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

Solution

1. Preparation

• Gather tools and ensure the vehicle is parked on a level surface.
• Disconnect the negative terminal of the battery.
• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench.

2. Check and Replace Transmission Fluid (if necessary)

• Sub-steps:
  1. Remove the transmission fluid dipstick and check the fluid level and condition.
  2. If low or dirty, drain the old transmission fluid from the pan.
  3. Replace the transmission filter if applicable.
  4. Refill with new transmission fluid according to the manufacturer's specifications (usually Toyota WS fluid).
• Safety Warning: Allow the engine to cool before attempting to open the transmission fluid pan.

3. Repair or Replace Faulty Wiring/Connectors

• Sub-steps:
  1. Identify any damaged wires or corroded connectors in the transmission control system.
  2. Repair wiring with electrical tape or replace damaged sections with new wire.
  3. Clean corroded connectors with electrical contact cleaner and ensure a secure connection.
• Tools Required: Wire cutters, soldering iron (if needed), electrical tape.

4. Replace Transmission Control Module (if required)

• Sub-steps:
  1. Locate the TCM, usually found near the transmission or behind the dashboard.
  2. Disconnect the wiring harness from the TCM.
  3. Unscrew and remove the TCM using the appropriate socket size.
  4. Install the new TCM, ensuring all connections are secure.
  5. Reconnect the negative terminal of the battery.
• Safety Warning: Disconnect the battery before working on electrical components.