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

Transmission. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
U241E Automatic Transaxle. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

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)


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 with 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).
  1. Shift solenoid valve S4 remains open or closed
  2. Valve body is blocked
  3. Shift solenoid valve S4
  4. Torque converter clutch
  5. Automatic transaxle (clutch, brake, gear, etc.)

MONITOR DESCRIPTION

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


ACTIVE TEST
HINT:
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 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.

    HINT:
    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.

    Engine and ECT
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Control the Shift Position
    		Operate shift solenoid valves and set each shift position
    1. Press "→" button: Shift up
    2. 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.
    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).

  1. Turn the intelligent tester on.

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

  1. Read the DTCs using the tester.

    Result
    Result
    		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.U241E Automatic Transaxle.Automatic Transaxle System. Dtc P0766 Shift Solenoid D Performance (Shift Solenoid Valve S4)

  1. Remove shift solenoid valve S4.

  1. 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

  1. 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
    1. Battery positive (+) → Shift solenoid valve S4 connector
    2. Battery negative (-) → Shift solenoid valve S4 body
    		Valve moves and makes an operating noise
Text in Illustration
*a
Component without harness connected
(Shift Solenoid Valve S4)


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 any valve.


NG
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY
OK


4.INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY

  1. Check the torque converter clutch assembly.

    OK:
    The torque converter clutch operates normally.


NG
REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY
OK

REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY