what should I do if my Toyota Corolla E170 (2013-2019) shows a P0700 code?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the vehicle is on a level surface and secure it with jack stands if needed.

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, fluid catch pan
• Remove the transmission fluid dipstick and check the fluid level.
• If the fluid is low or discolored, drain the old fluid into a catch pan using a fluid pump.
• Replace with the manufacturer-recommended transmission fluid (typically Toyota ATF WS).
• Refill the transmission fluid to the correct level using the fluid pump.

3. Inspect and Repair Wiring

• Tools Required: Multimeter, wire brush, electrical connector cleaner
• Inspect the wiring harness for any signs of wear or damage.
• Use a multimeter to check for continuity and proper voltage at the TCM connector.
• Clean any corroded connectors with electrical connector cleaner and a wire brush.
• Repair or replace any damaged wiring or connectors as needed.

4. Test and Replace the TCM (if necessary)

• Tools Required: OBD-II scanner
• If the TCM is suspected to be faulty, obtain a replacement unit.
• Follow the manufacturer's instructions for removing and installing the new TCM.
• Reconnect all wiring and connectors.
• Clear the P0700 code using the OBD-II scanner and test drive the vehicle.