- Shift solenoid valve SLT remains open or closed
- Valve body is blocked
- Automatic transmission (clutch, brake or gear, etc.)
| Last Modified: 4-30-2014 | 6.6 C | Doc ID: RM000000W8300HX |
| Model Year: 2006 | Model: LX470 | Prod Date Range: [05/2005 - ] |
| Title: A750F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P2714; Pressure Control Solenoid "D" Performance (Shift Solenoid Valve SLT); 2006 MY LX470 [05/2005 - ] | ||
|
DTC |
P2714 |
Pressure Control Solenoid "D" Performance (Shift Solenoid Valve SLT) |
DESCRIPTION
The throttle pressure that is applied to the primary regulator valve (which modulates the line pressure) causes the solenoid valve SLT, under electronic control, to precisely modulate and generate the line pressure according to the extent that the accelerator pedal is depressed or the output of engine power.
This controls the line pressure and provides smooth shifting characteristics.
Upon receiving a signal of the throttle valve opening angle, the ECM controls the line pressure by sending a predetermined duty ratio* to the solenoid valve, modulating the line pressure and generating throttle pressure.
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 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) |
|
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 illuminates 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.
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/ON malfunction |
|
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
ON malfunction
|
The monitor will run whenever this DTC is not present. |
None |
|
Turbine speed sensor (NT) circuit |
Not circuit malfunction |
|
Output speed sensor (NO) circuit |
Not circuit malfunction |
|
ATF temperature sensor circuit |
Not circuit malfunction |
|
Shift solenoid valve S1 circuit |
Not circuit malfunction |
|
Shift solenoid valve S2 circuit |
Not circuit malfunction |
|
Shift solenoid valve SR circuit |
Not circuit malfunction |
|
Shift solenoid valve SL1 circuit |
Not circuit malfunction |
|
Shift solenoid valve SL2 circuit |
Not circuit malfunction |
|
Shift solenoid valve SLT circuit |
Not circuit malfunction |
|
ECT (Engine coolant temperature) sensor circuit |
Not circuit malfunction |
|
KCS sensor circuit |
Not circuit malfunction |
|
ETCS (Electric throttle control system) |
Not system down |
|
Transmission range |
"D" |
|
ECT |
40°C (104°F) or more |
|
Spark advance from Max. retard timing by KCS control |
0°crankshaft angle or more |
|
Engine |
Starting |
|
Transfer range |
"HIGH" * |
|
ATF temperature sensor circuit |
10°C (50°F) or more |
Transfer range "HIGH" * (This condition is applied only 4WD)
|
* Following conditions met |
- |
|
Vehicle speed sensor "A" circuit |
Not circuit malfunction |
|
Output shaft speed sensor circuit |
Not circuit malfunction |
|
Transfer output speed |
143 rpm or more |
|
NO/NOtf (Transfer input speed/Transfer output speed) |
0.9 to 1.1 |
TYPICAL MALFUNCTION THRESHOLDS
|
Summation of C1 clutch heat generations |
Specified valve |
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Performing the intelligent tester's ACTIVE TEST allows relay, VSV, actuator and other items to be operated without removing any parts. Performing the ACTIVE TEST early in troubleshooting is one way to save time.
The DATA LIST can be displayed during the ACTIVE TEST.
- Warm up the engine.
- Turn the ignition switch OFF.
- Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
- Turn the ignition switch ON.
- Turn the intelligent tester ON.
- Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST.
- Follow the instructions on the tester and read the ACTIVE TEST.
|
Item |
Test Details |
Diagnostic Note |
|---|---|---|
|
LINE PRESS UP * |
[Test Details] Operate shift solenoid SLT and raise line pressure [Vehicle Condition]
HINT: OFF: Line pressure up (when Active Test of "LINE PRESS UP" is performed, ECM commands SLT solenoid to turn OFF) ON: No action (normal operation) |
- |
*: "Control the Line Pressure Up" in the ACTIVE TEST is performed to check the line pressure changes by connecting the SST to the automatic transmission, which is used in the HYDRAULIC TEST
![2006 MY LX470 [05/2005 - ]; A750F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: FAIL-SAFE CHART](../../../../stylegraphics/info.gif "2006 MY LX470 [05/2005 - ]; A750F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: FAIL-SAFE CHART")
as well. Please note that the pressure values in the ACTIVE TEST and HYDRAULIC TEST are different.
PROCEDURE
|
1. |
CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P2714) |
(a) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
(b) Turn the ignition switch ON and push the intelligent tester main switch ON.
(c) Enter the following menus: Powertrain / Engine and ECT / DTC / Current or Pending.
(d) Read the DTCs using the intelligent tester.
|
Display (DTC output) |
Proceed to |
|---|---|
|
Only P2714 is output |
A |
|
P2714 and other DTCs |
B |
HINT:
If any other codes besides P2714 are output, perform troubleshooting for those DTCs first.
| B |
|
|
|
2. |
INSPECT SHIFT SOLENOID VALVE SLT |
|
(a) Remove the shift solenoid valve SLT. (b) Measure the resistance of the solenoid valve. Standard resistance: 5.0 to 5.6 Ωat 20°C (68°F) (c) Connect the battery's positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body. OK: Solenoid makes operating noise. |
|
| NG |
|
|
|
3. |
INSPECT TRANSMISSION VALVE BODY ASSEMBLY |
OK:
There are no foreign objects on each valve.
| NG |
|
|
|
4. |
INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY |
OK:
The torque converter clutch operates normally.
| NG |
|
| OK |
|
|
|