace the fuel temperature sensor. Refer to FUEL TEMPERATURE SENSOR . |
| NOTE |
|---|
| For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . |
| NOTE |
|---|
| In this case, temporary poor contact of connector may be the cause. |
| NOTE |
|---|
| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK CURRENT DATA. Start the engine. Read the data of the oil temperature sensor signal using the Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the oil temperature 215°C (419°F) or more? | Go to step 2 . | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. |
| 2 CHECK HARNESS BETWEEN ECM AND OIL TEMPERATURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM and oil temperature sensor. Measure the resistance between ECM and chassis ground. Connector&terminal (B134) No. 23 - Chassis ground | Is the resistance 1 Mohms or more? | Replace the oil temperature sensor. Refer to OIL TEMPERATURE SENSOR . | Repair the short circuit to ground in harness between ECM and oil temperature sensor connector. |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, temporary poor contact of connector may be the cause. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK CURRENT DATA. Start the engine. Read the data of the oil temperature sensor signal using the Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the oil temperature less than -40°C (-40°F)? | Go to step 2 . | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. |
| 2 CHECK POOR CONTACT. Check for poor contact of ECM and oil temperature sensor connector. | Is there poor contact of ECM or oil temperature sensor connector? | Repair the poor contact of ECM or the oil temperature sensor connector. | Go to step 3 . |
| 3 CHECK HARNESS BETWEEN ECM AND OIL TEMPERATURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM and oil temperature sensor. Measure the resistance of the harness between ECM and oil temperature sensor connector. Connector&terminal (B134) No. 23 - (E75) No. 2: (B134) No. 29 - (E75) No. 1 | Is the resistance less than 1 ohms? | Go to step 4 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and oil temperature sensor connector Poor contact of coupling connector |
| 4 CHECK HARNESS BETWEEN ECM AND OIL TEMPERATURE SENSOR CONNECTOR. Connect all connectors. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal (B134) No. 23 (+) - Chassis ground (-) | Is the voltage 5 V or more? | Repair the short circuit to power supply in harness between ECM and oil temperature sensor connector. | Replace the oil temperature sensor. Refer to OIL TEMPERATURE SENSOR . |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, temporary poor contact of connector may be the cause. |
| NOTE |
|---|
| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Disconnect the connectors from ECM and electronic throttle control. Measure the resistance between ECM and chassis ground. Connector&terminal (B134) No. 19 - Chassis ground: (B134) No. 28 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 2 . | Repair the short circuit to ground in harness between ECM and electronic throttle control connector. |
| 2 CHECK SHORT CIRCUIT INSIDE THE ECM. Connect the connector to ECM. Measure the resistance between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 4 - Engine ground | Is the resistance 1 Mohms or more? | Replace the electronic throttle control. Refer to THROTTLE BODY . | Repair the short circuit to ground in harness between ECM and electronic throttle control connector. Replace the ECM if defective. Refer to ENGINE CONTROL MODULE (ECM) . |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Disconnect the connectors from ECM and electronic throttle control. Measure the resistance of harness between ECM and electronic throttle control connector. Connector&terminal (B134) No. 28 - (E57) No. 4: (B134) No. 29 - (E57) No. 3 | Is the resistance less than 1 ohms? | Go to step 2 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and electronic throttle control connector Poor contact of coupling connector |
| 2 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Connect the connector to ECM. Measure the resistance between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 3-Engine ground | Is the resistance less than 5 ohms? | Go to step 3 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit of harness between ECM and engine ground Poor contact of ECM connector Poor contact of coupling connector |
| 3 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to ON. Measure the voltage between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 4 (+) - Engine ground (-) | Is the voltage 4.85 V or more? | Repair the short circuit to power in harness between ECM and electronic throttle control connector. | Go to step 4 . |
| 4 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between ECM connectors. Connector&terminal (B134) No. 19 - (B134) No. 28 | Is the resistance 1 Mohms or more? | Repair the poor contact of electronic throttle control connector. Replace the electronic throttle control if defective. Refer to THROTTLE BODY . | Repair the short circuit to power in harness between ECM and electronic throttle control connector. |
| NOTE |
|---|
| In this case, repair the following item |
| NOTE |
|---|
| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK OUTPUT SIGNAL OF ECM. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground on faulty cylinders. Connector&terminal #1 (B137) No. 8 (+) - Chassis ground (-): #2 (B137) No. 9 (+) - Chassis ground (-): #3 (B137) No. 10 (+) - Chassis ground (-): #4 (B137) No. 11 (+) - Chassis ground(-) | Is the voltage 10 V or more? | Go to step 6 . | Go to step 2 . |
| 2 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR. Turn the ignition switch to OFF. Disconnect the connector from fuel injector on faulty cylinders. Measure the resistance between fuel injector connector and engine ground on faulty cylinders. Connector&terminal #1 (E5) No. 1 - Engine ground: #2 (E16) No. 1 - Engine ground: #3 (E6) No. 1 - Engine ground: #4 (E17) No. 1 - Engine ground | Is the resistance 1 Mohms or more? | Go to step 3 . | Repair the short circuit to ground in harness between ECM and fuel injector connector. |
| 3 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR. Measure the resistance of harness between ECM and fuel injector on faulty cylinders. Connector&terminal #1 (B137) No. 8 - (E5) No. 1: #2 (B137) No. 9 - (E16) No. 1: #3 (B137) No. 10 - (E6) No. 1: #4 (B137) No. 11- (E17) No. 1 | Is the resistance less than 1 ohms? | Go to step 4 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and fuel injector connector Poor contact of coupling connector |
| 4 CHECK FUEL INJECTOR. Measure the resistance between fuel injector terminals on faulty cylinder. Terminals No. 1 - No. 2 | Is the resistance 5 - 20 ohms? | Go to step 5 . | Replace the faulty fuel injector. Refer to FUEL INJECTOR . |
| 5 CHECK POWER SUPPLY LINE. Turn the ignition switch to ON. Measure the voltage between fuel injector and engine ground on faulty cylinders. Connector&terminal #1 (E5) No. 2 (+) - Engine ground (-): #2 (E16) No. 2 (+) - Engine ground (-): #3 (E6) No. 2 (+) - Engine ground (-): #4 (E17) No. 2 (+) - Engine ground (-) | Is the voltage 10 V or more? | Repair the poor contact of all connectors in fuel injector circuit. | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between the main relay connector and fuel injector connector on faulty cylinders Poor contact of coupling connector Poor contact of main relay connector |
| 6 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR. Turn the ignition switch to OFF. Disconnect the connector from fuel injector on faulty cylinders. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground on faulty cylinders. Connector&terminal #1 (B137) No. 8 (+) - Chassis ground (-): #2 (B137) No. 9 (+) - Chassis ground (-): #3 (B137) No. 10 (+) - Chassis ground (-): #4 (B137) No. 11 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the short circuit to power in harness between ECM and fuel injector connector. | Go to step 7 . |
| 7 CHECK FUEL INJECTOR. Turn the ignition switch to OFF. Measure the resistance between fuel injector terminals on faulty cylinder. Terminals No. 1 - No. 2 | Is the resistance less than 1 ohms? | Replace the faulty fuel injector. Refer to FUEL INJECTOR . | Go to step 8 . |
| 8 CHECK INSTALLATION CONDITION OF CAMSHAFT POSITION SENSOR/CRANKSHAFT POSITION SENSOR. | Is the camshaft position sensor or crankshaft position sensor loosely installed? | Tighten the camshaft position sensor or crankshaft position sensor. | Go to step 9 . |
| 9 CHECK CRANK SPROCKET. Remove the timing belt cover. Refer to REMOVAL , Timing Belt Cover. | Is the crank sprocket rusted or does it have broken teeth? | Replace the crank sprocket. Refer to CRANK SPROCKET . | Go to step 10 . |
| 10 CHECK INSTALLATION CONDITION OF TIMING BELT. Turn the crankshaft using ST, and align the alignment mark on crank sprocket with alignment mark on cylinder block. ST 499987500 CRANKSHAFT SOCKET | Is the timing belt dislocated from its proper position? | Repair the installation condition of timing belt. Refer to TIMING BELT . | Go to step 11 . |
| 11 CHECK FUEL LEVEL. | Is the fuel meter indication higher than the "Lower" level? | Go to step 12 . | Replenish the fuel so that fuel meter indication is higher than the "Lower" level. After replenishing fuel, Go to step 12. |
| 12 CHECK STATUS OF MALFUNCTION INDICATOR LIGHT. Clear the memory using the Subaru Select Monitor or general scan tool. Refer to CLEAR MEMORY MODE . NOTE: Subaru Select Monitor Refer to SUBARU SELECT MONITOR . General scan tool Refer to the general scan tool operation information. Start the engine, and drive the vehicle 10 minutes or more. | Does the malfunction indicator light illuminate or blink? | Go to step 14 . | Go to step 13 . |
| 13 CHECK CAUSE OF MISFIRE. | Was the cause of misfire identified when the engine is running? | Finish diagnostics operation, if the engine has no abnormality. | Repair the poor contact of connector. NOTE: In this case, repair the following item Poor contact of ignition coil connector Poor contact of fuel injector connector on faulty cylinders Poor contact of ECM connector Poor contact of coupling connector |
| 14 CHECK AIR INTAKE SYSTEM. | Is there any fault in air intake system? | Repair the air intake system. NOTE: Check the following items. Are there air leaks or air suction caused by loose or dislocated nuts and bolts? Are there cracks or any disconnection of hoses? | Go to step 15 . |
| 15 CHECK MISFIRE SYMPTOM. Turn the ignition switch to ON. Read the DTC. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Does the Subaru Select Monitor or general scan tool indicate only one DTC? | Go to step 20 . | Go to step 16 . |
| 16 CHECK DTC. | Are DTC P0301 and P0302 displayed on the Subaru Select Monitor or general scan tool? | Go to step 21 . | Go to step 17 . |
| 17 CHECK DTC. | Are DTC P0303 and P0304 displayed on the Subaru Select Monitor or general scan tool? | Go to step 22 . | Go to step 18 . |
| 18 CHECK DTC. | Are DTC P0301 and P0303 displayed on the Subaru Select Monitor or general scan tool? | Go to step 23 . | Go to step 19 . |
| 19 CHECK DTC. | Are DTC P0302 and P0304 displayed on the Subaru Select Monitor or general scan tool? | Go to step 24 . | Go to step 25 . |
| 20 ONLY ONE CYLINDER. | Is there any fault in the cylinder? | Repair or replace faulty parts. NOTE: Check the following items. Sparkplug Spark plug cord Fuel injector Compression ratio | Go to DTC P0171. Refer to DTC P0171 SYSTEM TOO LEAN (BANK 1) . |
| 21 GROUP OF #1 AND #2 CYLINDERS. | Are there any faults in #1 and #2 cylinders? | Repair or replace faulty parts. NOTE: Check the following items. Sparkplug Fuel injector Ignition coil Compression ratio If any fault are not found, check the "IGNITION CONTROL SYSTEM" of #1 and #2 cylinders side. Refer to IGNITION CONTROL SYSTEM , Diagnostics for Engine Starting Failure. | Go to DTC P0171. Refer to DTC P0171 SYSTEM TOO LEAN (BANK 1) . |
| 22 GROUP OF #3 AND #4 CYLINDERS. | Are there any faults in #3 and #4 cylinders? | Repair or replace faulty parts. NOTE: Check the following items. Sparkplug Fuel injector Ignition coil Compression ratio If any fault are not found, check the "IGNITION CONTROL SYSTEM" of #3 and #4 cylinders side. Refer to IGNITION CONTROL SYSTEM , Diagnostics for Engine Starting Failure. | Go to DTC P0171. Refer to DTC P0171 SYSTEM TOO LEAN (BANK 1) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| 23 GROUP OF #1 AND #3 CYLINDERS. | Are there any faults in #1 and #3 cylinders? | Repair or replace faulty parts. NOTE: Check the following items. Sparkplug Fuel injector Compression ratio Skipping timing belt teeth | Go to DTC P0171. Refer to DTC P0171 SYSTEM TOO LEAN (BANK 1) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| 24 GROUP OF #2 AND #4 CYLINDERS. | Are there any faults in #2 and #4 cylinders? | Repair or replace faulty parts. NOTE: Check the following items. Sparkplug Fuel injector Compression ratio Skipping timing belt teeth | Go to DTC P0171. Refer to DTC P0171 SYSTEM TOO LEAN (BANK 1) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| 25 CYLINDER AT RANDOM. | Is the engine idle rough? | Go to DTC P0171. Refer to DTC P0171 SYSTEM TOO LEAN (BANK 1) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). | Repair or replace faulty parts. NOTE: Check the following items. Sparkplug Fuel injector Compression ratio |
| NOTE |
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| In this case, repair the following item |
| NOTE |
|---|
| In this case, repair the following item |
| NOTE |
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| Subaru Select Monitor Refer to SUBARU SELECT MONITOR . General scan tool Refer to the general scan tool operation information. |
| NOTE |
|---|
| In this case, repair the following item |
| NOTE |
|---|
| Check the following items. |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| Check the following items. |
| NOTE |
|---|
| Check the following items. Sparkplug Fuel injector Ignition coil Compression ratio If any fault are not found, check the "IGNITION CONTROL SYSTEM" of #1 and #2 cylinders side. Refer to IGNITION CONTROL SYSTEM , Diagnostics for Engine Starting Failure. |
| NOTE |
|---|
| Check the following items. Sparkplug Fuel injector Ignition coil Compression ratio If any fault are not found, check the "IGNITION CONTROL SYSTEM" of #3 and #4 cylinders side. Refer to IGNITION CONTROL SYSTEM , Diagnostics for Engine Starting Failure. |
| NOTE |
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| Check the following items. |
| NOTE |
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| Check the following items. |
| NOTE |
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| Check the following items. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND KNOCK SENSOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between ECM connectors. Connector&terminal (B134) No. 15 - (B134) No. 29 | Is the resistance less than 500 kohms? | Go to step 2 . | Go to step 3 . |
| 2 CHECK KNOCK SENSOR. Disconnect the connector from knock sensor. Measure the resistance between knock sensor terminals. Terminals No. 1 - No. 2 | Is the resistance less than 500 kohms? | Replace the knock sensor. Refer to KNOCK SENSOR . | Repair the short circuit to ground in harness between ECM and knock sensor connector. NOTE: The harness between both connectors are shielded. Remove the shield and repair the short circuit of harness. |
| 3 CHECK INPUT SIGNAL OF ECM. Connect the connector to ECM. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal (B134) No. 15 (+) - Chassis ground (-) | Is the voltage 2 V or more? | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. | Repair the poor contact of ECM connector. |
| NOTE |
|---|
| The harness between both connectors are shielded. Remove the shield and repair the short circuit of harness. |
| NOTE |
|---|
| In this case, temporary poor contact of connector may be the cause. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK CONDITION OF CRANKSHAFT POSITION SENSOR. Turn the ignition switch to OFF. | Is the crankshaft position sensor installation bolt tightened securely? | Go to step 2 . | Tighten the crankshaft position sensor installation bolt securely. |
| 2 CHECK CRANK SPROCKET. Remove the timing belt cover. | Are crank sprocket teeth cracked or damaged? | Replace the crank sprocket. Refer to CRANK SPROCKET . | Go to step 3 . |
| 3 CHECK INSTALLATION CONDITION OF TIMING BELT. Turn the crankshaft, and align alignment mark on crank sprocket with alignment mark on cylinder block. | Is the timing belt dislocated from its proper position? | Repair the installation condition of timing belt. Refer to TIMING BELT . | Replace the crankshaft position sensor. Refer to CRANKSHAFT POSITION SENSOR . |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND CAMSHAFT POSITION SENSOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and camshaft position sensor. Measure the resistance of harness between ECM and camshaft position sensor connector. Connector&terminal (B134) No. 12 - (E15) No. 1: (B134) No. 22 - (E15) No. 2 | Is the resistance less than 1 ohms? | Go to step 2 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and camshaft position sensor connector Poor contact of ECM connector Poor contact of coupling connector |
| 2 CHECK HARNESS BETWEEN ECM AND CAMSHAFT POSITION SENSOR. Measure the resistance between camshaft position sensor connector and engine ground. Connector&terminal (E15) No. 1 - Engine ground | Is the resistance 1 Mohms or more? | Go to step 3 . | Repair the short circuit to ground in harness between ECM and camshaft position sensor. NOTE: The harness between both connectors are shielded. Remove the shield and repair the ground short circuit of the harness circuit. |
| 3 CHECK INSTALLATION CONDITION OF CAMSHAFT POSITION SENSOR. | Is the camshaft position sensor installation bolt tightened securely? | Go to step 4 . | Tighten the camshaft position sensor installation bolt securely. |
| 4 CHECK CAMSHAFT POSITION SENSOR. Remove the camshaft position sensor. Measure the resistance between terminals of camshaft position sensor. Terminals No. 1 - No. 2 | Is the resistance between 1 and 4 kohms? | Go to step 5 . | Replace the camshaft position sensor. Refer to CAMSHAFT POSITION SENSOR . |
| 5 CHECK CAM SPROCKET. Remove the timing belt cover. Refer to TIMING BELT COVER . | Are cam sprocket teeth cracked or damaged? | Replace the cam sprocket. Refer to CAM SPROCKET . | Go to step 6 . |
| 6 CHECK INSTALLATION CONDITION OF TIMING BELT. Turn the crankshaft using the ST, and align the alignment mark on the cam sprocket with the alignment mark on the timing belt cover LH. ST 499987500 CRANKSHAFT SOCKET | Is the timing belt dislocated from its proper position? | Repair the installation condition of timing belt. Refer to TIMING BELT . | Replace the camshaft position sensor. Refer to CAMSHAFT POSITION SENSOR . |
| NOTE |
|---|
| In this case, repair the following item |
| NOTE |
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| The harness between both connectors are shielded. Remove the shield and repair the ground short circuit of the harness circuit. |
DIAGNOSTIC PROCEDURE CHART
DIAGNOSTIC PROCEDURE CHART Step Check Yes No 1 CHECK EXHAUST SYSTEM. Check for gas leaks or air suction caused by loose or dislocated nuts and bolts, and open hole at exhaust pipes. NOTE: Check the following positions. Between cylinder head and front exhaust pipe Between front exhaust pipe and front catalytic converter Between front catalytic converter and rear catalytic converter Loose or improperly attached front oxygen (A/F) sensor or rear oxygen sensor Is there any fault in exhaust system? Repair or replace the exhaust system. Refer to GENERAL DESCRIPTION . Go to step 2. 2 CHECK WAVEFORM DATA ON THE SUBARU SELECT MONITOR (WHILE DRIVING). Drive at a constant speed between 80 - 112 km/h (50 - 70 MPH). After 5 minutes have elapsed in the condition of step 1), use the Subaru Select Monitor while still driving to read the waveform data. At normal condition At abnormal condition (numerous inversion) Is a normal waveform displayed? Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. Go to step 3 . 3 CHECK WAVEFORM DATA ON THE SUBARU SELECT MONITOR (WHILE IDLING). Run the engine at idle. in the condition of step 1), use the Subaru Select Monitor to read the waveform data. At normal condition At abnormal condition 1 (numerous inversion) At abnormal condition 2 (noise input) Is a normal waveform displayed? Go to step 4 . The waveform is displayed at abnormal condition 1: Go to step 4 . The waveform is displayed at abnormal condition 2: Go to step 5 . 4 CHECK CATALYTIC CONVERTER. Is the catalytic converter damaged? Replace the catalytic converter. Refer to FRONT CATALYTIC CONVERTER . Go to step 5 . 5 CHECK REAR OXYGEN SENSOR CONNECTOR AND COUPLING CONNECTOR. Has water entered the connector? Completely remove any water inside. Go to step 6 . 6 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM and rear oxygen sensor. Measure the resistance of harness between ECM and rear oxygen sensor connector. Connector&terminal (B135) No. 4 - (E23) No. 3: (B134) No. 29 - (E23) No. 4: Is the resistance less than 1 ohms? Go to step 7 . Repair the harness and connector. NOTE: Repair the following locations. Open circuit in harness between ECM and rear oxygen sensor connector Poor contact of coupling connector 7 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR. Turn the ignition switch to ON. Measure the voltage between rear oxygen sensor connector and chassis ground. Connector&terminal (E23) No. 3 (+) - Chassis ground (-): Is the voltage 0.2 - 0.5 V? Go to step 8 . Repair the harness and connector. NOTE: Repair the following locations. Open circuit in harness between ECM and rear oxygen sensor connector Poor contact of ECM connector Poor contact of coupling connector 8 CHECK REAR OXYGEN SENSOR SHIELD. Turn the ignition switch to OFF. Expose the rear oxygen sensor connector body side harness sensor shield. Measure the resistance between sensor shield and chassis ground. Is the resistance less than 1 ohms? Replace the rear oxygen sensor. Refer to REAR OXYGEN SENSOR . Repair the open circuit of rear oxygen sensor harness
Scheme 141
Scheme 142
Scheme 143
Scheme 144
Scheme 145
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK OUTPUT SIGNAL OF ECM. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal (B136) No. 17 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the poor contact of ECM connector. | Go to step 2 . |
| 2 CHECK HARNESS BETWEEN ECM AND DRAIN VALVE. Turn the ignition switch to OFF. Disconnect the connectors from the ECM and drain valve. Measure the resistance between the drain valve connector and chassis ground. Connector&terminal (R86) No. 2 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 3 . | Repair the ground short circuit of harness between ECM and drain valve connector. |
| 3 CHECK HARNESS BETWEEN ECM AND DRAIN VALVE. Measure the resistance of harness between ECM and drain valve connector. Connector&terminal (B136) No. 17 - (R86) No. 2 | Is the resistance less than 1 ohms? | Go to step 4 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit of harness between ECM and drain valve connector Poor contact of coupling connector |
| 4 CHECK DRAIN VALVE. Measure the resistance between drain valve terminals. Terminals No. 1 - No. 2 | Is the resistance 10 - 100 ohms? | Go to step 5 . | Replace the drain valve. Refer to DRAIN VALVE . |
| 5 CHECK POWER SUPPLY TO DRAIN VALVE. Turn the ignition switch to ON. Measure the voltage between drain valve and chassis ground. Connector&terminal (R86) No. 1 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the poor contact of drain valve connector. | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between main relay connector and drain valve connector Poor contact of coupling connector Poor contact of main relay connector |
