AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P2714

DTC Code DTC Name
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 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. Detection Item DTC Detection Condition Trouble Area MIL Memory
P2714 Pressure Control Solenoid "D" Performance (Shift Solenoid Valve SLT) The TCM 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, gear, etc.)

 Comes on DTC stored

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.

Note

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

PROCEDURE


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


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / ECT / Trouble Codes.


      Powertrain > ECT > Trouble Codes

    5. Read the DTCs using the GTS.

      Result
      Result Proceed to
      Only DTC P2714 is output A
      P2714 and other DTCs are output B

      Tech Tips

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


    B

    PERFORM ACTIVE TEST USING GTS (SHIFT SOLENOID VALVE SLT) Click here

    A

  2. INSPECT SHIFT SOLENOID VALVE SLT


    1. A0029G2C02
      *1 Shift Solenoid Valve SLT

      Remove shift solenoid valve SLT.

    2. 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

    3. 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.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SHIFT SOLENOID VALVE SLT Click here

    OK

  3. INSPECT TRANSMISSION VALVE BODY ASSEMBLY


    1. Check the transmission valve body assembly.

      Click here

      OK
      There is no foreign matter on each valve and they operate smoothly.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AUTOMATIC TRANSAXLE ASSEMBLY Click here

    NG

    REPLACE TRANSMISSION VALVE BODY ASSEMBLY Click here

  4. PERFORM ACTIVE TEST USING GTS (SHIFT SOLENOID VALVE SLT)

    Note


    • Perform a test at the normal operating Automatic Transmission Fluid (ATF) temperature: 50 to 80°C (122 to 176°F)

    • Be careful to prevent the SST hose from contacting the exhaust pipe.

    • This check must be conducted after checking and adjusting the engine.

    • Perform the test with the air conditioning off.

    Tech Tips

    Using the GTS 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.


    1. Turn the ignition switch off.

    2. Lift the vehicle up.

    3. A002AH9E02

      Remove the test plug on the transmission case center right side and connect SST.

      SST
      09992-00095   ( 09992-00231, 09992-00271 )

    4. Lower the vehicle.

    5. Fully apply the parking brake and chock all 4 wheels.

    6. Connect the GTS to the DLC3.

    7. Start the engine.

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

    9. Measure the line pressure when the engine is idling.

    10. Turn the GTS on.

    11. Enter the following menus: Powertrain / ECT / Active Test.

    12. Follow the instructions on the GTS and perform the Active Test.

    13. Measure the line pressure with SST.


      Powertrain > ECT > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Activate the Solenoid (SLT) Operates shift solenoid SLT to raise the line pressure.

      ON/OFF

      Tech Tips

      ON: No action (normal operation)

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

      [Vehicle Condition]


      • Vehicle Stopped

      • IDL: ON

      Powertrain > ECT > Active Test
      Tester Display
      Activate the Solenoid (SLT)

      • "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 as well.

        Click here

      Tech Tips

      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.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 2 Click here

    OK

  5. PERFORM ACTIVE TEST USING GTS (SHIFTING TEST)

    Note

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


    1. Warm up the engine.

    2. Turn the ignition switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

    6. Enter the following menus: Powertrain / ECT / Active Test.

    7. According to the display on the GTS, perform the Active Test.

      Tech Tips

      Comparing the gear commanded by the Active Test with the actual gear enables confirmation of the problem.

      Click here


      Powertrain > ECT > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Control the Shift Position Operates the shift solenoid valves to allow gears to selected manually.

      • Press "→" button: Upshift occurs

      • Press "←" button: Downshift occurs

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

      Upshifts and downshifts should be performed consecutively. A 10-second interval is required between gear changes.

      Do not downshift at high speeds. Doing so will damage the automatic transaxle.

      [Vehicle Condition]

      50 km/h (30 mph) or less

      Powertrain > ECT > Active Test
      Tester Display
      Control the Shift Position

      Note


      • 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.

      Tech Tips

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

    8. Check the vehicle speed and the gear when the engine speed is 1000 rpm.

      Tech Tips

      Because the torque converter clutch 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)

    9. Compare the TCM commanded gear and the actual gear.

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

      Tech Tips


      • *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.


    A

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

    B

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

    C

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

    D

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

    E

    GO TO STEP 2 Click here