how to resolve the P0700 code in my Toyota Corolla E170 (2013-2019)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, transmission fluid pump.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the vehicle to cool down if it has been running.

2. Check Transmission Fluid

• Sub-steps:
  1. Locate the transmission dipstick or fill plug.
  2. Remove the dipstick or fill plug; check fluid level and color.
  3. If low, add the recommended transmission fluid (Toyota ATF WS).
  4. If the fluid appears burnt or contaminated, proceed to drain and replace it.

3. Replace Transmission Fluid

• Sub-steps:
  1. Raise the vehicle securely using jack stands.
  2. Place a drain pan under the transmission pan.
  3. Remove the transmission pan bolts and gently pry the pan loose.
  4. Drain the old fluid completely and inspect the pan for metal shavings.
  5. Replace the transmission filter if applicable.
  6. Reinstall the transmission pan with a new gasket, tightening bolts to the manufacturer’s specified torque.
  7. Refill the transmission with the correct fluid type using a fluid pump through the dipstick tube.

4. Inspect and Repair Wiring/Connectors

• Sub-steps:
  1. Visually inspect the wiring harness connected to the TCM and transmission for frays or corrosion.
  2. Disconnect connectors and clean them thoroughly.
  3. Repair any damaged wiring or replace connectors as necessary.

5. Test Transmission Control Module

• Sub-steps:
  1. Reconnect the battery terminal and turn the ignition key to the "ON" position without starting.
  2. Use a multimeter to check the voltage at the TCM connectors; refer to the service manual for specific voltage requirements.
  3. If voltages are out of range, replace the TCM.