| NOTE |
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| In this case, repair the following item |
| NOTE |
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| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND DRAIN VALVE. Turn the ignition switch to OFF. Disconnect the connectors from the ECM and drain valve. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal (B136) No. 17 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the short circuit to power in the harness between ECM and drain valve connector. | Go to step 2 . |
| 2 CHECK DRAIN VALVE. Turn the ignition switch to OFF. Measure the resistance between drain valve terminals. Terminals No. 1 - No. 2 | Is the resistance less than 1 ohms? | Replace the drain valve. Refer to DRAIN VALVE . | Repair the poor contact of ECM connector. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK CURRENT DATA. Turn the ignition switch to ON. Read the data of fuel tank pressure sensor signal using the Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the measured value 7.95 kPa (59.6 mmHg, 2.35 inHg) or more? | Go to step 2 . | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. |
| 2 CHECK HARNESS BETWEEN ECM AND FUEL TANK PRESSURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from the fuel tank pressure sensor. Turn the ignition switch to ON. Read the data of fuel tank pressure sensor signal using the Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the measured value 7.95 kPa (59.6 mmHg, 2.35 inHg) or more? | Repair the short circuit to power in the harness between ECM and fuel tank pressure sensor connector. | Go to step 3 . |
| 3 CHECK HARNESS BETWEEN ECM AND FUEL TANK PRESSURE SENSOR CONNECTOR. Turn the ignition switch to OFF. Measure the resistance of harness between fuel tank pressure sensor connector and engine ground. Connector&terminal (R47) No. 2 - Engine ground | Is the resistance less than 5 ohms? | Go to step 4 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit of harness between ECM and fuel tank pressure sensor connector Poor contact of ECM connector Poor contact of coupling connector |
| 4 CHECK POOR CONTACT. Check for poor contact of the fuel tank pressure sensor connector. | Is there poor contact of fuel tank pressure sensor connector? | Repair the poor contact of fuel tank pressure sensor connector. | Replace the fuel tank pressure sensor. Refer to FUEL TANK PRESSURE SENSOR . |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, temporary poor contact of connector may be the cause. |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FUEL FILLER CAP. Turn the ignition switch to OFF. Check the fuel filler cap. NOTE: The DTC is stored in memory if fuel filler cap is or was loose or if the cap chain has caught while tightening. | Is the fuel filler cap tightened securely? | Go to step 2 . | Tighten fuel filler cap securely. |
| 2 CHECK FUEL FILLER CAP. | Is the fuel filler cap genuine? | Go to step 3 . | Replace with a genuine fuel filler cap. |
| 3 CHECK FUEL FILLER PIPE GASKET. | Is there any damage to the seal between fuel filler cap and fuel filler pipe? | Repair or replace the fuel filler cap and fuel filler pipe. Refer to FUEL FILLER PIPE . | Go to step 4 . |
| 4 CHECK DRAIN VALVE. Connect the delivery (test) mode connector. Turn the ignition switch to ON. Operate the drain valve using the Subaru Select Monitor. NOTE: Drain valve can be operated using the Subaru Select Monitor. For the procedures, see "Compulsory Valve Operation Check Mode". Refer to COMPULSORY VALVE OPERATION CHECK MODE . | Does the drain valve operate? | Go to step 5 . | Replace the drain valve. Refer to DRAIN VALVE . |
| 5 CHECK PURGE CONTROL SOLENOID VALVE. Operate the purge control solenoid valve using the Subaru Select Monitor. NOTE: Purge control solenoid valve operation can be executed using Subaru Select Monitor. For the procedures, see "Compulsory Valve Operation Check Mode". Refer to COMPULSORY VALVE OPERATION CHECK MODE . | Does the purge control solenoid valve operate? | Go to step 6 . | Replace the purge control solenoid valve. Refer to PURGE CONTROL SOLENOID VALVE . |
| 6 CHECK PRESSURE CONTROL SOLENOID VALVE. Operate the pressure control solenoid valve using the Subaru Select Monitor. NOTE: The pressure control solenoid valve operation can be executed using the Subaru Select Monitor. For the procedures, see "Compulsory Valve Operation Check Mode". Refer to COMPULSORY VALVE OPERATION CHECK MODE . | Does the pressure control solenoid valve operate? | Go to step 7 . | Replace the pressure control solenoid valve. Refer to PRESSURE CONTROL SOLENOID VALVE . |
| 7 CHECK EVAPORATIVE EMISSION CONTROL SYSTEM LINE. Turn the ignition switch to OFF. Disconnect the delivery (test) mode connector. | Is there any hole of more than 0.5 mm (0.020 in) dia. on evaporation line? | Repair or replace the evaporation line. Refer to FUEL DELIVERY AND EVAPORATION LINES . | Go to step 8 . |
| 8 CHECK CANISTER. | Is the canister damaged or is there a hole of more than 0.5 mm (0.020 in) dia. in it? | Repair or replace the canister. Refer to CANISTER . | Go to step 9 . |
| 9 CHECK FUEL TANK. Remove the fuel tank. Refer to FUEL TANK . | Is the fuel tank damaged or is there any hole of more than 0.5 mm (0.020 in) dia. in it? | Repair or replace the fuel tank. Refer to FUEL TANK . | Go to step 10 . |
| 10 CHECK ANY OTHER MECHANICAL TROUBLE IN EVAPORATIVE EMISSION CONTROL SYSTEM. | Is there any hole of more than 0.5 mm (0.020 in) dia. crack, clogging, or disconnections, bend, misconnection of hoses or pipes in evaporative emission control system? | Repair or replace the hoses or pipes. | Repair the poor contact of ECM connector. |
| NOTE |
|---|
| The DTC is stored in memory if fuel filler cap is or was loose or if the cap chain has caught while tightening. |
| NOTE |
|---|
| Drain valve can be operated using the Subaru Select Monitor. For the procedures, see "Compulsory Valve Operation Check Mode". Refer to COMPULSORY VALVE OPERATION CHECK MODE . |
| NOTE |
|---|
| Purge control solenoid valve operation can be executed using Subaru Select Monitor. For the procedures, see "Compulsory Valve Operation Check Mode". Refer to COMPULSORY VALVE OPERATION CHECK MODE . |
| NOTE |
|---|
| The pressure control solenoid valve operation can be executed using the Subaru Select Monitor. For the procedures, see "Compulsory Valve Operation Check Mode". Refer to COMPULSORY VALVE OPERATION CHECK MODE . |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FUEL FILLER CAP. Turn the ignition switch to OFF. Check the fuel filler cap. NOTE: The DTC is stored in memory if fuel filler cap is or was loose or if the cap chain has caught while tightening. | Is the fuel filler cap tightened securely? | Go to step 2 . | Tighten fuel filler cap securely. |
| 2 CHECK FUEL FILLER CAP. | Is the fuel filler cap genuine? | Go to step 3 . | Replace with a genuine fuel filler cap. |
| 3 CHECK FUEL FILLER PIPE GASKET. | Is there any damage to the seal between fuel filler cap and fuel filler pipe? | Repair or replace the fuel filler cap and fuel filler pipe. Refer to FUEL FILLER PIPE . | Go to step 4 . |
| 4 CHECK DRAIN VALVE. Connect the delivery (test) mode connector. Turn the ignition switch to ON. Operate the drain valve using the Subaru Select Monitor. NOTE: Drain valve can be operated using the Subaru Select Monitor. For the procedures, see "Compulsory Valve Operation Check Mode". Refer to COMPULSORY VALVE OPERATION CHECK MODE . | Does the drain valve operate? | Go to step 5 . | Replace the drain valve. Refer to DRAIN VALVE . |
| 5 CHECK PURGE CONTROL SOLENOID VALVE. Operate the purge control solenoid valve using the Subaru Select Monitor. NOTE: Purge control solenoid valve operation can be executed using Subaru Select Monitor. For the procedures, see "Compulsory Valve Operation Check Mode". Refer to COMPULSORY VALVE OPERATION CHECK MODE . | Does the purge control solenoid valve operate? | Go to step 6 . | Replace the purge control solenoid valve. Refer to PURGE CONTROL SOLENOID VALVE . |
| 6 CHECK PRESSURE CONTROL SOLENOID VALVE. Operate the pressure control solenoid valve using the Subaru Select Monitor. NOTE: The pressure control solenoid valve operation can be executed using the Subaru Select Monitor. For the procedures, see "Compulsory Valve Operation Check Mode". Refer to COMPULSORY VALVE OPERATION CHECK MODE . | Does the pressure control solenoid valve operate? | Go to step 7 . | Replace the pressure control solenoid valve. Refer to PRESSURE CONTROL SOLENOID VALVE . |
| 7 CHECK EVAPORATIVE EMISSION CONTROL SYSTEM LINE. Turn the ignition switch to OFF. Disconnect the delivery (test) mode connector. | Is there any disconnection, damage or clogging on the evaporation line? | Repair or replace the evaporation line. Refer to FUEL DELIVERY AND EVAPORATION LINES . | Go to step 8 . |
| 8 CHECK CANISTER. | Is the canister damaged? | Repair or replace the canister. Refer to CANISTER . | Go to step 9 . |
| 9 CHECK FUEL TANK. Remove the fuel tank. Refer to FUEL TANK . | Is the fuel tank damaged? | Repair or replace the fuel tank. Refer to FUEL TANK . | Go to step 10 . |
| 10 CHECK ANY OTHER MECHANICAL TROUBLE IN EVAPORATIVE EMISSION CONTROL SYSTEM. | Are there holes, cracks, clogging, or disconnections, mis-connection of hoses or pipes in evaporative emission control system? | Repair or replace the hoses or pipes. | Repair the poor contact of ECM connector. |
| NOTE |
|---|
| The DTC is stored in memory if fuel filler cap is or was loose or if the cap chain has caught while tightening. |
| NOTE |
|---|
| Drain valve can be operated using the Subaru Select Monitor. For the procedures, see "Compulsory Valve Operation Check Mode". Refer to COMPULSORY VALVE OPERATION CHECK MODE . |
| NOTE |
|---|
| Purge control solenoid valve operation can be executed using Subaru Select Monitor. For the procedures, see "Compulsory Valve Operation Check Mode". Refer to COMPULSORY VALVE OPERATION CHECK MODE . |
| NOTE |
|---|
| The pressure control solenoid valve operation can be executed using the Subaru Select Monitor. For the procedures, see "Compulsory Valve Operation Check Mode". Refer to COMPULSORY VALVE OPERATION CHECK MODE . |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK OUTPUT SIGNAL OF ECM. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal (B137) No. 29 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the poor contact of ECM connector. | Go to step 2 . |
| 2 CHECK HARNESS BETWEEN ECM AND PURGE CONTROL SOLENOID VALVE. Turn the ignition switch to OFF. Disconnect the connectors from ECM and purge control solenoid valve. Measure the resistance between the purge control solenoid valve connector and engine ground. Connector&terminal (E4) No. 1 - Engine ground | Is the resistance 1 Mohms or more? | Go to step 3 . | Repair the ground short circuit of harness between ECM and purge control solenoid valve connector. |
| 3 CHECK HARNESS BETWEEN ECM AND PURGE CONTROL SOLENOID VALVE. Measure the resistance of harness between ECM and purge control solenoid valve. Connector&terminal (B137) No. 29 - (E4) No. 1 | Is the resistance less than 1 ohms? | Go to step 4 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and purge control solenoid valve connector Poor contact of coupling connector |
| 4 CHECK PURGE CONTROL SOLENOID VALVE. Remove the purge control solenoid valve. Measure the resistance between purge control solenoid valve terminals. Terminals No. 1 - No. 2 | Is the resistance 10 - 100 ohms? | Go to step 5 . | Replace the purge control solenoid valve. Refer to PURGE CONTROL SOLENOID VALVE . |
| 5 CHECK POWER SUPPLY TO PURGE CONTROL SOLENOID VALVE. Turn the ignition switch to ON. Measure the voltage between purge control solenoid valve and engine ground. Connector&terminal (E4) No. 2 (+) - Engine ground (-) | Is the voltage 10 V or more? | Repair the poor contact of purge control solenoid valve connector. | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between main relay and purge control solenoid valve connector Poor contact of coupling connector Poor contact of main relay connector |
| NOTE |
|---|
| In this case, repair the following item |
| NOTE |
|---|
| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND PURGE CONTROL SOLENOID VALVE. Turn the ignition switch to OFF. Disconnect the connectors from ECM and purge control solenoid valve. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal (B137) No. 29 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the short circuit to power in the harness between ECM and purge control solenoid valve connector. | Go to step 2 . |
| 2 CHECK PURGE CONTROL SOLENOID VALVE. Turn the ignition switch to OFF. Measure the resistance between purge control solenoid valve terminals. Terminals No. 1 - No. 2 | Is the resistance less than 1 ohms? | Replace the purge control solenoid valve. Refer to PURGE CONTROL SOLENOID VALVE . | Repair the poor contact of ECM connector. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FOR ANY OTHER DTC ON DISPLAY. | Is any other DTC displayed? | Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . | Go to step 2 . |
| 2 CHECK AIR CLEANER ELEMENT. Turn the ignition switch to OFF. Check the air cleaner element. | Is there excessive clogging on air cleaner element? | Replace the air cleaner element. Refer to AIR CLEANER ELEMENT | Go to step 3 . |
| 3 CHECK ELECTRONIC THROTTLE CONTROL. Remove the electronic throttle control. Check the electronic throttle control. | Are foreign matter found inside electronic throttle control? | Remove foreign matter from electronic throttle control. | Perform the diagnosis of DTC P2101. Refer to DTC P2101 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FOR ANY OTHER DTC ON DISPLAY. | Is any other DTC displayed? | Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . | Go to step 2 . |
| 2 CHECK AIR INTAKE SYSTEM. Start and idle the engine. Check the following items. Loose installation of intake manifold and throttle body Cracks of intake manifold gasket and throttle body gasket Disconnection of vacuum hoses | Is there any fault in air intake system? | Repair air suction and leaks. | Go to step 3 . |
| 3 CHECK ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Remove the electronic throttle control. Check the electronic throttle control. | Are foreign matter found inside electronic throttle control? | Remove foreign matter from electronic throttle control. | Perform the diagnosis of DTC P2101.Referto DTC P2101 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FOR ANY OTHER DTC ON DISPLAY. | Is any other DTC displayed? | Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . | Go to step 2 . |
| 2 CHECK HARNESS BETWEEN ECM AND IGNITION SWITCH. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal (B136) No. 32 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the short circuit to power in harness between ECM and ignition switch connector. | Repair the poor contact of ECM connector. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FOR ANY OTHER DTC ON DISPLAY. | Is any other DTC displayed? | Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector may be the cause. |
| NOTE |
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| In this case, temporary poor contact of connector may be the cause. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK INPUT SIGNAL OF ECM. Turn the ignition switch to ON. Place the shift lever in a position other than neutral. Measure the voltage between ECM and chassis ground. Connector&terminal (B136) No. 31 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the poor contact of ECM connector. | Go to step 2 . |
| 2 CHECK HARNESS BETWEEN ECM AND NEUTRAL POSITION SWITCH CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and neutral position switch. Measure the resistance between ECM and chassis ground. Connector&terminal (B136) No. 31 - Chassis ground | Is the resistance 1 Mohms or more? | Repair the short circuit of transmission harness, or replace the neutral position switch. Refer to SWITCHES AND HARNESS . | Repair the short circuit to ground harness between ECM and neutral position switch connector. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK SELECT CABLE. | Is there any fault in select cable? | Repair or adjust the select cable. Refer to SELECT CABLE . | Go to step 2 . |
| 2 CHECK INPUT SIGNAL OF ECM. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground with select lever at "P" range and "N" range. Connector&terminal (B136) No. 31 (+) - Chassis ground (-) | Is the voltage less than 1 V? | Repair the poor contact of ECM connector. | Go to step 3 . |
| 3 CHECK HARNESS BETWEEN ECM AND INHIBITOR SWITCH CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and inhibitor switch. Measure the resistance of harness between ECM and inhibitor switch connector. Connector&terminal (B136) No. 31 - (T7) No. 6 | Is the resistance less than 1 ohms? | Go to step 4 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and inhibitor switch connector Poor contact of coupling connector |
| 4 CHECK INHIBITOR SWITCH GROUND LINE. Measure the resistance of harness between inhibitor switch connector and engine ground. Connector&terminal (T7) No. 9-Engine ground | Is the resistance less than 5 ohms? | Replace the inhibitor switch. Refer to INHIBITOR SWITCH . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit of harness between inhibitor switch connector and starter motor ground line Poor contact of coupling connector Poor contact of starter motor connector Poor contact of starter motor ground Starter motor |
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| In this case, repair the following item |
| NOTE |
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| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK INPUT SIGNAL OF ECM. Turn the ignition switch to ON. Place the shift lever in neutral. Measure the voltage between ECM and chassis ground. Connector&terminal (B136) No. 31 (+) - Chassis ground (-) | Is the voltage less than 1 V? | Repair the poor contact of ECM connector. | Go to step 2 . |
| 2 CHECK HARNESS BETWEEN ECM AND NEUTRAL POSITION SWITCH CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and neutral position switch. Measure the resistance of harness between ECM and neutral position switch connector. Connector&terminal (B136) No. 31 - (T2) No. 2 | Is the resistance less than 1 ohms? | Go to step 3 . | Repair the open circuit in harness between ECM and transmission harness connector. |
| 3 CHECK HARNESS BETWEEN ECM AND NEUTRAL POSITION SWITCH CONNECTOR. Measure the resistance of harness between ECM and transmission harness connector. Connector&terminal (B136) No. 6 - (T2) No. 1 | Is the resistance less than 5 ohms? | Go to step 4 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and neutral position switch connector Poor contact of coupling connector |
| 4 CHECK NEUTRAL POSITION SWITCH. Place the shift lever in neutral. Measure the resistance between neutral position switch terminals. Terminals No. 1 - No. 2 | Is the resistance less than 1 ohms? | Repair the poor contact of transmission harness connector. | Repair the open circuit of transmission harness, or replace the neutral position switch. Refer to SWITCHES AND HARNESS . |
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| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FRONT OXYGEN (A/F) SENSOR CONNECTOR AND COUPLING CONNECTOR. | Has water entered the connector? | Completely remove any water inside. | Go to step 2 . |
| 2 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and front oxygen (A/F) sensor. Measure the resistance of harness between ECM and front oxygen (A/F) sensor connector. Connector&terminal (B135) No. 9 - (E22) No. 1: (B135) No. 8 - (E22) No. 3 | Is the resistance less than 1 ohms? | Go to step 3 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and front oxygen (A/F) sensor connector Poor contact of coupling connector |
| 3 CHECK POOR CONTACT. Check for poor contact of the front oxygen (A/F) sensor connector. | Is there poor contact of front oxygen (A/F) sensor connector? | Repair the poor contact of front oxygen (A/F) sensor connector. | Replace the front oxygen (A/F) sensor. Refer to FRONT OXYGEN (A/F) SENSOR . |
| NOTE |
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| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FRONT OXYGEN (A/F) SENSOR CONNECTOR AND COUPLING CONNECTOR. | Has water entered the connector? | Completely remove any water inside. | Go to step 2 . |
| 2 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between ECM and chassis ground. Connector&terminal (B135) No. 9 - Chassis ground: (B135) No. 8 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 3 . | Repair the ground short circuit of harness between ECM and front oxygen (A/F) sensor connector. |
| 3 CHECK OUTPUT SIGNAL FOR ECM. Connect the connector to ECM. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal (B135) No. 9 (+) - Chassis ground (-) | Is the voltage 4.5 V or more? | Go to step 5 . | Go to step 4 . |
| 4 CHECK OUTPUT SIGNAL FOR ECM. Measure the voltage between ECM and chassis ground. Connector&terminal (B135) No. 8 (+) - Chassis ground (-) | Is the voltage 4.95 V or more? | Go to step 5 . | Replace the front oxygen (A/F) sensor. Refer to FRONT OXYGEN (A/F) SENSOR . |
| 5 CHECK OUTPUT SIGNAL FOR ECM. Measure the voltage between ECM and chassis ground. Connector&terminal (B135) No. 9 (+) - Chassis ground (-): (B135) No. 8 (+) - Chassis ground (-) | Is the voltage 8 V or more? | Repair the short circuit to power in the harness between ECM and front oxygen (A/F) sensor connector. After repair, replace the ECM. Refer to ENGINE CONTROL MODULE (ECM) . | Repair the poor contact of ECM connector. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK OUTPUT SIGNAL OF ECM. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal (B136) No. 28 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the poor contact of ECM connector. | Go to step 2 . |
| 2 CHECK HARNESS BETWEEN ECM AND PRESSURE CONTROL SOLENOID VALVE. Turn the ignition switch to OFF. Disconnect the connector from the ECM and pressure control solenoid valve. Measure the resistance between pressure control solenoid valve and chassis ground. Connector&terminal (R68) No. 2 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 3 . | Repair the ground short circuit of harness between ECM and pressure control solenoid valve connector. |
| 3 CHECK HARNESS BETWEEN ECM AND PRESSURE CONTROL SOLENOID VALVE. Measure the resistance of harness between ECM and pressure control solenoid valve connector. Connector&terminal (B136) No. 28 - (R68) No. 2 | Is the resistance less than 1 ohms? | Go to step 4 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and pressure control solenoid valve connector Poor contact of coupling connector |
| 4 CHECK PRESSURE CONTROL SOLENOID VALVE. Measure the resistance between pressure control solenoid valve terminals. Terminals No. 1 - No. 2 | Is the resistance 10 - 100 ohms? | Go to step 5 . | Replace the pressure control solenoid valve. Refer to PRESSURE CONTROL SOLENOID VALVE . |
| 5 CHECK POWER SUPPLY TO THE PRESSURE CONTROL SOLENOID VALVE. Turn the ignition switch to ON. Measure the voltage between pressure control solenoid valve and chassis ground. Connector&terminal (R68) No. 1 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the poor contact of pressure control solenoid valve connector. | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between main relay and pressure control solenoid valve connector Poor contact of coupling connector Poor contact of main relay connector |
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| In this case, repair the following item |
| NOTE |
