Click here

AUTOMATIC TRANSMISSION SYSTEM (for 1GR-FE), Diagnostic DTC:P0776

Click here
Click here Click here
DTC Code DTC Name
P0776 Pressure Control Solenoid "B" Performance (Shift Solenoid Valve SL2)
Click here

DESCRIPTION

The ECM uses signals from the output shaft speed sensor and input speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear).

Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems with the shift solenoid valves, valve body or automatic transmission (clutch, brake or gear, etc.).

DTC Code DTC Detection Condition Trouble Area
P0776 The gear required by the ECM does not match the actual gear when driving (2 trip detection logic*1, 1 trip detection logic*2).

  • Shift solenoid valve SL2 remains open

  • Shift solenoid valve SLT remains open or closed

  • Valve body is blocked

  • Automatic transmission (clutch, brake or gear, etc.)

Click here

MONITOR DESCRIPTION

This DTC indicates a stuck ON malfunction of the shift solenoid valve SL2.

The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. When the gear position commanded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores the DTC.

Click here

INSPECTION PROCEDURE


Click here

  1. ACTIVE TEST

    Tip:

    Using the intelligent tester 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. Warm up the engine.

    2. Turn the engine switch off.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the intelligent tester on.

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

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

      Tip:

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

      Comparing the shift position commanded by the Active Test with the actual shift position enables you to confirm the problem (Click here).

      Table 1. 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

      It is possible to check the operation of the shift solenoid valves.

      [Vehicle Condition]

      The vehicle speed is 50 km/h (31 mph) or less.
      Tip:

      • 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 tester.

      • The shift solenoid valve SL2 turns ON/OFF normally when the shift lever is in D.

        ECM gear shift command 1st 2nd 3rd 4th 5th
        Shift solenoid valve SL2 ON ON ON ON OFF
Click here

PROCEDURE


  1. Click here

    CHECK DTC OUTPUT (IN ADDITION TO DTC P0776)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC.

    5. Read the DTCs using the tester.

      Table 2. Result
      Result Proceed to
      Only P0776 is output A
      P0776 and other DTCs are output B
      Tip:

      If any other codes besides P0776 are output, perform troubleshooting for those DTCs first.


  2. Click here

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SHIFT SOLENOID VALVE SLT)

    Note:

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

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

    • Perform the test with the A/C turned off.

    Tip:

    Using the intelligent tester 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. A01560SE01

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

      09992-00095 09992-00231 09992-00271

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine and warm it up.

    4. Measure the line pressure with SST.

    5. Turn the intelligent tester on.

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

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

    8. Measure the line pressure.

      Table 3. Engine and ECT
      Tester Display Test Part Control Range Diagnostic Note
      Activate the Solenoid (SLT)* Operate shift solenoid valve SLT and raise line pressure

      ON or OFF

      Tip:

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

      • ON: No action (normal operation)

      [Vehicle Condition]


      • The vehicle is stopped.

      • The engine is idling.
      Tip:

      *: Activate the Solenoid (SLT) in the Active Test is performed to check the line pressure changes by connecting SST to the automatic transmission, which is used in the Hydraulic Test (Click here) as well. Note that the pressure values in the Active Test and hydraulic test are different.

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

  3. Click here

    INSPECT SHIFT SOLENOID VALVE SL2


    1. A015726E17

      Remove the shift solenoid valve SL2.

    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

  4. Click here

    INSPECT TRANSMISSION VALVE BODY ASSEMBLY


    1. Check the transmission valve body assembly (Click here).

      OK
      There are no foreign objects on any valve.

  5. Click here

    REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLYClick here

  6. Click here

    GO TO DTC CHARTClick here

  7. Click here

    REPLACE SHIFT SOLENOID VALVE SLTClick here

  8. Click here

    REPLACE SHIFT SOLENOID VALVE SL2Click here

  9. Click here

    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLYClick here