P0746

DTC P0746 Pressure Control Solenoid "A" Performance (Shift Solenoid Valve SL1)

DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd or O/D gear).

P0746:

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

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 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.

Example:
When either condition (a) or (b) is met, the ECM detects a malfunction.
a. The ECM commands the 1st gear, but the actual gear is 2nd.
b. The ECM commands the 2nd gear, but the actual gear is 1st.

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 (A) and (B)
2 detections are necessary per driving cycle:
1st detection; temporary flag ON
2nd detection; pending fault code ON

HINT: Performing the ACTIVE TEST using the intelligent tester allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method to shorten labor time.

It is possible to display the DATA LIST 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 more.
- This shift position commanded by the ECM is shown in the DATA LIST/SHIFT display on the intelligent tester.