how to diagnose a P0700 code in my Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle battery to ensure safety while working on electronic components.
• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, transmission fluid.

2. Check Transmission Fluid

• Remove the transmission dipstick and wipe it clean.
• Reinsert the dipstick and remove it again to check the fluid level; add fluid if low.
• Inspect the fluid’s color and smell; if it's dark or burnt, consider performing a fluid change.

3. Inspect and Repair Wiring

• Visually inspect the wiring harness connected to the TCM.
• Repair or replace any damaged wiring or connectors found during the inspection.
• Ensure all connections are secure.

4. Test and Replace TCM (if necessary)

• If the TCM is suspected to be faulty, remove it from its mounting location.
• Install the new TCM, ensuring proper alignment and tightening to manufacturer's torque specifications.
• Reconnect all wiring harnesses and connectors.

5. Reconnect Battery and Clear Codes

• Reconnect the battery and use the OBD-II scanner to clear any stored codes.
• Start the vehicle and check that the check engine light is off.