how to diagnose P0700 code in Toyota Corolla E140 (2006-2013)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and secure it with wheel chocks.
• Disconnect the battery to prevent electrical shorts.

2. Fluid Inspection and Replacement

• Sub-steps:
  1. Locate the transmission dipstick and remove it.
  2. Check fluid level; add fluid if low.
  3. Inspect fluid condition (color and smell). If burnt or contaminated, proceed to fluid change.
  4. Drain the old transmission fluid using a drain pan.
  5. Replace the transmission fluid filter if applicable.
  6. Refill with manufacturer-recommended fluid type to the proper level.

3. Wiring and Connector Inspection

• Sub-steps:
  1. Locate the wiring harness and connectors leading to the TCM.
  2. Visually inspect for any signs of wear, corrosion, or damage.
  3. Use a multimeter to check for continuity in the wires.
  4. Repair or replace damaged wiring or connectors as necessary.

4. TCM Testing and Replacement

• Sub-steps:
  1. Reconnect the battery.
  2. Use an OBD-II scanner to check for TCM communication with the ECU.
  3. If communication fails, remove the TCM for testing.
  4. Bench test the TCM if possible or replace it with a new unit.
  5. Reinstall the TCM and clear all fault codes from the system.