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Subaru Legacy Service Manual: Dtc p2757 torque converter clutch pressure control solenoid control circuit performance/stuck off

Subaru Legacy Service Manual / Continuously variable transmission (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p2757 torque converter clutch pressure control solenoid control circuit performance/stuck off

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM:

No lock-up occurs.

1. ENGINE TYPE FB

WIRING DIAGRAM:

CVT control system CVT Control System > WIRING DIAGRAM

STEPCHECKYESNO

1.CHECK DTC.

Read the DTC using Subaru Select Monitor.

Besides DTC P2757, is any of the DTC P0717, P2763, P2764, U0100 or U0401 displayed-

Perform the diagnosis according to DTCs other than P2757.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

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 P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

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 P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

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 P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

Repair the harness.

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 P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

Adjust the amount of ATF. CVTF > ADJUSTMENT

6.CHECK TRANSMISSION FLUID.

Check the condition of ATF. CVTF > CONDITION CHECK

Is the ATF OK-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

Check according to the “Corrective action” of ATF (CVTF) “CONDITION CHECK”. CVTF > CONDITION CHECK

7.CHECK INPUT SIGNAL FOR TCM.

1) Lift up the vehicle.

2) Start the engine.

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 P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

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.

3) Start the engine.

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 70% or more, and «Front Wheel Speed» is 40 km/h (25 MPH) or more, which are displayed on the Subaru Select Monitor.

6) Turn the ignition switch to OFF.

7) Start the engine.

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 P2757 displayed-

Perform the secondary pressure test. Secondary Pressure (Line Pressure) Test When DTC other than P2757 is displayed, perform the diagnosis corresponding 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

STEPCHECKYESNO

1.CHECK DTC.

Read the DTC using Subaru Select Monitor.

Besides DTC P2757, is any of the DTCs P2747, P2763, P2764, U0100 and U0401 displayed-

Perform the diagnosis according to DTCs other than P2757.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

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 P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

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 P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

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 P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

Repair the harness.

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 P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

Adjust the amount of ATF. CVTF > ADJUSTMENT

6.CHECK TRANSMISSION FLUID.

Check the condition of ATF. CVTF > CONDITION CHECK

Is the ATF OK-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

Check according to the “Corrective action” of ATF (CVTF) “CONDITION CHECK”. CVTF > CONDITION CHECK

7.CHECK INPUT SIGNAL FOR TCM.

1) Lift up the vehicle.

2) Start the engine.

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 P2757 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT PERFORMANCE/STUCK OFF

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.

3) Start the engine.

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 70% or more, and «Front Wheel Speed» is 40 km/h (25 MPH) or more, which are displayed on the Subaru Select Monitor.

6) Turn the ignition switch to OFF.

7) Start the engine.

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 P2757 displayed-

Perform the secondary pressure test. Secondary Pressure (Line Pressure) Test When DTC other than P2757 is displayed, perform the diagnosis corresponding 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 low pressure side).

Judge as NG if the deviation between engine speed and turbine speed is the predetermined value or more, even though the lock-up 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

Commanded duty of torque converter clutch pressure control solenoid

≥ 95%

Measured turbine shaft speed

> Table1 rpm

Table 1

Engine speed (rpm)

3700

3727

3755

3782

3856

4019

4213

4456

Measured turbine shaft speed (rpm)

0

500

1000

1500

2000

2500

3000

3500

Engine speed (rpm)

4786

5213

5651

6101

6569

7044

7520

Measured turbine shaft speed (rpm)

4000

4500

5000

5500

6000

6500

7000

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 Value

Malfunction Criteria

Threshold Value

|Engine speed − Measured turbine shaft speed|

> Table 2 rpm

Table 2

Engine speed (rpm)

0

500

1000

1500

2000

2500

3000

3500

|Engine speed − Measured turbine shaft speed|(rpm)

200

200

200

200

200

200

200

200

Engine speed (rpm)

4000

4500

5000

5500

6000

6500

7000

|Engine speed − Measured turbine shaft speed|(rpm)

200

200

200

200

200

200

200

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 low pressure side).

Judge as NG if the deviation between engine speed and primary pulley speed becomes equal to or larger than the predetermined value, even though the lock-up command is issued.

7. EXECUTION CONDITION (ENGINE TYPE EZ)

Secondary Parameters

Execution condition

12 V battery system voltage

≥ 10 V

Engine speed

≥ 1000 rpm

Transmission range

Drive

Commanded duty of torque converter clutch pressure control solenoid

≥ 95%

Measured primary pulley shaft speed

> Table 3 rpm

Table 3

Engine speed (rpm)

3700

3727

3755

3782

3856

4019

4213

4456

Measured primary pulley shaft speed (rpm)

0

500

1000

1500

2000

2500

3000

3500

Engine speed (rpm)

4786

5213

5651

6101

6569

7044

7520

Measured primary pulley shaft speed (rpm)

4000

4500

5000

5500

6000

6500

7000

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 Value

Malfunction Criteria

Threshold Value

|Engine speed − Measured primary pulley shaft speed|

> Table 4 rpm

Table 4

Measured primary pulley shaft speed (rpm)

0

500

1000

1500

2000

2500

3000

3500

|Engine speed − Measured primary pulley shaft speed|(rpm)

200

200

200

200

200

200

200

200

Measured primary pulley shaft speed (rpm)

4000

4500

5000

5500

6000

6500

7000

|Engine speed − Measured primary pulley shaft speed|(rpm)

200

200

200

200

200

200

200

Time Needed for Diagnosis: 10 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

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