Toyota RAV4 Service Manual: 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).

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.).

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.

1. The ecm commands the 1st gear, but the actual gear is 2nd.
2. The ecm commands the 2nd gear, but the actual gear is 1st.

Monitor strategy

Typical enabling conditions

Typical malfunction thresholds

Either of the following conditions is 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

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 can vim. Then connect the can vim to the dlc3.
4. Turn the ignition switch on and turn the tester on.
5. Enter the following menus: diagnosis / enhanced obd ii / active test.
6. Follow the instructions on the tester and read 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 (see page ax-31).

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 tester.

1. Check other dtc output (in addition to dtc p0746)

1. Connect the intelligent tester to the can vim. Then connect the can vim to the dlc3.
2. Turn the ignition switch on and turn the tester on.
3. Enter the following menus: diagnosis / enhanced obd ii / dtc info / current codes.
4. Read the dtcs using the tester.

Result 

Hint:

If any other codes besides p0746 are output, perform the troubleshooting for those dtcs first.

2. Inspect shift solenoid valve sl1

1. Remove the shift solenoid valve sl1.
2. Measure the resistance of the solenoid valve.

Standard resistance: 5.0 To 5.6 Ùat 20°c (68°f)

3. Connect the battery's positive (+) lead with a 21 w bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.

Ok: valve moves and makes operating noise.

3. Inspect transmission valve body assembly

1. Check the transmission valve body assembly.

Ok: there are no foreign objects on each valve.

4. Inspect torque converter clutch assembly

1. Check the torque converter clutch assembly (see page ax-153).

Ok: the torque converter clutch operates normally.

Repair or replace automatic transaxle assembly