Lexus IS250 IS220d GSE20 ALE20 - A960E AUTOMATIC TRANSMISSION
SYSTEM DESCRIPTION
MONITOR DESCRIPTION
INSPECTION PROCEDURE
CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P2714)
PERFORM ACTIVE TEST BY INTELLIGENT TESTER (SHIFT SOLENOID VALVE SLT)
PERFORM RUNNING TEST
INSPECT SHIFT SOLENOID VALVE S1
INSPECT SHIFT SOLENOID VALVE S2
INSPECT SHIFT SOLENOID VALVE S3
INSPECT SHIFT SOLENOID VALVE S4
INSPECT SHIFT SOLENOID VALVE SL2
INSPECT SHIFT SOLENOID VALVE SLT
INSPECT TRANSMISSION VALVE BODY ASSEMBLY
INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY
DTC P2714 Pressure Control Solenoid "D" Performance (Shift Solenoid Valve SLT)
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 ECM adjusts the duty ratio (*) of the SLT solenoid valve to control hydraulic line pressure coming from the primary regulator valve. Appropriate line pressure assures smooth shifting with varying engine outputs.
(*): Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuity in one cycle, and B is the period of non-continuity, then
Duty Ratio=A/(A+B) x 100 (%)
| DTC No. | DTC Detection Condition | Trouble Area |
| P2714 | ECM detects a malfunction on SLT (ON side) according to the revolution difference of the turbine and the 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, S3, S4 or SL2 remains open or closed
Gear 6 incorrect ratio (reverse sequence valve) or 1-2 shift valve is stuck
Valve body is blocked
Automatic transmission (clutch, brake or gear, etc.)
|
MONITOR DESCRIPTION
The ECM calculates the amount of heat absorbed by the friction material based on the difference in revolution (clutch slippage) between the turbine and output shaft. The ECM turns on the MIL and outputs this DTC when the amount of heat absorption exceeds the specified value.
When the shift solenoid valve SLT remains on, oil pressure goes down and clutch engagement force decreases.
- If you continue driving under these conditions, the clutch will burn out and the vehicle will no longer be drivable.
INSPECTION PROCEDURE
| 1.CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P2714) |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) position.
Select the item "Powertrain / ECT / DTC / Current or Pending".
Read the DTCs using the intelligent tester.
- Result:
| Display (DTC output) | Proceed to |
| Only "P2714" is output | A |
| "P2714" and other DTCs | B |
- If any other codes besides "P2714" are output, perform troubleshooting for those DTCs first.
- This test should always be performed with at least 2 people.
- Performing the intelligent tester Active Test allows relay, Vacuum Switching Valve (VSV), actuator and other items to be operated without removing any parts. Performing the Active Test early in troubleshooting is one way to shorten labor time.
- The Data List can be displayed during the Active Test.
Turn the engine switch off.
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) position.
Select the item "Enter / Powertrain / ECT / Active Test ".
Follow the instructions on the tester and read the Active Test.
- While driving, the shift position can be forcibly changed with the intelligent tester.
| Item | Test Details | Diagnostic Note |
| Control the Shift Position | [Test Details]
Operate the shift solenoid valve and set each shift position by yourself.
[Vehicle Condition]
IDL: ON (4th, 5th and 6th)
Less than 50 km/h (31 mph)
[Others]
Press "→" button: Shift up
Press "←" button: Shift down
| Possible to check the operation of the shift solenoid valves. |
This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
The 4th to 5th and 5th to 6th up-shiftings must be performed with the accelerator pedal released.
The 6th to 5th and 5th to 4th down-shiftings 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 (Shift Status) display on the intelligent tester.
Compare the ECM gear shift command and the actual gear position.
- Result:
| ECM gear shift command | 1st | 2nd | 3rd | 4th | 5th | 6th | Proceed to |
| Actuator gear position under malfunction | Shift solenoid S1 | Stuck ON*1
| 2nd | 2nd | 3rd | 4th | 5th | 6th | A |
| Stuck OFF | 1st | 1st | 3rd | 4th | 5th | N*2
|
| Shift solenoid S2 | Stuck ON | 1st | 2nd | 2nd | 4th | 6th | 6th | B |
| Stuck OFF | 3rd | 3rd | 3rd | 4th | 5th | 5th |
| Shift solenoid S3 | Stuck ON | 1st | 2nd | 3rd | 3rd | N*2
| N*2
| C |
| Stuck OFF | 3rd | 4th | 4th | 4th | 5th | 6th |
| Shift solenoid S4 | Stuck ON*3
| 1st | 2nd | 3rd | 4th | 5th | 6th | D |
| Stuck OFF | 1st | 2nd | 3rd | 4th | 4th | 4th |
*1: When shift solenoid S1 is stuck ON, the vehicle cannot drive in reverse
*2: Neutral
*3: When shift solenoid S4 is stuck ON, gear shifting is normal.
| 4.INSPECT SHIFT SOLENOID VALVE S1 |
Remove the shift solenoid valve S1.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Specified Condition
20°C (68°F) |
| Solenoid Connector (S1) - Solenoid Body (S1) | 11 to 15 Ω |
Connect the positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.
- OK:
- The solenoid makes an operating sound.
| NG | |
| |
| REPLACE SHIFT SOLENOID VALVE S1 |
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| 5.INSPECT SHIFT SOLENOID VALVE S2 |
Remove the shift solenoid valve S2.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Specified Condition
20°C (68°F) |
| Solenoid Connector (S2) - Solenoid Body (S2) | 11 to 15 Ω |
Connect the positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.
- OK:
- The solenoid makes an operating sound.
| NG | |
| |
| REPLACE SHIFT SOLENOID VALVE S2 |
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| 6.INSPECT SHIFT SOLENOID VALVE S3 |
Remove the shift solenoid valve S3.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Specified Condition
20°C (68°F) |
| Solenoid Connector (S3) - Solenoid Body (S3) | 11 to 15 Ω |
Connect the positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.
- OK:
- The solenoid makes an operating sound.
| NG | |
| |
| REPLACE SHIFT SOLENOID VALVE S3 |
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| 7.INSPECT SHIFT SOLENOID VALVE S4 |
Remove the shift solenoid valve S4.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Specified Condition
20°C (68°F) |
| Solenoid Connector (S4) - Solenoid Body (S4) | 11 to 15 Ω |
Connect the positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.
- OK:
- The solenoid makes an operating sound.
| NG | |
| |
| REPLACE SHIFT SOLENOID VALVE SL2 |
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| 9.INSPECT SHIFT SOLENOID VALVE SLT |
Remove the shift solenoid valve SLT.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Specified Condition
20°C (68°F) |
| 1 - 2 | 5.0 to 5.6 Ω |
Connect the positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve.
- OK:
- The solenoid makes an operating sound.
| | REPLACE SHIFT SOLENOID VALVE SLT |
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| 10.INSPECT TRANSMISSION VALVE BODY ASSEMBLY |
- OK:
- There are no foreign objects on each valve.
| | REPLACE TRANSMISSION VALVE BODY ASSEMBLY |
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| 11.INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY |
Check the torque converter clutch assembly .
- OK:
- The torque converter clutch operates normally.
| | REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY |
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| OK | |
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| REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY |
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