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| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND PRESSURE CONTROL SOLENOID VALVE. Turn the ignition switch to OFF. Disconnect the connector from the ECM and pressure control solenoid valve. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal (B136) No. 28 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the short circuit to power in the harness between ECM and pressure control solenoid valve connector. | Go to step 2 . |
| 2 CHECK PRESSURE CONTROL SOLENOID VALVE. Turn the ignition switch to OFF. Measure the resistance between pressure control solenoid valve terminals. Terminals No. 1 - No. 2 | Is the resistance less than 1 ohms? | Replace the pressure control solenoid valve. Refer to PRESSURE CONTROL SOLENOID VALVE . | Repair the poor contact of ECM connector. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FOR ANY OTHER DTC ON DISPLAY. | Is any other DTC displayed? | Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . | Go to step 2 . |
| 2 CHECK DRAIN HOSE. Check the drain hose for clogging. | Is there clogging in the drain hose? | Replace the drain hose. | Go to step 3 . |
| 3 CHECK DRAIN VALVE OPERATION. Turn the ignition switch to OFF. Connect the delivery (test) mode connector at the lower portion of instrument panel (on the driver's side). Turn the ignition switch to ON. Operate the drain valve. NOTE: Drain valve can be operated using the Subaru Select Monitor. For the procedures, see "Compulsory Valve Operation Check Mode". Refer to COMPULSORY VALVE OPERATION CHECK MODE . | Does the drain valve operate? | Repair the poor contact of ECM connector. | Replace the drain valve. Refer to DRAIN VALVE . |
| NOTE |
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| Drain valve can be operated using the Subaru Select Monitor. For the procedures, see "Compulsory Valve Operation Check Mode". Refer to COMPULSORY VALVE OPERATION CHECK MODE . |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK POWER SUPPLY TO EGR VALVE. Turn the ignition switch to OFF. Disconnect the connector from EGR valve. Turn the ignition switch to ON. Measure the voltage between EGR valve connector and engine ground. Connector&terminal (E18) No. 2 (+) - Engine ground (-): (E18) No. 5 (+) - Engine ground (-) | Is the voltage 10 V or more? | Go to step 2 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between EGR valve and main relay connector Poor contact of coupling connector |
| 2 CHECK HARNESS BETWEEN ECM AND EGR VALVE CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between ECM and EGR valve connector. Connector&terminal DTC P1492; (B134) No. 8 - (E18) No. 3: DTC P1494; (B134) No. 9 - (E18) No. 1: DTC P1496; (B134) No. 10 - (E18) No. 4: DTC P1498; (B134) No. 20 - (E18) No. 6 | Is the resistance less than 1 ohms? | Go to step 3 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and EGR valve connector Poor contact of coupling connector |
| 3 CHECK HARNESS BETWEEN ECM AND EGR VALVE CONNECTOR. Disconnect the connectors from ECM. Measure the resistance between ECM and chassis ground. Connector&terminal DTC P1492; (B134) No. 8 - Chassis ground: DTC P1494; (B134) No. 9 - Chassis ground: DTC P1496; (B134) No. 10 - Chassis ground: DTC P1498; (B134) No. 20 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 4 . | Repair the ground short in harness between ECM and EGR valve connector. |
| 4 CHECK POOR CONTACT. Check poor contact of ECM and EGR valve connector. | Is there poor contact of ECM or EGR valve connector? | Repair the poor contact of ECM or EGR valve connector. | Replace the EGR valve. Refer to EGR VALVE . |
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| In this case, repair the following item |
| NOTE |
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| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND EGR VALVE CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from EGR valve. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal DTC P1493; (B134) No. 8 (+) - Chassis ground (-): DTC P1495; (B134) No. 9 (+) - Chassis ground (-): DTC P1497; (B134) No. 10 (+) - Chassis ground (-): DTC P1499; (B134) No. 20 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the short circuit to power supply in harness between ECM and EGR valve connector. | Repair the poor contact of ECM connector. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK INPUT SIGNAL OF ECM. Turn the ignition switch to OFF. Measure the voltage between ECM and chassis ground. Connector&terminal (B135) No. 5 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the poor contact of ECM connector. | Go to step 2 . |
| 2 CHECK HARNESS BETWEEN ECM AND MAIN FUSE BOX CONNECTOR. Disconnect the connectors from ECM. Measure the resistance between ECM and chassis ground. Connector&terminal (B135) No. S - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 3 . | Repair the ground short circuit of harness between ECM and battery terminal. |
| 3 CHECK FUSE NO. 13 (MAIN FUSE BOX). | Is the fuse blown out? | Replace the fuse. | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and battery Poor contact of ECM connector Poor contact of battery terminal |
| NOTE |
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| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FOR ANY OTHER DTC ON DISPLAY. | Is any other DTC displayed? | Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . | Go to step 2 . |
| 2 CHECK ENGINE OIL. | Is there a proper amount of engine oil? | Go to step 3 . | Replace engine oil. Refer to REPLACEMENT , Engine Oil. |
| 3 CHECK EXHAUST SYSTEM. | Are there holes or loose bolts on exhaust system? | Repair the exhaust system. | Go to step 4 . |
| 4 CHECK AIR INTAKE SYSTEM. | Are there holes, loose bolts or disconnection of hose on air intake system? | Repair the air intake system. | Go to step 5 . |
| 5 CHECK FUEL PRESSURE. WARNING: Place "NO OPEN FLAMES" signs near the working area. CAUTION: Be careful not to spill fuel. Measure the fuel pressure. Refer to INSPECTION , Fuel Pressure. CAUTION: Release fuel pressure before removing the fuel pressure gauge. | Is the measured value 339.5 - 360.5 kPa (3.5 - 3.7 kg/cm 2 , 49 -52 psi)? | Go to step 6 . | Repair the following item. Fuel pressure is too high: Clogged fuel line or bent hose Fuel pressure is too low: Improper fuel pump discharge Clogged fuel line |
| 6 CHECK ENGINE COOLANT TEMPERATURE SENSOR. Start the engine and warm up completely. Read the data of engine coolant temperature sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the engine coolant temperature 75°C (167°F) or higher? | Go to step 7 . | Replace the engine coolant temperature sensor. Refer to ENGINE COOLANT TEMPERATURE SENSOR . |
| 7 CHECK MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR. Start the engine and warm up engine until coolant temperature is higher than 75°C (167°F). For AT models, set the select lever to "P" range or "N" range, and for MT models, place the shift lever in the neutral position. Turn the A/C switch to OFF. Turn all the accessory switches to OFF. Read the data of the mass air flow and intake air temperature sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the measured value 2.0 - 5.0 g/s (0.26 - 0.66 lb/m)? | Go to step 8 . | Replace the mass air flow and intake air temperature sensor. Refer to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . |
| 8 CHECK MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR. Start the engine and warm up engine until coolant temperature is higher than 75°C (167°F). For AT models, set the select lever to "P" range or "N" range, and for MT models, place the shift lever in the neutral position. Turn the A/C switch to OFF. Turn all the accessory switches to OFF. Open the front hood. Measure the ambient temperature. Read the data of the mass air flow and intake air temperature sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Subtract ambient temperature from intake air temperature. Is the obtained value -10-50°C (-18 -90°F)? | Go to step 9 . | Check the mass air flow and intake air temperature sensor. Refer to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . |
| 9 CHECK OUTPUT SIGNAL OF ECM. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground on faulty cylinders. Connector&terminal #1 (B137) No. 8 (+) - Chassis ground (-): #2 (B137) No. 9 (+) - Chassis ground (-): #3 (B137) No. 10 (+) - Chassis ground (-): #4 (B137) No. 11 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Go to step 14 . | Go to step 10 . |
| 10 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR. Turn the ignition switch to OFF. Disconnect the connector from fuel injector on faulty cylinders. Measure the resistance between fuel injector connector and engine ground on faulty cylinders. Connector&terminal #1 (E5) No. 1 - Engine ground: #2 (E16) No. 1 - Engine ground: #3 (E6) No. 1 - Engine ground: #4 (E17) No. 1 - Engine ground | Is the resistance 1 Mohms or more? | Go to step 11 . | Repair the short circuit to ground in harness between ECM and fuel injector connector. |
| 11 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR. Measure the resistance of harness between ECM and fuel injector on faulty cylinders. Connector&terminal #1 (B137) No. 8 - (E5) No. 1: #2 (B137) No. 9 - (E16) No. 1: #3 (B137) No. 10 - (E6) No. 1: #4 (B137) No. 11 - (E17) No. 1 | Is the resistance less than 1 ohms? | Go to step 12 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and fuel injector connector Poor contact of coupling connector |
| 12 CHECK FUEL INJECTOR. Measure the resistance between fuel injector terminals on faulty cylinder. Terminals No. 1 - No. 2 | Is the resistance 5 - 20 ohms? | Go to step 13 . | Replace the faulty fuel injector. Refer to FUEL INJECTOR . |
| 13 CHECK POWER SUPPLY LINE. Turn the ignition switch to ON. Measure the voltage between fuel injector and engine ground on faulty cylinders. Connector&terminal #1 (E5) No. 2 (+) - Engine ground (-): #2 (E16) No. 2 (+) - Engine ground (-): #3 (E6) No. 2 (+) - Engine ground (-): #4 (E17) No. 2 (+) - Engine ground (-) | Is the voltage 10 V or more? | Repair the poor contact of all connectors in fuel injector circuit. | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between the main relay connector and fuel injector connector on faulty cylinders Poor contact of coupling connector Poor contact of main relay connector |
| 14 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR. Turn the ignition switch to OFF. Disconnect the connector from fuel injector on faulty cylinders. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground on faulty cylinders. Connector&terminal #1 (B137) No. 8 (+) - Chassis ground (-): #2 (B137) No. 9 (+) - Chassis ground (-): #3 (B137) No. 10 (+) - Chassis ground(-): #4 (B137) No. 11 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the short circuit to power in the harness between the ECM and fuel injector. | Go to step 15 . |
| 15 CHECK FUEL INJECTOR. Turn the ignition switch to OFF. Measure the resistance between fuel injector terminals on faulty cylinder. Terminals No. 1 - No. 2 | Is the resistance less than 1 ohms? | Replace the faulty fuel injector. Refer to FUEL INJECTOR . | Go to step 16 . |
| 16 CHECK INSTALLATION CONDITION OF CAMSHAFT POSITION SENSOR/CRANKSHAFT POSITION SENSOR. | Is the camshaft position sensor or crankshaft position sensor loosely installed? | Tighten the camshaft position sensor or crankshaft position sensor. Refer to INSTALLATION , Camshaft Position Sensor. Refer to INSTALLATION , Crankshaft Position Sensor. | Go to step 17 . |
| 17 CHECK CRANK SPROCKET. Remove the timing belt cover. Refer to REMOVAL , Timing Belt Cover. | Is the crank sprocket rusted or does it have broken teeth? | Replace the crank sprocket. Refer to CRANK SPROCKET . | Go to step 18 . |
| 18 CHECK INSTALLATION CONDITION OF TIMING BELT. Turn the crankshaft using ST, and align the alignment mark on crank sprocket with alignment mark on cylinder block. ST 499987500 CRANKSHAFT SOCKET | Is the timing belt dislocated from its proper position? | Repair the installation condition of timing belt. Refer to TIMING BELT . | Go to step 19 . |
| 19 CHECK ELECTRONIC THROTTLE CONTROL RELAY. Turn the ignition switch to OFF. Remove the electronic throttle control relay. Connect the battery to terminals No. 31 and No. 32 of electronic throttle control relay. Measure the resistance between electronic throttle control relay terminals. Terminals No. 29 - No. 30 | Is the resistance less than 1 ohms? | Go to step 20 . | Replace the electronic throttle control relay. Refer to ELECTRONIC THROTTLE CONTROL RELAY . |
| 20 CHECK POWER SUPPLY OF ELECTRONIC THROTTLE CONTROL RELAY. Measure the voltage between electronic throttle control relay connector and chassis ground. Connector&terminal (B220) No. 29 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Go to step 21 . | Repair the open or ground short circuit of power supply circuit. |
| 21 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. Disconnect the connectors from ECM. Turn the ignition switch to ON. Measure the voltage between electronic throttle control relay connector and chassis ground. Connector&terminal (B220) No. 32 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the short circuit to power in the harness between ECM and electronic throttle control relay connector. | Go to step 22 . |
| 22 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. Turn the ignition switch to OFF. Measure the resistance between electronic throttle control relay connector and chassis ground. Connector&terminal (B220) No. 32 - Chassis ground: (B220) No. 30 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 23 . | Repair the short circuit in harness to ground between ECM and electronic throttle control relay connector. |
| 23 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. Measure the resistance between ECM and electronic throttle control relay connector. Connector&terminal (B136) No. 21 - (B220) No. 32: (B136) No. 1 - (B220) No. 30 | Is the resistance less than 1 ohms? | Go to step 24 . | Repair the open circuit in harness between ECM and electronic throttle control relay connector. |
| 24 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Disconnect the connectors from ECM and electronic throttle control. Measure the resistance between ECM and chassis ground. Connector&terminal (B134) No. 19 - Chassis ground: (B134) No. 18 - Chassis ground: (B134) No. 18 - (B136) No. 6: (B134) No. 28 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 25 . | Repair the short circuit to ground in harness between ECM and electronic throttle control connector. |
| 25 CHECK SHORT CIRCUIT INSIDE THE ECM. Connect the connector to ECM. Measure the resistance between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 6 - Engine ground: (E57) No. 4 - Engine ground | Is the resistance 1 Mohms or more? | Go to step 26 . | Repair the short circuit to ground in harness between ECM and electronic throttle control connector. Replace the ECM if defective. Refer to ENGINE CONTROL MODULE (ECM) . |
| 26 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Disconnect the connectors from ECM. Measure the resistance of harness between ECM and electronic throttle control connector. Connector&terminal (B134) No. 18 - (E57) No. 6: (B134) No. 28 - (E57) No. 4: (B134) No. 29 - (E57) No. 3 | Is the resistance less than 1 ohms? | Go to step 27 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and electronic throttle control connector Poor contact of coupling connector |
| 27 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Connect the connector to ECM. Measure the resistance between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 3 - Engine ground | Is the resistance less than 5 ohms? | Go to step 28 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit of harness between ECM and engine ground Poor contact of ECM connector Poor contact of coupling connector |
| 28 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to ON. Measure the voltage between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 6 (+) - Engine ground (-): (E57) No. 4 (+) - Engine ground (-) | Is the voltage 4.85 V or more? | Repair the short circuit to power in harness between ECM and electronic throttle control connector. | Go to step 29 . |
| 29 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between ECM connectors. Connector&terminal (B134) No. 19 - (B134) No. 18: (B134) No. 19 - (B134) No. 28 | Is the resistance 1 Mohms or more? | Go to step 30 . | Repair the short circuit to power in harness between ECM and electronic throttle control connector. |
| 30 CHECK SENSOR OUTPUT. Connect all connectors. Turn the ignition switch to ON. Read the data of main throttle sensor signal using Subaru Select Monitor. NOTE: For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . | Is the voltage 0.81 - 0.87 V? | Go to step 31 . | Repair the poor contact of electronic throttle control connector. Replace the electronic throttle control if defective. Refer to THROTTLE BODY . |
| 31 CHECK SENSOR OUTPUT. Read the data of sub throttle sensor signal using Subaru Select Monitor. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . | Is the voltage 1.64 - 1.70 V? | Go to step 32 . | Repair the poor contact of electronic throttle control connector. Replace the electronic throttle control if defective. Refer to THROTTLE BODY . |
| 32 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and electronic throttle control. Measure the resistance between ECM and electronic throttle control connector. Connector&terminal (B137) No. 5 - (E57) No. 2: (B137) No. 4 - (E57) No. 1 | Is the resistance less than 1 ohms? | Go to step 33 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and electronic throttle control connector Poor contact of coupling connector |
| 33 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR. Connect the connector to ECM. Turn the ignition switch to ON. Measure the voltage between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 2 (+) - Engine ground (-): (E57) No. 1 (+) - Engine ground (-) | Is the voltage 5 V or more? | Repair the short circuit to power in harness between ECM and electronic throttle control connector. | Go to step 34 . |
| 34 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 2 - Engine ground: (E57) No. 1 - Engine ground | Is the resistance 1 Mohms or more? | Go to step 35 . | Repair the short circuit to ground in harness between ECM and electronic throttle control connector. |
| 35 CHECK ELECTRONIC THROTTLE CONTROL MOTOR HARNESS. Measure the resistance between electronic throttle control connectors. Connector&terminal (E57) No. 2 - (E57) No. 1 | Is the resistance 1 Mohms or more? | Go to step 36 . | Repair the short circuit of harness between ECM and electronic throttle control connector. |
| 36 CHECK ELECTRONIC THROTTLE CONTROL GROUND CIRCUIT. Measure the resistance between ECM and chassis ground. Connector&terminal (B134) No. 5 - Chassis ground: (B137) No. 1 - Chassis ground: (B137) No. 2 - Chassis ground: (B137) No. 3 - Chassis ground: (B137) No. 7 - Chassis ground | Is the resistance less than 5 ohms? | Go to step 37 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit of harness between ECM and engine ground Poor contact of coupling connector |
| 37 CHECK ELECTRONIC THROTTLE CONTROL. Measure the resistance between electronic throttle control terminals. Terminals No. 2 - No. 1 | Is the resistance 50 ohms or less? | Go to step 38 . | Replace the electronic throttle control. Refer to THROTTLE BODY . |
| 38 CHECK ELECTRONIC THROTTLE CONTROL. Move the throttle valve to the fully open and fully closed positions with fingers. Check that the valve returns to the specified position when releasing fingers. | Does the valve return to the specified position?Standard value: 3 mm (0.12 in) from fully closed position | Repair the poor contact of ECM connector. | Replace the electronic throttle control. Refer to THROTTLE BODY . |
| WARNING |
|---|
| Place "NO OPEN FLAMES" signs near the working area. |
| CAUTION |
|---|
| Be careful not to spill fuel. |
| CAUTION |
|---|
| Release fuel pressure before removing the fuel pressure gauge. |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
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| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
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| In this case, repair the following item |
| NOTE |
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| In this case, repair the following item |
| NOTE |
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| In this case, repair the following item |
| NOTE |
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| In this case, repair the following item |
| NOTE |
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| For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . |
| NOTE |
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| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . |
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| In this case, repair the following item |
| NOTE |
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| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FOR ANY OTHER DTC ON DISPLAY. | Is any other DTC displayed? | Check DTC using "List of Diagnostic Trouble Code (DTC)". Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . | Go to step 2 . |
| 2 CHECK FRONT OXYGEN (A/F) SENSOR CONNECTOR AND COUPLING CONNECTOR. | Has water entered the connector? | Completely remove any water inside. | Go to step 3 . |
| 3 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and front oxygen (A/F) sensor. Measure the resistance of harness between ECM and front oxygen (A/F) sensor connector. Connector&terminal (B135) No. 9 - (E22) No. 1: (B135) No. 8 - (E22) No. 3 | Is the resistance less than 1 ohms? | Go to step 4 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and front oxygen (A/F) sensor connector Poor contact of coupling connector |
| 4 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. Measure the resistance between ECM and chassis ground. Connector&terminal (B135) No. 9 - Chassis ground: (B135) No. 8 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 5 . | Repair the ground short circuit of harness between ECM and front oxygen (A/F) sensor connector. |
| 5 CHECK OUTPUT SIGNAL FOR ECM. Connect the connector to ECM. Turn the ignition switch to ON. Measure the voltage between front oxygen (A/F) sensor connector and chassis ground. Connector&terminal (E22) No. 1 (+) - Chassis ground (-) | Is the voltage 4.5 V or more? | Go to step 7 . | Go to step 6 . |
| 6 CHECK OUTPUT SIGNAL FOR ECM. Measure the voltage between front oxygen (A/F) sensor connector and chassis ground. Connector&terminal (E22) No. 3 (+) - Chassis ground (-) | Is the voltage 4.95 V or more? | Go to step 7 . | Go to step 8 . |
| 7 CHECK OUTPUT SIGNAL FOR ECM. Measure the voltage between front oxygen (A/F) sensor connector and chassis ground. Connector&terminal (E22) No. 1 (+) - Chassis ground (-): (E22) No. 3 (+) - Chassis ground (-) | Is the voltage 8 V or more? | Repair the short circuit to power in the harness between ECM and front oxygen (A/F) sensor connector. After repair, replace the ECM. Refer to ENGINE CONTROL MODULE (ECM) . | Repair the poor contact of ECM connector. |
| 8 CHECK EXHAUST SYSTEM. | Are there holes or loose bolts on exhaust system? | Repair the exhaust system. | Go to step 9 . |
| 9 CHECK AIR INTAKE SYSTEM. | Are there holes, loose bolts or disconnection of hose on air intake system? | Repair the air intake system. | Go to step 10 . |
| 10 CHECK FUEL PRESSURE. WARNING: Place "NO OPEN FLAMES" signs near the working area. CAUTION: Be careful not to spill fuel. Connect the front oxygen (A/F) sensor connector. Measure the fuel pressure. Refer to INSPECTION , Fuel Pressure. CAUTION: Release fuel pressure before removing the fuel pressure gauge. | Is the measured value 333.4- 360.5 kPa (3.4 - 3.7 kg/cm 2 , 48.4 -52 psi)? | Go to step 11. | Repair the following item. Fuel pressure is too high: Clogged fuel line or bent hose Fuel pressure is too low: Improper fuel pump discharge Clogged fuel line |
| 11 CHECK ENGINE COOLANT TEMPERATURE SENSOR. Start the engine and warm up completely. Read the data of engine coolant temperature sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the engine coolant temperature 75°C (167°F) or higher? | Go to step 12 . | Replace the engine coolant temperature sensor. Refer to ENGINE COOLANT TEMPERATURE SENSOR . |
| 12 CHECK MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR. Start the engine and warm up engine until coolant temperature is higher than 75°C (167°F). For AT models, set the select lever to "P" range or "N" range, and for MT models, place the shift lever in the neutral position. Turn the A/C switch to OFF. Turn all the accessory switches to OFF. Read the data of the mass air flow and intake air temperature sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the measured value 2.0 - 5.0 g/s (0.26 - 0.66 lb/m)? | Go to step 13 . | Replace the mass air flow and intake air temperature sensor. Refer to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . |
| 13 CHECK MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR. Start the engine and warm up engine until coolant temperature is higher than 75°C (167°F). For AT models, set the select lever to "P" range or "N" range, and for MT models, place the shift lever in the neutral position. Turn the A/C switch to OFF. Turn all the accessory switches to OFF. Open the front hood. Measure the ambient temperature. Read the data of the mass air flow and intake air temperature sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Subtract ambient temperature from intake air temperature. Is the obtained value -10-50°C (-18 -90°F)? | Go to step 14 . | Check the mass air flow and intake air temperature sensor. Refer to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . |
| 14 CHECK REAR OXYGEN SENSOR DATA. Warm up the engine until engine coolant temperature is higher than 75°C (167°F), and keep the engine speed at 3,000 rpm. (2 minutes maximum) Read the data of rear oxygen sensor signal using Subaru Select Monitor or general scan tool. NOTE: Depress the clutch pedal. (MT model) Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the voltage 490 mV or more? | Go to step 15 . | Go to step 16 . |
| 15 CHECK REAR OXYGEN SENSOR DATA. Warm up the engine until engine coolant temperature is higher than 75°C (167°F), and rapidly reduce the engine speed from 3,000 rpm. Read the data of rear oxygen sensor signal using Subaru Select Monitor or general scan tool. NOTE: Depress the clutch pedal. (MT model) Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is the voltage 250 mV or less? | Go to step 17 . | Go to step 16 . |
| 16 CHECK REAR OXYGEN SENSOR CONNECTOR AND COUPLING CONNECTOR. | Has water entered the connector? | Completely remove any water inside. | Go to step 18 . |
| 17 CHECK FRONT OXYGEN (A/F) SENSOR AND REAR OXYGEN SENSOR DATA. Warm up the engine until engine coolant temperature is higher than 75°C (167°F), then keep the engine idling for 5 minutes or more. Read the data of rear oxygen sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. | Is a voltage of 0.8 V or more maintained for 5 minutes or more? | Replace the front oxygen (A/F) sensor. Refer to FRONT OXYGEN (A/F) SENSOR . | Go to step 18 . |
| 18 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM and rear oxygen sensor. Measure the resistance of harness between ECM and rear oxygen sensor connector. Connector&terminal (B135) No. 4 - (E23) No. 3: (B134) No. 29 - (E23) No. 4 | Is the resistance less than 1 ohms? | Go to step 19 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and rear oxygen sensor connector Poor contact of coupling connector |
| 19 CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR. Connect the connector to ECM. Turn the ignition switch to ON. Measure the voltage between rear oxygen sensor connector and chassis ground. Connector&terminal (E23) No. 3 (+) - Chassis ground (-) | Is the voltage 0.2 - 0.5 V? | Replace the rear oxygen sensor. Refer to REAR OXYGEN SENSOR . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and rear oxygen sensor connector Poor contact of ECM connector Poor contact of coupling connector |
| NOTE |
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| In this case, repair the following item |
| WARNING |
|---|
| Place "NO OPEN FLAMES" signs near the working area. |
| CAUTION |
|---|
| Be careful not to spill fuel. |
| CAUTION |
|---|
| Release fuel pressure before removing the fuel pressure gauge. |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| Depress the clutch pedal. (MT model) Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| Depress the clutch pedal. (MT model) Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
| NOTE |
|---|
| Subaru Select Monitor For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . General scan tool For detailed operation procedures, see the general scan tool operation information. |
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| In this case, repair the following item |
| NOTE |
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| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK ELECTRONIC THROTTLE CONTROL RELAY. Turn the ignition switch to OFF. Remove the electronic throttle control relay. Connect the battery to terminals No. 31 and No. 32 of electronic throttle control relay. Measure the resistance between electronic throttle control relay terminals. Terminals No. 29 - No. 30 | Is the resistance less than 1 ohms? | Go to step 2 . | Replace the electronic throttle control relay. Refer to ELECTRONIC THROTTLE CONTROL RELAY . |
| 2 CHECK POWER SUPPLY OF ELECTRONIC THROTTLE CONTROL RELAY. Measure the voltage between electronic throttle control relay connector and chassis ground. Connector&terminal (B220) No. 29 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Go to step 3 . | Repair the open or ground short circuit of power supply circuit. |
| 3 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. Disconnect the connectors from ECM. Turn the ignition switch to ON. Measure the voltage between electronic throttle control relay connector and chassis ground. Connector&terminal (B220) No. 32 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the short circuit to power in the harness between ECM and electronic throttle control relay connector. | Go to step 4 . |
| 4 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. Turn the ignition switch to OFF. Measure the resistance between electronic throttle control relay connector and chassis ground. Connector&terminal (B220) No. 32 - Chassis ground: (B220) No. 30 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 5 . | Repair the short circuit in harness to ground between ECM and electronic throttle control relay connector. |
| 5 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. Measure the resistance between ECM and electronic throttle control relay connector. Connector&terminal (B136) No. 21 - (B220) No. 32: (B136) No. 1 - (B220) No. 30 | Is the resistance less than 1 ohms? | Go to step 6 . | Repair the open circuit in harness between ECM and electronic throttle control relay connector. |
| 6 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Disconnect the connectors from electronic throttle control. Measure the resistance between ECM and chassis ground. Connector&terminal (B134) No. 19 - Chassis ground: (B134) No. 18 - Chassis ground: (B134) No. 18 - (B136) No. 6: (B134) No. 28 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 7 . | Repair the short circuit to ground in harness between ECM and electronic throttle control connector. |
| 7 CHECK SHORT CIRCUIT INSIDE THE ECM. Connect the connector to ECM. Measure the resistance between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 6 - Engine ground: (E57) No. 4 - Engine ground | Is the resistance 1 Mohms or more? | Go to step 8 . | Repair the short circuit to ground in harness between ECM and electronic throttle control connector. Replace the ECM if defective. Refer to ENGINE CONTROL MODULE (ECM) . |
| 8 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Disconnect the connectors from ECM. Measure the resistance of harness between ECM and electronic throttle control connector. Connector&terminal (B134) No. 18 - (E57) No. 6: (B134) No. 28 - (E57) No. 4: (B134) No. 29 - (E57) No. 3 | Is the resistance less than 1 ohms? | Go to step 9 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and electronic throttle control connector Poor contact of coupling connector |
| 9 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Connect the connector to ECM. Measure the resistance between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 3 - Engine ground | Is the resistance less than 5 ohms? | Go to step 10 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit of harness between ECM and engine ground Poor contact of ECM connector Poor contact of coupling connector |
| 10 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to ON. Measure the voltage between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 6 (+) - Engine ground (-): (E57) No. 4 (+) - Engine ground (-) | Is the voltage 4.85 V or more? | Repair the short circuit to power in harness between ECM and electronic throttle control connector. | Go to step 11 . |
| 11 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between ECM connectors. Connector&terminal (B134) No. 19 - (B134) No. 18: (B134) No. 19 - (B134) No. 28 | Is the resistance 1 Mohms or more? | Go to step 12 . | Repair the short circuit to power in harness between ECM and electronic throttle control connector. |
| 12 CHECK SENSOR OUTPUT. Connect all connectors. Turn the ignition switch to ON. Read the data of main throttle sensor signal using Subaru Select Monitor. NOTE: For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . | Is the voltage 0.81 - 0.87 V? | Go to step 13. | Repair the poor contact of electronic throttle control connector. Replace the electronic throttle control if defective. Refer to THROTTLE BODY . |
| 13 CHECK SENSOR OUTPUT. Read the data of sub throttle sensor signal using Subaru Select Monitor. NOTE: Subaru Select Monitor for detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . | Is the voltage 1.64 - 1.70 V? | Go to step 14 . | Repair the poor contact of electronic throttle control connector. Replace the electronic throttle control if defective. Refer to THROTTLE BODY . |
| 14 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and electronic throttle control. Measure the resistance between ECM and electronic throttle control connector. Connector&terminal (B137) No. S - (E57) No. 2: (B137) No. 4 - (E57) No. 1 | Is the resistance less than 1 ohms? | Go to step 15 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and electronic throttle control connector Poor contact of coupling connector |
| 15 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR. Connect the connector to ECM. Turn the ignition switch to ON. Measure the voltage between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 2 (+) - Engine ground (-): (E57) No. 1 (+) - Engine ground (-) | Is the voltage 5 V or more? | Repair the short circuit to power in harness between ECM and electronic throttle control connector. | Go to step 16 . |
| 16 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 2 - Engine ground: (E57) No. 1 - Engine ground | Is the resistance 1 Mohms or more? | Go to step 17 . | Repair the short circuit to ground in harness between ECM and electronic throttle control connector. |
| 17 CHECK ELECTRONIC THROTTLE CONTROL MOTOR HARNESS. Measure the resistance between electronic throttle control connectors. Connector&terminal (E57) No. 2 - (E57) No. 1 | Is the resistance 1 Mohms or more? | Go to step 18 . | Repair the short circuit of harness between ECM and electronic throttle control connector. |
| 18 CHECK ELECTRONIC THROTTLE CONTROL GROUND CIRCUS. Measure the resistance between ECM and chassis ground. Connector&terminal (B134) No. 5 - Chassis ground: (B137) No. 1 - Chassis ground: (B137) No. 2 - Chassis ground: (B137) No. 3 - Chassis ground: (B137) No. 7 - Chassis ground | Is the resistance less than 5 ohms? | Go to step 19 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit of harness between ECM and engine ground Poor contact of coupling connector |
