Toyota Venza: Pressure Control Solenoid "D" Performance (Shift Solenoid Valve SLT) (P2714)

Toyota Venza Service Manual / U660e Automatic Transmission / Transaxle / Automatic Transaxle System / Pressure Control Solenoid "D" Performance (Shift Solenoid Valve SLT) (P2714)

SYSTEM DESCRIPTION

The linear solenoid valve (SLT) controls the transmission line pressure for smooth transmission operation based on signals from the throttle position sensor and the vehicle speed sensor. The TCM adjusts the current to SLT solenoid valve to control hydraulic line pressure coming from the primary regulator valve. Appropriate line pressure assures smooth shifting with varying engine outputs.

DTC No.	DTC Detection Condition	Trouble Area
P2714	The ECM detects a malfunction in the shift solenoid valve SLT (ON side) according to the difference in the speed between the turbine and the output shaft, and also by the transmission fluid pressure. (2-trip detection logic)	Shift solenoid valve SLT remains open Shift solenoid valve SL1, SL2, SL3 or SL4 remains open or closed Valve body is blocked Automatic transaxle (clutch, brake or gear, etc.)

MONITOR DESCRIPTION

The TCM calculates the amount of clutch slip based on the turbine speed, output shaft speed, and gear ratio. If the amount of clutch slip exceeds a specified level, the TCM will set this DTC and illuminate the MIL.

When shift solenoid valve SLT remains on, the line pressure goes down and clutch engagement force decreases.

NOTICE:

If driving continues under these conditions, clutches will burn out and the vehicle will no longer be drivable.

MONITOR STRATEGY

Related DTCs	P2714: Shift solenoid valve SLT/ON malfunction
Required sensors/Components	Shift solenoid valve SLT
Frequency of operation	Continuous
Duration	2 sec.
MIL operation	2 driving cycles
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

ON malfunction:

The monitor will run whenever this DTC is not present. (Not circuit malfunction)	P0712, P0713 (ATF temperature sensor circuit (TFT sensor)) P0115, P0117, P0118 (ECT sensor circuit) P0715, P0717 (Turbine speed sensor circuit) P0791, P0793 (Intermediate shaft speed sensor circuit) P0748 (Shift solenoid valve SL1 circuit) P0778 (Shift solenoid valve SL2 circuit) P0798 (Shift solenoid valve SL3 circuit) P2810 (Shift solenoid valve SL4 circuit) P2716 (Shift solenoid valve SLT circuit) P0327, P0328, P0332, P0333 (KCS sensor circuit) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P060A, P060B, P060D, P060E, P0657, P1607, P2102, P2103, P2111, P2112, P2118, P2119, P2135 ((ETCS) Electronic throttle control system) U0100 (CAN communication system)
Transmission range	"D"
TFT (Transmission fluid temperature)	-10°C (14°F) or more
TFT (Transmission fluid temperature) sensor circuit	No circuit malfunction
ECT (Engine coolant temperature) sensor circuit	No circuit malfunction
Turbine speed sensor circuit	No circuit malfunction
Intermediate shaft speed sensor circuit	No circuit malfunction
Shift solenoid valve SL1 circuit	No circuit malfunction
Shift solenoid valve SL2 circuit	No circuit malfunction
Shift solenoid valve SL3 circuit	No circuit malfunction
Shift solenoid valve SL4 circuit	No circuit malfunction
Shift solenoid valve SLT circuit	No circuit malfunction
(KCS) Knock control sensor circuit	No circuit malfunction
(ETCS) Electronic throttle control system	Not system down
CAN communication system	Not system down
Engine	Starting
Input turbine torque	100 N*m or more
Turbine speed	250 rpm or more
Output speed	250 rpm or more

TYPICAL MALFUNCTION THRESHOLDS

ON malfunction:

Detection criteria	Threshold
Turbine speed - Output speed x Gear ratio at output speed 1,000 rpm (Condition varies with output speed)	75 rpm or more

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs (See page ).

PROCEDURE

1.	CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P2714)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Powertrain / ECT / Trouble Codes.

(e) Read the DTCs using the Techstream.

Display (DTC Output)	Proceed to
Only "P2714" is output	A
"P2714" and other DTCs are output	B

HINT:

If a solenoid is stuck ON, DTCs for several solenoids including the malfunctioning solenoid will be detected.

GO TO STEP 4

2.	PERFORM ACTIVE TEST USING TECHSTREAM (SHIFT SOLENOID VALVE SLT)

NOTICE:

Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C (122 to 176°F)
Be sure to prevent SST hose from interfering with the exhaust pipe.
This check must be conducted after checking and adjusting the engine.
Perform the test with the A/C OFF.

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Turn the ignition switch off.

(b) Lift the vehicle up.

SST: 09992-00095

09992-00231

09992-00271

(d) Lower the vehicle.

(e) Fully apply the parking brake and chock the 4 wheels.

(f) Connect the Techstream to the DLC3.

(g) Start the engine.

(h) Warm up the Automatic Transmission Fluid (ATF).

(i) Measure the line pressure when the engine is idling.

(j) Turn the Techstream on.

(k) Enter the following menus: Powertrain / ECT / Active Test.

(l) Follow the instructions on the Techstream and perform the Active Test.

(m) Measure the line pressure with SST.

Item	Test Details
Activate the Solenoid (SLT)*	[Test Details] Operates shift solenoid SLT to raise the line pressure. [Vehicle Condition] Vehicle Stopped IDL: ON HINT: ON: No action (normal operation) OFF: Line pressure up (When the Active Test of "Activate the Solenoid (SLT)" is performed, the ECM commands the SLT solenoid to turn off).

