СИСТЕМА АВТОМАТИЧЕСКОЙ ТРАНСМИССИИ (для моделей с 3ZR-FE), Diagnostic DTC:P0766

DTC Code DTC Name
P0766 Shift Solenoid "D" Performance (Shift Solenoid Valve S4)

DESCRIPTION

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

DTC Code DTC Detection Condition Trouble Area
P0766 The gear required by the ECM does not match the actual gear when driving (2 trip detection logic).

  • Shift solenoid valve S4 remains open or closed

  • Valve body is blocked

  • Shift solenoid valve S4

  • Torque converter clutch

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

MONITOR DESCRIPTION

This DTC indicates a stuck OFF malfunction of shift solenoid valve S4, stuck ON malfunction of shift solenoid valve SL2, or brake control valve malfunction. 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.

INSPECTION PROCEDURE

  1. ACTIVE TEST

    Tech Tips

    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 ignition switch off.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to ON.

    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.

      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 confirmation of the problem Click here.

      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.

      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 tester.

PROCEDURE

  1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0766)

    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

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

    5. Read the DTCs using the tester.

      Result
      Result Proceed to
      Only P0766 is output A
      P0766 and other DTCs are output B

      Tech Tips

      If any other codes besides P0766 are output, perform troubleshooting for those DTCs first.

    B

    GO TO DTC CHART Click here

    A

  2. INSPECT SHIFT SOLENOID VALVE S4

    1. Remove shift solenoid valve S4.

      A005RNRE01

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Shift solenoid valve S4 connector terminal - Shift solenoid valve S4 body 20°C (68°F) 11 to 15 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 (+) → Shift solenoid valve S4 connector

      • Battery negative (-) → Shift solenoid valve S4 body

      		 Valve moves and makes an operating noise
      Text in Illustration
      *1

      Component without harness connected

      (Shift Solenoid Valve S4)
    NG

    REPLACE SHIFT SOLENOID VALVE S4 Click here

    OK

  3. INSPECT TRANSMISSION VALVE BODY ASSEMBLY

    1. Check the transmission valve body assembly Click here.

      OK
      There are no foreign objects on any valve.
    NG

    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY Click here

    OK

  4. INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY

    1. Check the torque converter clutch assembly Click here.

      OK
      The torque converter clutch operates normally.
    NG

    REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY Click here

    OK

    REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY Click here