how to diagnose P0700 transmission code on my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to ensure safety during electrical work.

2. Inspect and Replace Transmission Fluid

• Sub-steps:
  • Locate the transmission dipstick and remove it.
  • Check fluid level; add the correct type of ATF (Automatic Transmission Fluid) if low.
  • If the fluid appears burnt or dirty, drain the old fluid using a drain pan.
  • Replace with fresh ATF according to manufacturer specifications (likely Toyota WS fluid).
• Tools Required:
  • Transmission fluid pump, drain pan, funnel

3. Inspect Wiring and Connectors

• Sub-steps:
  • Visually inspect the wiring harness leading to the TCM and solenoids.
  • Check for signs of wear, fraying, or corrosion on connectors.
  • Repair or replace any damaged wiring or connectors as necessary.
• Tools Required:
  • Wire brush (for cleaning), electrical connector cleaner

4. Test and Replace Transmission Solenoids

• Sub-steps:
  • Using a multimeter, measure the resistance of each solenoid according to specifications.
  • If any solenoid is out of specification, remove and replace it.
  • Reinstall the new solenoids, ensuring proper torque specifications are followed.
• Tools Required:
  • Multimeter, socket set, torque wrench

5. Update Transmission Control Module (if applicable)

• Sub-steps:
  • Using a compatible scan tool, check for available software updates for the TCM.
  • Follow the manufacturer’s instructions to update the software if a new version is available.
• Tools Required:
  • OBD-II scanner with programming capability