Item

Test Details

Activate the Solenoid (SLT)*

[Test Details]

Operates shift solenoid SLT to raise the line pressure.

[Vehicle Condition]

Vehicle Stopped
IDL: ON

HINT:

ON: No action (normal operation)

OFF: Line pressure up (When the Active Test of "Activate the Solenoid (SLT)" is performed, the ECM commands the SLT solenoid to turn off).

*: "Activate the Solenoid (SLT)" in the Active Test is performed to check that the line pressure changes by connecting the SST to the automatic transaxle. The same SST is used in the Hydraulic Test (See page ) as well.

HINT:

The pressure values in Active Test and Hydraulic Test are different from each other.

OK:

The line pressure changes as specified when performing the Active Test.

GO TO STEP 4

3.	PERFORM ACTIVE TEST USING TECHSTREAM (SHIFTING TEST)

NOTICE:

This test should always be performed with at least 2 people.

(a) Warm up the engine.

(b) Turn the ignition switch off.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / ECT / Active Test.

(g) According to the display on the Techstream, perform the Active Test.

HINT:

Comparing the gear commanded by the Active Test with the actual gear enables confirmation of the problem (See page ).

Item	Test Details	Diagnostic Note
Control the Shift Position	[Test Details] Operates the shift solenoid valves to allow gears to selected manually. [Others] Press "→" button: Upshift occurs Press "←" button: Downshift occurs	Can be used to check the operation of the shift solenoid valves.

Item

Test Details

Diagnostic Note

Control the Shift Position

[Test Details]

Operates the shift solenoid valves to allow gears to selected manually.

[Others]

Press "→" button: Upshift occurs
Press "←" button: Downshift occurs

Can be used to check the operation of the shift solenoid valves.

NOTICE:

This test can be conducted when the vehicle is stopped.
When shifting gears using the Active Test function, do not operate the accelerator pedal for 2 seconds before and after shifting gears.

HINT:

The gear commanded by the TCM is shown in the Data List / Shift Status display on the Techstream.

(h) Check the vehicle speed and the gear when the engine speed is 1000 rpm.

HINT:

Because the torque converter has not engaged, it may be difficult to obtain the speeds specified in 4th, 5th, and 6th gear, however a difference of speed should still be evident following each gear change.

Standard:

1st	2nd	3rd	4th	5th	6th
8 to 12 km/h (5 to 7.5 mph)	15 to 19 km/h (9.3 to 11.8 mph)	21 to 25 km/h (13.0 to 15.5 mph)	31 to 35 km/h (19.3 to 21.7 mph)	44 to 48 km/h (27.3 to 29.8 mph)	52 to 56 km/h (32.3 to 34.8 mph)

(i) Compare the TCM commanded gear and the actual gear.

Actuator Gear during Malfunction		TCM Commanded Gear						Proceed to
Actuator Gear during Malfunction		1st	2nd	3rd	4th	5th	6th	Proceed to
Shift solenoid SL1	Stuck ON	1st	2nd	3rd	4th	4th	4th	A
Shift solenoid SL1	Stuck OFF	N*1	N*1	N*1	N*1	5th	6th	A
Shift solenoid SL2	Stuck ON	4th	4th	4th	4th	5th	6th	B
Shift solenoid SL2	Stuck OFF	1st	2nd	3rd	1st	N*1	N*1	B
Shift solenoid SL3	Stuck ON	2nd	2nd	3rd	4th	5th	6th	C
Shift solenoid SL3	Stuck OFF	1st	1st	3rd	4th	5th	N*1	C
Shift solenoid SL4	Stuck ON*3	3rd	3rd	3rd	4th	5th	5th	D
Shift solenoid SL4	Stuck OFF	1st	2nd	1st	4th	N*1	6th	D
Shift solenoid SLT	Stuck ON	N*2	N*2	N*2	N*2	N*2	N*2	E
Shift solenoid SLT	Stuck OFF*3	1st	2nd	3rd	4th	5th	6th	E

HINT:

*1: Neutral
*2: If shift solenoid SLT is stuck on, the line pressure will be low. Therefore, the amount of torque that can be transmitted by each gear is lower than the normal limit. When the engine power exceeds this lowered limit, the engine speed will increase freely.
*3: When shift solenoid SLT is stuck off, gear shifting is normal.

GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE (SL1) PERFORMANCE DTC P0746)

GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE (SL2) PERFORMANCE DTC P0776)

GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE (SL3) PERFORMANCE DTC P0796)

GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE (SL4) PERFORMANCE DTC P2808)

4.	INSPECT SHIFT SOLENOID VALVE SLT

(a) Remove shift solenoid valve SLT.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	20°C (68°F)	5.0 to 5.6 Ω

Text in Illustration

*1	Shift Solenoid Valve SLT

(c) Connect a battery positive (+) lead with a 21 W bulb to terminal 2 and a negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating sound.

OK:

Valve moves and makes an operating sound.

REPLACE SHIFT SOLENOID VALVE SLT

5.	INSPECT TRANSMISSION VALVE BODY ASSEMBLY

(a) Check the transmission valve body assembly (See page ).

OK:

There are no foreign objects on each valve and they operate smoothly.

REPLACE AUTOMATIC TRANSMISSION ASSEMBLY

REPLACE TRANSMISSION VALVE BODY ASSEMBLY

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