how to diagnose a transmission problem in my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather tools and equipment.
• Ensure the vehicle is parked on a level surface.
• Disconnect the negative battery terminal to prevent any electrical issues.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission dipstick (if applicable) or the fill plug.
  2. Remove the dipstick or fill plug and check fluid level; add fluid if necessary.
  3. If the fluid is dark or has a burnt smell, drain the transmission fluid using a suitable drain pan.
  4. Replace with the manufacturer-recommended transmission fluid (e.g., Toyota Type T-IV).
  5. Reinstall the dipstick or fill plug securely.

3. Inspect and Repair Transmission Components

• Sub-steps:
  1. Remove any necessary covers or shields to access the transmission.
  2. Inspect the transmission mount for wear or damage; replace if necessary.
  3. Check the condition of the shift linkage and adjust or replace as needed.
  4. If codes indicate solenoid issues, remove and replace the affected solenoid(s) according to manufacturer specifications.

4. Reprogram or Replace TCM (if necessary)

• Sub-steps:
  1. If the TCM is faulty, remove it from its mounting location.
  2. Install the new TCM, ensuring all connectors are secure.
  3. Use a compatible scan tool to reprogram the new TCM according to manufacturer guidelines.