how to troubleshoot my Toyota RAV4's transmission slipping?

Solution

1. Preparation

• Gather necessary tools and parts. Ensure the vehicle is parked on a level surface and securely lift it with jack stands if necessary.
• Tools Required: Socket set, OBD-II scanner, Transmission fluid, Funnel, Torque wrench.

2. Check and Replace Transmission Fluid

• Locate the transmission dipstick (if equipped) and remove it to check fluid level.
• If low, add the correct type of transmission fluid (check owner’s manual for specifications).
• If fluid is dark or smells burnt, perform a fluid change:
  1. Place a drain pan under the transmission pan.
  2. Remove the pan bolts with a socket and carefully lower the pan.
  3. Remove and replace the transmission filter.
  4. Clean the pan and magnet of any debris.
  5. Reattach the pan with new gasket material and torque to manufacturer specifications.
  6. Refill the transmission with the correct fluid type using a funnel.

3. Inspect and Replace the Transmission Filter

• If the transmission filter was not replaced in the previous step:
  1. Disconnect any lines or connectors that may obstruct filter removal.
  2. Remove the old filter and replace it with a new one, ensuring it seats properly.
  3. Reconnect any lines or connectors.

4. Check Electrical Connections

• Inspect the wiring harness and connectors leading to the transmission for any signs of wear, corrosion, or loose connections.
• Clean or repair any damaged connectors and ensure secure fitting.

5. Adjust or Replace Throttle Position Sensor (TPS)

• If TPS is malfunctioning:
  1. Locate the TPS on the throttle body.
  2. Disconnect the wiring harness and remove the mounting screws.
  3. Install a new TPS and reconnect the wiring harness.