Subaru Crosstrek Service Manual: Dtc p0747 pressure control solenoid "a" stuck on

Subaru Crosstrek Service Manual / Continuously variable transmission (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0747 pressure control solenoid "a" stuck on

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

DTC P0747 PRESSURE CONTROL SOLENOID "A" STUCK ON

DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

Trouble symptom:

• Acceleration is poor during standing start.

• Shift control malfunction

Wiring diagram:

CVT control system CVT Control System">

STEP	CHECK	YES	NO

1.CHECK DTC.

Read the DTC using Subaru Select Monitor.

Besides DTC P0747, is any of the DTCs P0842, P0843, P0962 and P0963 displayed?

Perform the diagnosis according to DTCs other than P0747.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0747 PRESSURE CONTROL SOLENOID "A" STUCK ON">Go to Step 2.

2.CHECK SECONDARY SOLENOID (ACTIVE TEST).

1) Turn the ignition switch to ON.

2) Using the Subaru Select Monitor, perform forced operation of the secondary solenoid. Active Test">

Does the indication of 0 > 500 mA appear repeatedly during forced operation, and does operating sound emit during indicating 500 mA?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0747 PRESSURE CONTROL SOLENOID "A" STUCK ON">Go to Step 5.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0747 PRESSURE CONTROL SOLENOID "A" STUCK ON">Go to Step 3.

3.CHECK SECONDARY 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. 6 — Transmission body:

Is the resistance approx. 5 — 7 ?? (when cold)

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0747 PRESSURE CONTROL SOLENOID "A" STUCK ON">Go to Step 7.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0747 PRESSURE CONTROL SOLENOID "A" STUCK ON">Go to Step 4.

4.CHECK HARNESS.

Check the transmission harness. (Open circuit, short circuit to power supply, short circuit to ground, and poor contact)

Is the check result OK?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0747 PRESSURE CONTROL SOLENOID "A" STUCK ON">Go to Step 7.

Repair the harness.

5.CHECK TRANSMISSION FLUID.

1) Connect the transmission connector.

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

Is the check result OK?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0747 PRESSURE CONTROL SOLENOID "A" STUCK ON">Go to Step 6.

Adjust the amount of ATF. CVTF > ADJUSTMENT">

6.CHECK TRANSMISSION FLUID.

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

Is the check result OK?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0747 PRESSURE CONTROL SOLENOID "A" STUCK ON">Go to Step 7.

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 P0747 PRESSURE CONTROL SOLENOID "A" STUCK ON">Go to Step 8.

Replace the control valve body. Control Valve Body">

8.CHECK INPUT SIGNAL FOR TCM.

1) Keep the engine speed at 3,000 rpm.

2) Read the data of «Actual Secondary Pressure» using Subaru Select Monitor.

Is the «Actual Secondary Pressure» higher than step 7 value? Does the value change according to the engine speed, within the range of 1.5 — 2.5 MPa?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0747 PRESSURE CONTROL SOLENOID "A" STUCK ON">Go to Step 9.

Replace the control valve body. Control Valve Body">

9.CHECK TCM INPUT SIGNAL (STALL TEST).

1) Apply the parking brake.

2) Set the select lever to “D” range.

3) Depress the brake pedal firmly.

4) Slowly open the accelerator fully, and stabilize the engine speed.

5) Read the data of «Actual Secondary Pressure» using Subaru Select Monitor.

CAUTION:

Do not perform a stall test for over 5 seconds at a time.

Is the «Actual Secondary Pressure» higher than step 8 value? Does the value change according to the engine speed, within the range of 4.5 — 6.0 MPa?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0747 PRESSURE CONTROL SOLENOID "A" STUCK ON">Go to Step 10.

Replace the control valve body. Control Valve Body">

10.DRIVING CHECK BY INSPECTION MODE.

1) Turn the ignition switch to OFF.

2) Perform a drive check based on the “Inspection Mode”. Inspection Mode">

Does the AT OIL TEMP light blink and is DTC P0747 displayed?

Perform the secondary pressure test. Secondary Pressure (Line Pressure) Test">

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

1. OUTLINE OF DIAGNOSIS

• Detect the malfunction of transmission line pressure solenoid and hydraulic circuit (stuck to high pressure side).

• Judge as NG if “Target line pressure − Actual line pressure” becomes the predetermined value or less, while the actual line pressure is equal to or more than the predetermined value.

2. EXECUTION CONDITION

Secondary Parameters	Execution condition
12 V battery system voltage	≥ 10 V
Engine speed	≥ 1000 rpm
Measured line pressure control solenoid valve current	≥ 0.5 A

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
Measured line pressure	> Map1 kPa

Map 1

		Engine speed (rpm)
		0	500	1000	1500	2000	2500	3000
Transmission fluid temperature (degC)	− 40	25600	25600	6231	6302	6341	6375	6404
	− 20	25600	25600	6231	6302	6341	6375	6404
	0	25600	25600	5977	6055	6102	6138	6120
	20	25600	25600	5624	5708	5764	5801	5836
	40	25600	25600	5547	5659	5726	5769	5804
	60	25600	25600	5420	5420	5540	5600	5643
	80	25600	25600	5351	5351	5487	5568	5609
	100	25600	25600	5422	5422	5422	5514	5553
	120	25600	25600	5266	5266	5266	5375	5444
	140	25600	25600	5236	5236	5236	5236	5335

		Engine speed (rpm)
		3500	4000	4500	5000	5500	6000	6500
Transmission fluid temperature (degC)	− 40	6428	6462	6498	6532	6562	6588	6613
	− 20	6428	6462	6498	6532	6562	6588	6613
	0	6147	6184	6224	6260	6288	6314	6338
	20	5867	5905	5950	5988	6013	6041	6062
	40	5838	5878	5920	5956	5983	6008	6036
	60	5678	5718	5755	5785	5816	5836	5880
	80	5646	5680	5718	5745	5785	5816	5859
	100	5596	5635	5677	5711	5743	5780	5817
	120	5489	5522	5564	5600	5639	5682	5685
	140	5381	5408	5451	5489	5535	5585	5552

Time Needed for Diagnosis: 5 seconds

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

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