Dtc P0766 Shift Solenoid D Performance (Shift Solenoid Valve S4)

Transmission. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
U140F Automatic Transaxle. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

SYSTEM DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0766)

INSPECT SHIFT SOLENOID VALVE S4

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY

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


SYSTEM 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 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, gear, etc.).

DTC No.
DTC Detection Condition
Trouble Area
P0766
Gear required by the ECM does not match the actual gear when driving (2 trip detection logic)
  1. Shift solenoid valve S4 remains open or closed
  2. Valve body is blocked
  3. Shift solenoid valve S4
  4. Automatic transaxle (clutch, brake, gear, etc.)
  5. ECM

MONITOR DESCRIPTION

This DTC indicates a stuck OFF malfunction of the shift solenoid valve S4, stuck ON malfunction of the 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

HINT:
Performing the intelligent tester's Active Test allows relay, VSV, actuator and other items to be operated without removing any parts. Performing the Active Test early in troubleshooting is one way to save time.
The Data List can be displayed during the Active Test.
  1. Warm up the engine.
  2. Turn the ignition switch off.
  3. Connect the intelligent tester to the DLC3.
  4. Turn the ignition switch on (IG) and turn the tester ON.
  5. Enter the following menus: Powertrain / Engine and ECT / Active Test.
  6. Follow the instructions on the tester and perform the Active Test.
HINT:
While driving, the shift position can be forcibly changed with the tester.
Comparing the shift position commanded by the Active Test with the actual shift position enables you to confirm the problem (RAV4_ACA30 RM000000O8L0BCX.html).

Item
Test Details
Diagnostic Note
Control the shift position
[Test Details]
Operate the shift solenoid valve and set each shift lever position by yourself
[Vehicle Condition]
  1. IDL: ON
  2. 50 km/h (31 mph) or less
[Other information]
  1. Press "→" button: Shift up
  2. Press "←" button: Shift down
Possible to check the operation of the shift solenoid valves
HINT:
  1. This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
  2. The shift position commanded by the ECM is shown in the Data List/ (shift status) display on the tester.
1.CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0766)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC / Current or Pending.

  1. Read the DTCs using the tester.

    Result:
    Display (DTC output)
    		Proceed to
    Only P0766 is output
    		A
    P0766 and other DTCs are output
    		B
    HINT:
    If any other codes besides P0766 are output, perform troubleshooting for those DTCs first.


B
GO TO DTC CHART
A


2.INSPECT SHIFT SOLENOID VALVE S4


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.U140F Automatic Transaxle.Automatic Transaxle System. Dtc P0766 Shift Solenoid D Performance (Shift Solenoid Valve S4)

  1. Remove the shift solenoid valve S4.

  1. Measure the resistance between the solenoid valve terminal and solenoid valve body.

    Standard resistance:
    11 to 15 Ω at 20°C (68°F)

  1. Connect the battery's positive (+) lead to the terminal of the solenoid valve connector, and the negative (-) lead to the solenoid body. Then check that the valve moves and makes an operating noise.

    OK:
    Valve moves and makes operating noise.


NG
REPLACE SHIFT SOLENOID VALVE S4
OK


3.INSPECT TRANSMISSION VALVE BODY ASSEMBLY

  1. Check the transmission valve body assembly.

    OK:
    There are no foreign objects on each valve.


NG
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY
OK


4.INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY

  1. Check the torque converter clutch assembly (RAV4_ACA30 RM000001GS000VX.html).

    OK:
    The torque converter clutch operates normally.


NG
REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY
OK

REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY