DTC DETECTING CONDITION: Detected when two consecutive driving cycles with fault occur. TROUBLE SYMPTOM: The engine stalls when the vehicle is stopped. 1. ENGINE TYPE FB WIRING DIAGRAM: CVT control system CVT Control System > WIRING DIAGRAM 
| STEP | CHECK | YES | NO | 1.CHECK DTC. Read the DTC using Subaru Select Monitor. | Besides DTC P2758, is any of the DTC P0717, P2763, P2764, U0100 or U0401 displayed- | Perform the diagnosis according to DTCs other than P2758. | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | 2.CHECK LOCK-UP DUTY SOLENOID (ACTIVE TEST). 1) Turn the ignition switch to ON. 2) Using the Subaru Select Monitor, perform forced operation of the lock-up duty solenoid. Active Test | Does the indication of 0 > 50% appear repeatedly during forced operation, and does operating sound emit during indicating 50%- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | 3.CHECK LOCK-UP DUTY SOLENOID. 1) Turn the ignition switch to OFF. 2) Disconnect the TCM connector. 3) Measure the resistance between TCM connector and transmission body. Connector & terminal (T10) No. 15 — Transmission body: | Is the resistance approx. 10 — 13.5 -- (when cold) | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | 4.CHECK HARNESS. Check the harness for continuity. | Is the harness normal- (Is it free from defects such as open circuit, power supply-output short or GND-output short circuit, or poor contact-) | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | | 5.CHECK TRANSMISSION FLUID. 1) Connect the TCM connector. 2) Check the amount of ATF. CVTF > ADJUSTMENT | Is the ATF amount correct- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | Adjust the amount of ATF. CVTF > ADJUSTMENT | 6.CHECK TRANSMISSION FLUID. Check the condition of ATF. CVTF > CONDITION CHECK | | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | Check according to the “Corrective action” of ATF (CVTF) “CONDITION CHECK”. CVTF > CONDITION CHECK | 7.CHECK INPUT SIGNAL FOR TCM. 3) Warm up until the ATF temperature reaches to 40 — 70°C (104 — 158°F). 4) Depress the brake pedal, and shift the select lever to “D” range. 5) Shift the select lever to “P” range. 6) Stabilize the engine speed at idle. 7) Read the data of «Actual secondary pressure» using Subaru Select Monitor. | Is the «Actual secondary pressure» 0.5 — 1.5 MPa- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | Perform the diagnosis according to DTC P0841. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0841 TRANSMISSION FLUID PRESSURE SENSOR/SWITCH “A” CIRCUIT RANGE/PERFORMANCE | 8.ACTUAL DRIVING CHECK FOR LOCK-UP CONDITION. 1) Perform the Clear Memory Mode. Clear Memory Mode 2) Turn the ignition switch to OFF. 4) Warm up until the ATF temperature exceeds 50°C. 5) Drive the vehicle for one minute or more while keeping such constant speed that «Lock Up Duty Ratio» is 0%, and «Front Wheel Speed» is 5 km/h (3 MPH) or less, which are displayed on the Subaru Select Monitor. 6) Turn the ignition switch to OFF. 8) Perform the procedure in step 5) again. 9) Read the DTC using Subaru Select Monitor. | Does the AT OIL TEMP light blink and is DTC P2758 displayed- Or does the engine stall- | Perform the secondary pressure test. Secondary Pressure (Line Pressure) Test When DTC other than P2758 is displayed, perform the diagnosis according to the DTC. | Current condition is normal. It is possible that temporary poor contact occurs. |
2. ENGINE TYPE EZ WIRING DIAGRAM: CVT control system CVT Control System > WIRING DIAGRAM 
| STEP | CHECK | YES | NO | 1.CHECK DTC. Read the DTC using Subaru Select Monitor. | Besides DTC P2758, is any of the DTCs P2747, P2763, P2764, U0100 and U0401 displayed- | Perform the diagnosis according to DTCs other than P2758. | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | 2.CHECK LOCK-UP DUTY SOLENOID (ACTIVE TEST). 1) Turn the ignition switch to ON. 2) Using the Subaru Select Monitor, perform forced operation of the lock-up duty solenoid. Active Test | Does the indication of 0 > 50% appear repeatedly during forced operation, and does operating sound emit during indicating 50%- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | 3.CHECK LOCK-UP DUTY SOLENOID. 1) Turn the ignition switch to OFF. 2) Disconnect the transmission connector. 3) Measure the resistance between transmission connector and transmission body. Connector & terminal (T4) No. 2 — Transmission body: | Is the resistance approx. 10 — 13.5 -- (when cold) | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | 4.CHECK HARNESS. Check the harness for continuity. | Is the harness normal- (Is it free from defects such as open circuit, power supply-output short or GND-output short circuit, or poor contact-) | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | | 5.CHECK TRANSMISSION FLUID. 1) Connect the transmission connector. 2) Check the amount of ATF. CVTF > ADJUSTMENT | Is the ATF amount correct- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | Adjust the amount of ATF. CVTF > ADJUSTMENT | 6.CHECK TRANSMISSION FLUID. Check the condition of ATF. CVTF > CONDITION CHECK | | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | Check according to the “Corrective action” of ATF (CVTF) “CONDITION CHECK”. CVTF > CONDITION CHECK | 7.CHECK INPUT SIGNAL FOR TCM. 3) Warm up until the ATF temperature reaches to 40 — 70°C (104 — 158°F). 4) Depress the brake pedal, and shift the select lever to “D” range. 5) Shift the select lever to “P” range. 6) Stabilize the engine speed at idle. 7) Read the data of «Actual secondary pressure» using Subaru Select Monitor. | Is the «Actual secondary pressure» 0.5 — 1.5 MPa- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON | Perform the diagnosis according to DTC P0841. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0841 TRANSMISSION FLUID PRESSURE SENSOR/SWITCH “A” CIRCUIT RANGE/PERFORMANCE | 8.ACTUAL DRIVING CHECK FOR LOCK-UP CONDITION. 1) Perform the Clear Memory Mode. Clear Memory Mode 2) Turn the ignition switch to OFF. 4) Warm up until the ATF temperature exceeds 50°C. 5) Drive the vehicle for one minute or more while keeping such constant speed that «Lock Up Duty Ratio» is 0%, and «Front Wheel Speed» is 5 km/h (3 MPH) or less, which are displayed on the Subaru Select Monitor. 6) Turn the ignition switch to OFF. 8) Perform the procedure in step 5) again. 9) Read the DTC using Subaru Select Monitor. | Does the AT OIL TEMP light blink and is DTC P2758 displayed- Or does the engine stall- | Perform the secondary pressure test. Secondary Pressure (Line Pressure) Test When DTC other than P2758 is displayed, perform the diagnosis according to the DTC. | Current condition is normal. It is possible that temporary poor contact occurs. |
3. OUTLINE OF DIAGNOSIS (ENGINE TYPE FB) • Detect the malfunction of lock-up fluid pressure control solenoid, and hydraulic circuit, or drive circuit characteristics (stuck to high pressure side). • Judge as NG if the deviation between engine speed and turbine speed is the predetermined value or less, even though the lock-up disengagement request has been sent. 4. EXECUTION CONDITION (ENGINE TYPE FB) Secondary Parameters | Execution condition | 12 V battery system voltage | ≥ 10 V | Engine speed | ≥ 1000 rpm | Transmission range | Drive | Engine torque | > Table 1 N·m | Commanded duty of torque converter clutch pressure control solenoid | ≤ 0% |
Table 1Engine coolant temperature (degC) | − 40 | − 20 | 0 | 20 | 40 | 60 | 80 | 100 | Engine torque (N·m) | 80 | 80 | 80 | 80 | 80 | 50 | 50 | 50 | 5. DIAGNOSTIC METHOD (ENGINE TYPE FB) If the duration of time while the following conditions are met is longer than the time indicated, judge as NG. Judgment ValueMalfunction Criteria | Threshold Value | |Engine speed − Measured turbine shaft speed| | < Table 2 rpm | Table2Engine speed (rpm) | 0 | 500 | 1000 | 1500 | 2000 | 2500 | 3000 | 3500 | |Engine speed − Measured turbine shaft speed|(rpm) | 0 | 0 | 50 | 50 | 50 | 50 | 50 | 50 | Engine speed (rpm) | 4000 | 4500 | 5000 | 5500 | 6000 | 6500 | 7000 | |Engine speed − Measured turbine shaft speed|(rpm) | 50 | 50 | 50 | 50 | 50 | 50 | 50 |
Time Needed for Diagnosis: 10 seconds Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles. 6. OUTLINE OF DIAGNOSIS (ENGINE TYPE EZ) • Detect the malfunction of lock-up fluid pressure control solenoid, and hydraulic circuit, or drive circuit characteristics (stuck to high pressure side). • Judge as NG if the deviation between engine speed and primary speed is the predetermined value or less, even though the lock-up disengagement request has been sent. 7. EXECUTION CONDITION (ENGINE TYPE EZ) Secondary Parameters | Execution condition | 12 V battery system voltage | ≥ 10 V | Engine speed | ≥ 1000 rpm | Transmission range | Drive | Engine torque | > Table 3 N·m | Commanded duty of torque converter clutch pressure control solenoid | ≤ 0% |
Table 3Engine coolant temperature (degC) | − 40 | − 20 | 0 | 20 | 40 | 60 | 80 | 100 | Engine torque (N·m) | 80 | 80 | 80 | 80 | 80 | 50 | 50 | 50 | 8. DIAGNOSTIC METHOD (ENGINE TYPE EZ) If the duration of time while the following conditions are met is longer than the time indicated, judge as NG. Judgment ValueMalfunction Criteria | Threshold Value | |Engine speed − Measured primary pulley shaft speed| | < Table 4 rpm | Table 4Measured primary pulley shaft speed (rpm) | 0 | 500 | 1000 | 1500 | 2000 | 2500 | 3000 | 3500 | |Engine speed − Measured primary pulley shaft speed|(rpm) | 0 | 0 | 50 | 50 | 50 | 50 | 50 | 50 | Measured primary pulley shaft speed (rpm) | 4000 | 4500 | 5000 | 5500 | 6000 | 6500 | 7000 | |Engine speed − Measured primary pulley shaft speed|(rpm) | 50 | 50 | 50 | 50 | 50 | 50 | 50 |
Time Needed for Diagnosis: 10 seconds Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles. |
Dtc p2763 torque converter clutch pressure control solenoid control circuit high
Dtc p2757 torque converter clutch pressure control solenoid control circuit performance/stuck off