how to fix P0700 transmission control system malfunction in Toyota Highlander Third Generation (2014...

Solution

1. Preparation

• Gather tools and parts necessary for the repair.
• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, transmission fluid pump.
• Parts Required: Transmission fluid, transmission filter (if necessary), TCM (if replacement is needed).
• Ensure the vehicle is parked on a flat surface and the engine is turned off.

2. Transmission Fluid Inspection and Replacement

• Sub-steps:
  1. Locate the transmission dipstick and check the fluid level.
  2. If fluid is low, top it off with the correct type of transmission fluid.
  3. If the fluid is dirty or burnt, proceed to change it:
     • Remove the transmission pan bolts using a socket set.
     • Carefully lower the pan and drain the old fluid into a suitable container.
     • Replace the transmission filter, if applicable, and clean the pan thoroughly.
     • Reinstall the pan with a new gasket and torque bolts to manufacturer specifications (typically 7-9 ft-lbs).
     • Refill the transmission with the correct type and amount of fluid.

3. TCM Inspection and Replacement

• Sub-steps:
  1. Disconnect the battery to ensure safety.
  2. Locate the TCM (usually near the transmission or under the dashboard).
  3. Remove the connectors from the TCM and inspect for corrosion or damage.
  4. If testing indicates a malfunctioning TCM, remove it by unscrewing the mounting bolts and carefully detaching it.
  5. Install the new TCM by reversing the removal process and reconnecting the battery.