Toyota RAV4 Service Manual: Parts location

System diagram

The configuration of the electronic control system in the u140f automatic transaxle is as shown in the following chart.

System description

1. System description

1. The electronic controlled automatic transaxle (ect) is an automatic transaxle that electronically controls shift timing using the engine control module (ecm). The ecm detects electrical signals that indicate engine and driving conditions, and controls the shift point based on driver habits and road conditions. As a result, fuel efficiency and power transaxle performance are improved.

   Shift shock is reduced by controlling the engine and transaxle simultaneously.

In addition, the ect has the following features:

• Diagnostic function.
• Fail-safe function when a malfunction occurs.

How to proceed with troubleshooting

Hint:

• The ecm of this system is connected to the can and multiplex communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the can and multiplex communication systems.
• *: Use the intelligent tester.

1. Vehicle brought to workshop

2. Customer problem analysis

3. Inspect battery voltage

Standard voltage: 11 to 14 v

If the voltage is below 11 v, recharge or replace the battery before proceeding.

4. Connect intelligent tester to dlc3*

5. Check and clear dtcs and freeze frame data*

1. Refer to the dtc check / clear (see page ax-29).

6. Visual inspection

7. Setting check mode diagnosis*

1. Refer to the check mode procedure (see page ax-30).

8. Problem symptom confirmation

1. Refer to the road test (see page ax-12).

Result

9. Symptom simulation

1. Refer to the electronic circuit inspection procedure (see page in-37).

10. Dtc check*

1. Refer to the dtc check / clear (see page ax-29).

Result

11. Basic inspection

1. Refer to the automatic transmission fluid (see page ax-102).
2. Refer to the park/neutral position switch (see page ax-108).
3. Refer to the floor shift assembly (see page ax- 136).

12. Mechanical system tests

1. Refer to the mechanical system tests (see page ax-15).

13. Hydraulic test

1. Refer to the hydraulic test (see page ax-16).

14. Manual shifting test

1. Refer to the manual shifting test (see page ax- 17).

15. Problem symptoms table chapter 1

1. Refer to the problem symptoms table (see page ax-21).

16. Problem symptoms table chapter 2

1. Refer to the problem symptoms table (see page ax-21).

17. Part inspection

18. Dtc chart

1. Refer to the diagnostic trouble code chart (see page ax-35).

19. Circuit inspection

20. Identification of problem

21. Repair or replace

22. Confirmation test

End