P0766

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).

P0766:

Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of the shift solenoid valves and valve body.

MONITOR DESCRIPTION
This DTC indicates "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 same, the ECM illuminates the MIL and stores the DTC.

MONITOR STRATEGY:

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS (PART 1):

TYPICAL ENABLING CONDITIONS (PART 2):

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS:

TYPICAL MALFUNCTION THRESHOLDS
Either of these conditions are met:
OFF malfunction or ON malfunction
2 detections are necessary per driving cycle:
1st detection; temporary flag ON
2nd detection; pending fault code ON

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.
5. Turn the intelligent tester ON.
6. Enter these menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST.





7. Follow the instructions on the tester and read 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 you to confirm the problem.

HINT:
- 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 display on the intelligent tester.