Subaru Crosstrek Service Manual: Dtc p2758 torque converter clutch pressure control solenoid control circuit stuck on

Subaru Crosstrek Service Manual / Continuously variable transmission (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p2758 torque converter clutch pressure control solenoid control circuit stuck on

CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON

DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

Trouble symptom:

The engine stalls when the vehicle is stopped.

CAUTION:

Use the check board when measuring the TCM terminal voltage and resistance.

Wiring diagram:

CVT control system CVT Control System">

STEP	CHECK	YES	NO

1.CHECK DTC.

Read the DTC using Subaru Select Monitor.

Is a DTC other than DTC P2758 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">Go to Step 2.

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">Go to Step 8.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON">Go to Step 3.

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. 11 — Transmission body:

Is the resistance approx. 10 — 13.5 ?? (when cold)

Replace the control valve body. Control Valve Body">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON">Go to Step 4.

4.CHECK HARNESS.

1) Disconnect the TCM connector.

2) Measure the resistance between TCM connector and transmission connectors.

Connector & terminal

(B54) No. 15 — (B11) No. 11:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON">Go to Step 5.

Repair the open circuit of harness.

5.CHECK HARNESS.

Measure the resistance between TCM connector and transmission body.

Connector & terminal

(B54) No. 15 — Transmission body:

Is the resistance 1 M? or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON">Go to Step 6.

Repair the short circuit of harness.

6.CHECK HARNESS.

CAUTION:

Start work after ATF cools down.

1) Remove the transmission valve cover.

2) Disconnect the control valve body connector.

3) Measure the resistance between transmission connector and control valve body connector.

Connector & terminal

(T4) No. 11 — (T11) No. 9:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON">Go to Step 7.

Repair the open circuit of harness.

7.CHECK HARNESS.

Measure the resistance between transmission connector and control valve body.

Connector & terminal

(T11) No. 9 — Control valve body:

Is the resistance 1 M? or more?

Replace the control valve body. Control Valve Body">

Repair the short circuit of harness.

8.CHECK TRANSMISSION FLUID.

1) Connect all connectors.

2) Check the amount of ATF. CVTF > ADJUSTMENT">

Is the check result OK?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON">Go to Step 9.

Adjust the amount of ATF. CVTF > ADJUSTMENT">

9.CHECK TRANSMISSION FLUID.

Check the condition of ATF. CVTF > CONDITION CHECK">

Is the check result OK?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON">Go to Step 10.

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

10.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?

Replace the control valve body. Control Valve Body">
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2758 TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT STUCK ON">Go to Step 11.

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">

11.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 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.

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 P2758 displayed? Or does the engine stall?

Replace the torque converter assembly. Torque Converter Assembly">

Current condition is normal. It is possible that temporary poor contact occurs.

1. OUTLINE OF DIAGNOSIS

• 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 open request has been issued.

2. EXECUTION CONDITION

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 1

Engine coolant temperature (degC)	− 40	− 20	0	20	40	60	80	100
Engine torque (N·m)	80	80	80	80	80	50	50	50

3. DIAGNOSTIC METHOD

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
ABS (Engine speed − Measured turbine shaft speed)	< Table 2 rpm

Table 2

Engine speed (rpm)	0	500	1000	1500	2000	2500	3000	3500
ABS (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
ABS (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.

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