my Toyota Corolla E140 (2006-2013) has a check engine light and I get P0700 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to prevent any electrical short circuits while working.
• Ensure the vehicle is on a flat surface and use wheel chocks for safety.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission fluid dipstick and remove it.
  2. Check fluid level; add the correct type of transmission fluid (Toyota ATF WS) if low. Ensure the fluid is not burnt or contaminated.
  3. If fluid is burnt or contaminated, drain the transmission fluid using a drain pan and replace with new fluid.
  4. Replace the transmission fluid filter if applicable.

Tools Required:

• Transmission fluid pump
• Drain pan
• Socket set

3. Inspect and Repair Wiring/Connectors

• Sub-steps:
  1. Visually inspect the wiring harness and connectors between the TCM and the transmission.
  2. Repair or replace any damaged wires or corroded connectors.

Tools Required:

• Wire strippers/crimpers
• Electrical tape or heat shrink tubing

4. Test and Replace TCM (if necessary)

• Sub-steps:
  1. Using a multimeter, test the TCM for proper voltage and functionality.
  2. If the TCM is faulty, remove it by unscrewing the mounting bolts and disconnecting the wiring harness.
  3. Install a new or refurbished TCM, ensuring all connections are secure.

Tools Required:

• Multimeter
• Socket set

Safety Warnings:

• Disconnect battery before working on electrical systems.