Toyota 4Runner manuals

Toyota 4Runner: Pressure Control Solenoid "D" Performance (Shift Solenoid Valve SLT) (P2714)

Toyota 4Runner Service Manual / Drivetrain / A750e Automatic Transmission / Transaxle / Automatic Transmission System / Pressure Control Solenoid "D" Performance (Shift Solenoid Valve SLT) (P2714)

DESCRIPTION


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

HINT:

*: The duty ratio is the ratio of the current ON time (A) to the total of the current ON and OFF time (A + B).

Duty Ratio (%) = A / (A + B) x 100

DTC Code

DTC Detection Condition

Trouble Area

P2714

The ECM detects a malfunction of SLT (ON side) according to the difference in speed between the turbine and output shaft, and also by the oil pressure (2-trip detection logic).

  • Shift solenoid valve SLT remains open or closed
  • Shift solenoid valve S1, S2, SR, SL1 or SL2 remains open or closed
  • 1-2 shift valve is stuck
  • Valve body is blocked
  • Torque converter assembly
  • Automatic transmission (clutch, brake, gear, etc.)

MONITOR DESCRIPTION

The ECM calculates the amount of heat absorbed by the friction material based on the difference in speed (clutch slippage) between the turbine and output shaft. The ECM turns on the MIL and outputs the DTC when the amount of heat absorption exceeds the specified value.

There are two reasons that make the speed different.

  • When the shift solenoid valve SLT remains on, oil pressure goes down and clutch engagement force decreases.
  • When the shift solenoid valve remains on or off, the gear position commanded by the ECM and the actual gear position are not the same.

NOTICE:

If you continue driving under these conditions, the clutch will burn out and the vehicle will no longer be drivable.

MONITOR STRATEGY

Related DTCs

P2714: Shift solenoid valve SLT/Functional check

Required sensors/Components

Shift solenoid valve SLT, Valve body, ATF temperature sensor, Speed sensor (NT), Speed sensor (NO)

Frequency of operation

Continuous

Duration

Immediate

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

The monitor will run whenever the following DTCs are not stored

P0717 (Turbine speed sensor circuit)

P0722 (Output speed sensor circuit)

P0712, P0713, P2740, P2742, P2743 (ATF temperature sensor "A" circuit)

P0973, P0974 (Shift solenoid valve S1 circuit)

P0976, P0977 (Shift solenoid valve S2 circuit)

P0985, P0986 (Shift solenoid valve SR circuit)

P0748 (Shift solenoid valve SL1 circuit)

P0778 (Shift solenoid valve SL2 circuit)

P2716 (Shift solenoid valve SLT circuit)

P0128 (ECT (Engine Coolant Temperature) sensor circuit)

P0327, P0328, P0332, P0333 (KCS sensor circuit)

ETCS (Electric Throttle Control System)

Not system down

Transmission position

"D"

Duration time from shifting "N" to "D"

4 sec. or more

ECT

40°C (104°F) or higher

Spark advance from max. retard timing by KCS control

0° crankshaft angle or more

Engine

Starting

TYPICAL MALFUNCTION THRESHOLDS

One of the following conditions is met: ON malfunction (A), (B), (C), (D), (E), (F) or (G)

ON Malfunction (A)

Summation of C1 clutch heat generations

Specified value

ON Malfunction (B)

Shift solenoid valve S1 ON malfunction

Detected

ON Malfunction (C)

Shift solenoid valve S2 ON malfunction

Detected

ON Malfunction (D)

Shift solenoid valve SR OFF malfunction

Detected

ON Malfunction (E)

1-2 shift valve malfunction

Detected

ON Malfunction (F)

Shift solenoid valve SL1 OFF malfunction

Detected

ON Malfunction (G)

Shift solenoid valve SL2 ON malfunction

Detected

CAUTION / NOTICE / HINT

NOTICE:

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


PROCEDURE

1.

CHECK DTC OUTPUT (IN ADDITION TO DTC P2714)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) Read the DTCs using the Techstream.

Result

Result

Proceed to

Only P2714 is output

A

P2714 and other DTCs are output

B

HINT:

If any other codes besides P2714 are output, perform troubleshooting for those DTCs first.


B

GO TO DTC CHART

A

2.

PERFORM ACTIVE TEST USING TECHSTREAM (SHIFT SOLENOID VALVE SLT)



NG

GO TO STEP 7

OK

3.

PERFORM ACTIVE TEST USING TECHSTREAM (RUNNING TEST)

CAUTION:

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

NOTICE:

  • Perform the test at the normal operating ATF temperature: 50 to 80°C (122 to 176°F).
  • Perform the test with the A/C turned 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) Connect the Techstream to the DLC3.

(b) Clear the DTCs (See page ).


(c) Warm up the engine.

(d) Enter the following menus: Powertrain / Engine and ECT / Active Test.

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

HINT:

While driving, the shift position can be forcibly changed with the Techstream.

Engine and ECT

Tester Display

Test Part

Control Range

Diagnostic Note

Control the Shift Position

Operate shift solenoid valve and set each shift position

  • Press "→" button: Shift up
  • Press "←" button: Shift down

Possible to check operation of the shift solenoid valves.

