what causes the transmission to slip in my Toyota RAV4 XA50 (2019-2024)?

Solution

1. Preparation

• Gather necessary tools and safety equipment.
• Ensure the vehicle is parked on a level surface with the engine off.
• Wear safety gloves and goggles.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission dipstick and remove it.
  2. Wipe the dipstick clean and reinsert it to check fluid level.
  3. If low, add the recommended transmission fluid (Toyota ATF WS).
  4. If fluid is dark or smells burnt, proceed to drain and replace the fluid.
• Tools Required: Transmission fluid pump, funnel, fluid catch pan.

3. Inspect and Replace Transmission Filter

• Sub-steps:
  1. Remove the transmission pan by loosening the bolts and allowing fluid to drain.
  2. Remove the old transmission filter and inspect for debris.
  3. Install the new filter and reattach the transmission pan with a new gasket.
• Tools Required: Socket set, gasket scraper, torque wrench (to torque pan bolts to manufacturer specifications).

4. Electrical Inspection

• Sub-steps:
  1. Disconnect the battery to avoid electrical short circuits.
  2. Inspect wiring harnesses and connectors associated with the TCM.
  3. Repair or replace any damaged wiring or connectors.
• Tools Required: Multimeter, wire strippers, soldering kit if needed.

5. Reprogram or Replace TCM (if necessary)

• Sub-steps:
  1. Use the OBD-II scanner to check for TCM fault codes.
  2. If the TCM is faulty, remove it following the service manual instructions.
  3. Install the new or reprogrammed TCM and reconnect the battery.
• Tools Required: OBD-II scanner, socket set.