how to fix a check engine light with code P0700 on Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a level surface and the engine is cool.

2. Check and Replace Transmission Fluid

• Tools Required: Transmission jack, drain pan, funnel, torque wrench.
• Locate the transmission fluid drain plug and place a drain pan underneath.
• Remove the drain plug and allow the fluid to drain completely.
• Inspect the fluid. If it appears brown or has a burnt smell, replacement is necessary.
• Replace the drain plug and tighten to the manufacturer’s torque specifications (usually around 30 lb-ft).
• Refill the transmission with the appropriate fluid type as specified in the owner’s manual using a funnel.

3. Inspect and Repair Wiring and Connectors

• Tools Required: Multimeter, wire brush, dielectric grease.
• Inspect the wiring harness connected to the TCM for frays or corrosion.
• Use a multimeter to check for continuity in the wiring.
• Clean any corroded connectors with a wire brush.
• Apply dielectric grease to the connectors to prevent future corrosion.

4. Replace Transmission Control Module (if necessary)

• Tools Required: Socket set, torque wrench.
• Remove the TCM from its mounting location, typically located near the transmission.
• Disconnect the electrical connectors from the TCM.
• Install the new TCM by reversing the removal steps and tightening bolts to the specified torque.