[Vehicle Condition]

50 km/h (31 mph) or less.

HINT:

  • This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
  • The 4th to 5th up-shift must be performed with the accelerator pedal released.
  • The 5th to 4th down-shift must be performed with the accelerator pedal released.
  • Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.
  • The shift position commanded by the ECM is shown in the Data List display on the Techstream.

(f) Compare the ECM gear shift command and the actual gear position.

OK:

Gear position changes in accordance with the Techstream command.

Result

System Condition

ECM Gear Shift Command

Proceed to

1st

2nd

3rd

4th

5th

Malfunction

Shift solenoid S1

Stuck ON

1st

2nd

2nd

1st

N*1

A

Stuck OFF

4th

3rd

3rd

4th

5th

Shift solenoid S2

Stuck ON*2

2nd

2nd

3rd

3rd

N*1

B

Stuck OFF*3

1st

1st

4th

4th

5th

Shift solenoid SL2

Stuck ON

1st

2nd

3rd

4th

N*1

C

Stuck OFF

1st

2nd

3rd

4th

5th

Shift solenoid SR

Stuck ON*4

1st

2nd

3rd

4th

5th

D

Stuck OFF*5

1st

2nd

3rd

4th

4th

Normal

1st

2nd

3rd

4th

5th

E

HINT:

  • *1: Neutral
  • *2: When shift solenoid S2 is stuck ON, the vehicle cannot drive in reverse.
  • *3: When shift solenoid S2 is stuck OFF, the 4th to 5th up-shift will have a large shift shock. Also, the 5th to 4th down-shift will have time lag.
  • *4: Stuck ON condition can be determined by checking if shift shock has increased excessively.
  • *5: When shift solenoid SR is stuck OFF, moving the shift lever from N to D will cause a large shift shock.
  • Gear shifts can be determined by paying attention to changes in rpm.

B

GO TO STEP 10


C

GO TO STEP 13


D

GO TO STEP 16


E

GO TO STEP 20

A

4.

INSPECT SHIFT SOLENOID VALVE S1



NG

REPLACE SHIFT SOLENOID VALVE S1

OK

5.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY



NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

6.

INSPECT TORQUE CONVERTER ASSEMBLY

(a) Check the torque converter assembly (See page ).


OK:

The torque converter operates normally.


OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY


NG

REPLACE TORQUE CONVERTER ASSEMBLY

7.

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

(c) Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.

OK:

Measurement Condition

Specified Condition

  • Battery positive (+) with a 21 W bulb → Terminal 2
  • Battery negative (-) → Terminal 1

Valve moves and makes operating noise

Text in Illustration

*a

Component without harness connected

(Shift Solenoid Valve SLT)


NG

REPLACE SHIFT SOLENOID VALVE SLT

OK

8.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY



NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

9.

INSPECT TORQUE CONVERTER ASSEMBLY

(a) Check the torque converter assembly (See page ).


OK:

The torque converter operates normally.


OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY


NG

REPLACE TORQUE CONVERTER ASSEMBLY

10.

INSPECT SHIFT SOLENOID VALVE S2



NG

REPLACE SHIFT SOLENOID VALVE S2

OK

11.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY



NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

12.

INSPECT TORQUE CONVERTER ASSEMBLY

(a) Check the torque converter assembly (See page ).


OK:

The torque converter operates normally.


OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY


NG

REPLACE TORQUE CONVERTER ASSEMBLY

13.

INSPECT SHIFT SOLENOID VALVE SL2



NG

REPLACE SHIFT SOLENOID VALVE SL2

OK

14.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY



NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

15.

INSPECT TORQUE CONVERTER ASSEMBLY

(a) Check the torque converter assembly (See page ).


OK:

The torque converter operates normally.


OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY


NG

REPLACE TORQUE CONVERTER ASSEMBLY

16.

INSPECT SHIFT SOLENOID VALVE SR



NG

REPLACE SHIFT SOLENOID VALVE SR

OK

17.

INSPECT SHIFT SOLENOID VALVE SL1



NG

REPLACE SHIFT SOLENOID VALVE SL1

OK

18.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY



NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

19.

INSPECT TORQUE CONVERTER ASSEMBLY

(a) Check the torque converter assembly (See page ).


OK:

The torque converter operates normally.


OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY


NG

REPLACE TORQUE CONVERTER ASSEMBLY

20.

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

(c) Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.

OK:

Measurement Condition

Specified Condition

  • Battery positive (+) with a 21 W bulb → Terminal 2
  • Battery negative (-) → Terminal 1

Valve moves and makes operating noise

Text in Illustration

*a

Component without harness connected

(Shift Solenoid Valve SLT)


NG

REPLACE SHIFT SOLENOID VALVE SLT

OK

21.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY



NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

22.

INSPECT TORQUE CONVERTER ASSEMBLY

(a) Check the torque converter assembly (See page ).


OK:

The torque converter operates normally.


OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY


NG

REPLACE TORQUE CONVERTER ASSEMBLY

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