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AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P0766

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

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

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INSPECTION PROCEDURE

Tip:

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.


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  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".

      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).

      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.
      Tip:

      • 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.

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PROCEDURE


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    CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0766)


    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 "P0766" is output A
      "P0766" and other DTCs B
      Tip:

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


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    INSPECT SHIFT SOLENOID VALVE S4


    1. A01CBQPE01

      Remove the shift solenoid valve S4.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      Solenoid Connector (S4) - Solenoid Body (S4) 20°C (68°F) 11 to 15 Ω

    3. Connect the positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.

      OK
      The solenoid makes an operating sound.

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    INSPECT TRANSMISSION VALVE BODY ASSEMBLY

    OK
    There are no foreign objects on each valve.

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    INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY

    OK
    The torque converter clutch operates normally.

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    REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLYClick here

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    GO TO DTC CHARTClick here

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    REPLACE SHIFT SOLENOID VALVE S4Click here

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    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLYClick here

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    REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY