how to troubleshoot P0700 code on my Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench
• Ensure the vehicle is parked on a level surface, and the engine is turned off. Disconnect the battery negative terminal for safety.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission dipstick and remove it to check fluid level.
  2. If low, add the recommended transmission fluid as specified in the owner’s manual.
  3. If the fluid is dark or has a burnt smell, drain the old fluid and replace it with new fluid.
  4. Recheck the fluid level after replacement and ensure it is within the proper range.

3. Inspect and Repair Wiring/Connectors

• Sub-steps:
  1. Visually inspect the wiring harness and connectors leading to the TCM.
  2. Repair or replace any damaged wiring or corroded connectors.
  3. Ensure all connections are secure and free of moisture.

4. Test and Replace Transmission Control Module (if necessary)

• Sub-steps:
  1. Using a multimeter, check the power and ground circuits to the TCM as specified in the service manual.
  2. If the TCM fails the test, remove it using appropriate sockets and tools.
  3. Install the new TCM, ensuring all connections are secure.
  4. Torque the mounting bolts to the manufacturer’s specifications.

5. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the battery terminal and ensure it is tight.
  2. Use the OBD-II scanner to clear the P0700 code and any related codes.
  3. Start the engine and check for any new codes.