СИСТЕМА АВТОМАТИЧЕСКОЙ ТРАНСМИССИИ, Diagnostic DTC:P0776

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

SYSTEM DESCRIPTION

The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd or 4th (O/D) gear).

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

DTC No. DTC Detection Condition Trouble Area
P0776 The gear required by the ECM does not match the actual gear when driving (2-trip detection logic)

  • Shift solenoid valve SL2 remains open or closed

  • Valve body is blocked

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

MONITOR DESCRIPTION

The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual gear position (1st, 2nd, 3rd or 4th (O/D) gear position). 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.

INSPECTION PROCEDURE

Tech Tips

Using the Intelligent tester to perform Active Test 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 Test early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Test.


  1. PERFORM ACTIVE TEST


    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 on the Intelligent tester.

    6. Select the item "Enter / Powertrain / Engine and ECT / Active Test / Shift Status".

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

      Tech Tips

      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.

      Tester Display Test Part Control Range Diagnostic Note
      Control the Shift Position

      [Test Details]

      Operate the shift solenoid valve and set each shift position by yourself.

      [Vehicle Condition]


      • IDL: ON

      • Less than 50 km/h (31 mph)

      [Others]


      • Press "→" button: Shift up

      • Press "←" button: Shift down

      		 1st / 2nd / 3rd / 4th Possible to check the operation of the shift solenoid valves.

      Tech Tips


      • This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.

      • The shift position commanded by the ECM is shown in the Data List / Shift Status display on the Intelligent tester.

PROCEDURE


  1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0776)


    1. Connect the Intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the Intelligent tester main switch on.

    3. Select the item "Enter / Powertrain / Engine and ECT / Trouble Codes".

    4. Read the DTCs using the Intelligent tester.

      Result
      Display (DTC output) Proceed to
      Only "P0776" is output A
      "P0776" and other DTCs B

      Tech Tips

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


    B

    GO TO DTC CHART Click here

    A

  2. INSPECT SHIFT SOLENOID VALVE SL2


    1. A01CG61E27

      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. 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.

    NG

    REPLACE SHIFT SOLENOID VALVE SL2 Click here

    OK

  3. INSPECT TRANSMISSION VALVE BODY ASSEMBLY

    OK
    There are no foreign objects on each valve and they operate smoothly.

    NG

    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY Click here

    OK

  4. INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY

    OK
    The torque converter clutch operates normally.

    NG

    REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY

    OK

    REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY Click here