AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P2714

DTC Code DTC Name
P2714 Pressure Control Solenoid "D" Performance (Shift Solenoid Valve SLT)

DESCRIPTION

Shift 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 current to shift solenoid valve SLT to control hydraulic line pressure coming from the primary regulator valve. Appropriate line pressure assures smooth shifting with varying engine outputs.

C228973E02

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P2714

Pressure Control Solenoid "D" Performance (Shift Solenoid Valve SLT)

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

  • Shift solenoid valve SLT remains open

  • Shift solenoid valve SL1, SL2, SL3 or SL4 remains open or closed

  • Transmission valve body assembly is blocked

  • Automatic transaxle assembly (clutch, brake or gear, etc.)

Comes on

DTC stored

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 stores this DTC when the amount of heat absorption exceeds the specified value.

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 out and the vehicle will no longer be drivable.

CAUTION / NOTICE / HINT

Note:

Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

Click here

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 / Engine and ECT / Trouble Codes.

      Powertrain > Engine and ECT > Trouble Codes

    5. Read the DTCs using the GTS.

      Result

      Result

      Proceed to

      Only P2714 is output

      A

      P2714 and other DTCs are output

      B
      Tip:

      If shift solenoid valve SLT is stuck on, DTCs for several shift solenoid valves including the malfunctioning shift solenoid valve will be stored.

    A

    INSPECT SHIFT SOLENOID VALVE SLTClick here

    B

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

    Note:

    • Perform the test while the ATF temperature is 50 to 80°C (122 to 176°F).

    • Be careful to prevent the hose of SST from interfering with the exhaust pipe.

    • This check must be conducted after checking and confirming that the engine is normal.

    • Perform the test with the A/C off.

    Tip:

    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. C226143E02

      Remove the test plug from the transaxle case and connect SST.

    2. Connect the GTS to the DLC3.

    3. Start the engine and warm it up.

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

    5. Turn the GTS on.

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

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

    8. Measure the line pressure with SST.

      Powertrain > Engine and ECT > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      Activate the Solenoid (SLT)

      Operate shift solenoid valve SLT and raise line pressure

      ON or OFF

      Tip:

      ON: No action (normal operation)

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

      [Vehicle Condition]

      • Vehicle stopped

      • Engine idling

      Powertrain > Engine and ECT > Active Test

      Tester Display

      Activate the Solenoid (SLT)
      Tip:

      Activate the Solenoid (SLT) in the Active Test is performed to confirm that the line pressure changes. The line pressure changes are confirmed using the same SST that is used for the Hydraulic Test.

      Click here

      Note that the pressure readings for the Active Test and Hydraulic Test are different.

      OK

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

    09992-00095

    09992-00231

    09992-00271

    Result

    Proceed to

    OK

    NG
    NG

    INSPECT SHIFT SOLENOID VALVE SLTClick here

    OK

  3. PERFORM ACTIVE TEST USING GTS (DRIVING 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 / Engine and ECT / Active Test.

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

      Tip:

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

        Click here

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

      Powertrain > Engine and ECT > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      Control the Shift Position

      Operate the shift solenoid valves and set each shift position

      • Press "→" button: Shift up

      • Press "←" button: Shift down

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

      A 10-second interval is required between gear changes.

      Do not down-shift at high speeds. Doing so will damage the automatic transaxle.

      [Vehicle Condition]

      50 km/h (30 mph) or less

      Powertrain > Engine and ECT > Active Test

      Active Test Display

      Control the Shift Position

      Data List Display

      Shift Status
      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.

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

      Tip:

      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)

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

      Result

      System Condition

      ECM Gear Shift Command

      Proceed to

      1st

      2nd

      3rd

      4th

      5th

      6th

      Malfunction

      Shift solenoid valve SL1 Stuck ON

      1st

      2nd

      3rd

      4th

      4th

      4th

      A

      Shift solenoid valve SL1 Stuck OFF

      N*1

      N*1

      N*1

      N*1

      5th

      6th

      Shift solenoid valve SL2 Stuck ON

      4th

      4th

      4th

      4th

      5th

      6th

      B

      Shift solenoid valve SL2 Stuck OFF

      1st

      2nd

      3rd

      1st

      N*1

      N*1

      Shift solenoid valve SL3 Stuck ON

      2nd

      2nd

      3rd

      4th

      5th

      6th

      C

      Shift solenoid valve SL3 Stuck OFF

      1st

      1st

      3rd

      4th

      5th

      N*1

      Shift solenoid valve SL4 Stuck ON*3

      3rd

      3rd

      3rd

      4th

      5th

      5th

      D

      Shift solenoid valve SL4 Stuck OFF

      1st

      2nd

      1st

      4th

      N*1

      6th

      Shift solenoid valve SLT Stuck ON

      N*2

      N*2

      N*2

      N*2

      N*2

      N*2

      E

      Shift solenoid valve SLT Stuck OFF*3

      1st

      2nd

      3rd

      4th

      5th

      6th
      Tip:

      • *1: Neutral

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

      • *3: When shift solenoid valve SLT is stuck off, gear shifting is normal.

    A

    GO TO DTC P0746

    Click here

    B

    GO TO DTC P0776

    Click here

    C

    GO TO DTC P0796

    Click here

    D

    GO TO DTC P2808

    Click here

    E

  4. INSPECT SHIFT SOLENOID VALVE SLT

    1. C197715C14

      *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. 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 1

      • Battery negative (-) → Terminal 2

      Valve moves and makes an operating noise

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE SHIFT SOLENOID VALVE SLT

    Click here

    OK

  5. INSPECT TRANSMISSION VALVE BODY ASSEMBLY

    1. Check the transmission valve body assembly.

      Click here

      OK

      There are no foreign objects on any valve.

    Result

    Proceed to

    OK

    NG
    OK

    REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

    Click hereClick here