how to resolve the P0700 code in my Toyota Highlander Third Generation (2014-2019)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, fluid pump, transmission fluid.
• Disconnect the vehicle battery to avoid electrical shorts.
• Allow the engine to cool before working on the transmission.

2. Address Transmission Fluid Issues

• Sub-steps:
  1. Locate the transmission dipstick and remove it.
  2. Check the fluid level, adding fluid if low.
  3. If the fluid is dirty or burnt, drain the transmission fluid using a fluid pump.
  4. Replace the fluid with the manufacturer's recommended transmission fluid type.

3. Inspect and Repair Wiring

• Sub-steps:
  1. Visually inspect the wiring harness connected to the TCM for any damaged wires or connectors.
  2. Repair any damaged wiring using heat-shrink tubing and electrical tape.
  3. Ensure all connectors are securely attached and free from corrosion.

4. Replace or Reprogram TCM

• Sub-steps:
  1. If the TCM is faulty, remove it by unscrewing the mounting bolts and disconnecting the electrical connectors.
  2. Install the new or reprogrammed TCM by reversing the removal steps.
  3. Reconnect the battery and recheck all connections.

5. Test Drive

• Sub-steps:
  1. Start the vehicle and allow it to reach operating temperature.
  2. Drive the vehicle under various conditions (city, highway) to ensure proper transmission operation.
  3. Monitor for any error codes using the OBD-II scanner after the test drive.