| 19 CHECK ELECTRONIC THROTTLE CONTROL. Measure the resistance between electronic throttle control terminals. Terminals No. 2 - No. 1 | Is the resistance 50 ohms or less? | Go to step 20 . | Replace the electronic throttle control. Refer to THROTTLE BODY . |
| 20 CHECK ELECTRONIC THROTTLE CONTROL. Move the throttle valve to the fully open and fully closed positions with fingers. Check that the valve returns to the specified position when releasing fingers. | Does the valve return to the specified position?Standard value: 3 mm (0.12 in) from fully closed position | Repair the poor contact of ECM connector. | Replace the electronic throttle control. Refer to THROTTLE BODY . |
| NOTE |
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| In this case, repair the following item |
| NOTE |
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| In this case, repair the following item |
| NOTE |
|---|
| For detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . |
| NOTE |
|---|
| Subaru Select Monitor for detailed operation procedures, see "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR . |
| NOTE |
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| In this case, repair the following item |
| NOTE |
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| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK ELECTRONIC THROTTLE CONTROL RELAY. Turn the ignition switch to OFF. Remove the electronic throttle control relay. Measure the resistance between electronic throttle control relay terminals. Terminals No. 29 - No. 30 | Is the resistance 1 Mohms or more? | Go to step 2 . | Replace the electronic throttle control relay. Refer to ELECTRONIC THROTTLE CONTROL RELAY |
| 2 CHECK SHORT CIRCUIT OF ELECTRONIC THROTTLE CONTROL RELAY POWER SUPPLY. Turn the ignition switch to ON. Measure the voltage between electronic throttle control relay connector and chassis ground. Connector&terminal (B220) No. 30 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Repair the short circuit to power in the harness between ECM and electronic throttle control relay connector. | Go to step 3 . |
| 3 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between ECM and chassis ground. Connector&terminal (B136) No. 21 - Chassis ground | Is the resistance 1 Mohms or more? | Repair the poor contact of ECM connector. | Repair the short circuit in harness to ground between ECM and electronic throttle control relay connector. |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and accelerator pedal position sensor. Measure the resistance of harness between ECM and accelerator pedal position sensor connector. Connector&terminal (B135) No. 23 - (B315) No. 6: (B135) No. 29 - (B315) No. 5 | Is the resistance less than 1 ohms? | Go to step 2 . | Repair the open circuit in harness between ECM and accelerator pedal position sensor connector. |
| 2 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Connect the connector to ECM. Measure the resistance between accelerator pedal position sensor connector and chassis ground. Connector&terminal (B315) No. 5 - Chassis ground | Is the resistance less than 5 ohms? | Go to step 3 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit of harness between ECM and engine ground Poor contact of ECM connector Poor contact of coupling connector |
| 3 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Turn the ignition switch to ON. Measure the voltage between accelerator pedal position sensor connector and chassis ground. Connector&terminal (B315) No. 6 (+) - Chassis ground (-) | Is the voltage 4.85 V or more? | Repair the short circuit to power supply in the harness between the ECM and accelerator pedal position sensor connector. | Go to step 4 . |
| 4 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between ECM connectors. Connector&terminal (B135) No. 21 - (B135) No. 23 | Is the resistance 1 Mohms or more? | Repair the poor contact of accelerator pedal position sensor connector. Replace the accelerator pedal if defective. Refer to ACCELERATOR PEDAL . | Repair the short circuit to power supply in the harness between the ECM and accelerator pedal position sensor connector. |
| NOTE |
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| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and accelerator pedal position sensor. Measure the resistance between ECM and chassis ground. Connector&terminal (B135) No. 22 - Chassis ground: (B135) No. 31 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 2 . | Repair the short circuit to ground in harness between ECM and accelerator pedal position sensor connector. |
| 2 CHECK SHORT CIRCUIT INSIDE THE ECM. Connect the connector to ECM. Measure the resistance between accelerator pedal position sensor connector and chassis ground. Connector&terminal (B315) No. 3 - Chassis ground | Is the resistance 1 Mohms or more? | Replace the accelerator pedal. Refer to ACCELERATOR PEDAL . | Repair the short circuit to ground in harness between ECM and accelerator pedal position sensor connector. Replace the ECM if defective. Refer to ENGINE CONTROL MODULE (ECM) . |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and accelerator pedal position sensor. Measure the resistance of harness between ECM and accelerator pedal position sensor connector. Connector&terminal (B135) No. 31 - (B315) No. 3: (B135) No. 30 - (B315) No. 2 | Is the resistance less than 1 ohms? | Go to step 2 . | Repair the harness and connector. Open circuit in harness between ECM and accelerator pedal position sensor connector Poor contact of joint connector |
| 2 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Connect the connector to ECM. Measure the resistance between accelerator pedal position sensor connector and chassis ground. Connector&terminal (B315) No. 2 - Chassis ground | Is the resistance less than 1 ohms? | Go to step 3 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit of harness between ECM and engine ground Poor contact of ECM connector Poor contact of coupling connector |
| 3 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Turn the ignition switch to ON. Measure the voltage between accelerator pedal position sensor connector and chassis ground. Connector&terminal (B315) No. 3 (+) - Chassis ground (-) | Is the voltage 4.85 V or more? | Repair the short circuit to power supply in the harness between the ECM and accelerator pedal position sensor connector. | Go to step 4 . |
| 4 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between ECM connectors. Connector&terminal (B135) No. 22 - (B135) No. 31 | Is the resistance 1 Mohms or more? | Repair the poor contact of accelerator pedal position sensor connector. Replace the accelerator pedal if defective. Refer to ACCELERATOR PEDAL . | Repair the short circuit to power supply in the harness between the ECM and accelerator pedal position sensor connector. |
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| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Disconnect the connectors from ECM and electronic throttle control. Measure the resistance between ECM and chassis ground. Connector&terminal (B134) No. 19 - Chassis ground: (B134) No. 18 - Chassis ground: (B134) No. 18 - (B136) No. 6: (B134) No. 28 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 2 . | Repair the short circuit to ground in harness between ECM and electronic throttle control connector. |
| 2 CHECK SHORT CIRCUIT INSIDE THE ECM. Connect the connector to ECM. Measure the resistance between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 6-Engine ground: (E57) No. 4 - Engine ground | Is the resistance 1 Mohms or more? | Go to step 3 . | Repair the short circuit to ground in harness between ECM and electronic throttle control connector. Replace the ECM if defective. Refer to ENGINE CONTROL MODULE (ECM) . |
| 3 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Disconnect the connectors from ECM. Measure the resistance of harness between ECM and electronic throttle control connector. Connector&terminal (B134) No. 18 - (E57) No. 6: (B134) No. 28 - (E57) No. 4: (B134) No. 29 - (E57) No. 3 | Is the resistance less than 1 ohms? | Go to step 4 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and electronic throttle control connector Poor contact of coupling connector |
| 4 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Connect the connector to ECM. Measure the resistance between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 3-Engine ground | Is the resistance less than 5 ohms? | Go to step 5 . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit of harness between ECM and engine ground Poor contact of ECM connector Poor contact of coupling connector |
| 5 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to ON. Measure the voltage between electronic throttle control connector and engine ground. Connector&terminal (E57) No. 6 (+) - Engine ground (-): (E57) No. 4 (+) - Engine ground (-) | Is the voltage 4.85 V or more? | Repair the short circuit to power in harness between ECM and electronic throttle control connector. | Go to step 6 . |
| 6 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between ECM connectors. Connector&terminal (B134) No. 19 - (B134) No. 18: (B134) No. 19 - (B134) No. 28 | Is the resistance 1 Mohms or more? | Repair the poor contact of electronic throttle control connector. Replace the electronic throttle control if defective. Refer to THROTTLE BODY . | Repair the short circuit to power in harness between ECM and electronic throttle control connector. |
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| In this case, repair the following item |
| NOTE |
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| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK ACCELERATOR PEDAL POSITION SENSOR OUTPUT. Turn the ignition switch to ON. Measure the voltage between ECM and chassis ground. Connector&terminal Main accelerator pedal position sensor signal (B135) No. 23 (+) - Chassis ground (-): Sub accelerator pedal position sensor signal (B135) No. 31 (+) - Chassis ground (-) | Is the difference in measured values for the main accelerator pedal position sensor signal and the sub accelerator pedal position sensor signal 0 V? | Go to step 3 . | Go to step 2 . |
| 2 CHECK ACCELERATOR PEDAL POSITION SENSOR OUTPUT. Measure the voltage between accelerator pedal position sensor connector and chassis ground. Connector&terminal (B315) No. 6 (+) - Chassis ground (-): (B315) No. 3 (+) - Chassis ground (-) | Is the difference in measured values for the main accelerator pedal position sensor signal and the sub accelerator pedal position sensor signal 0 V? | Replace the accelerator pedal. Refer to ACCELERATOR PEDAL . | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and accelerator pedal position sensor connector Short circuit to ground in harness between ECM and accelerator pedal position sensor connector Poor contact of coupling connector |
| 3 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR CONNECTOR. Measure the resistance of harness between accelerator pedal position sensor connector and chassis ground. Connector&terminal (B315) No. 5 - Chassis ground: (B315) No. 2 - Chassis ground | Is the resistance less than 5 ohms? | Repair the poor contact of ECM connector. | Repair the harness and connector. NOTE: In this case, repair the following item Open circuit in harness between ECM and accelerator pedal position sensor connector Open circuit of harness between ECM and engine ground Poor contact of ECM connector Poor contact of coupling connector |
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| In this case, repair the following item |
| NOTE |
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| In this case, repair the following item |
DIAGNOSTIC PROCEDURE CHART