my Toyota Tacoma N300 (2016-Present) engine light came on and I got code P0700, what should I do?

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the battery to prevent electrical shorts.

2. Check Transmission Fluid

• Tools Required: Transmission fluid dipstick, funnel
• Remove the transmission dipstick, wipe it clean, and reinsert it.
• Pull it out again and check the fluid level. If low, add the appropriate transmission fluid (refer to owner's manual for specification).
• Inspect fluid for burnt odor or metal shavings, indicating internal damage.

3. Inspect Wiring and Connectors

• Tools Required: Wire brush, multimeter
• Visually inspect the wiring harness connected to the TCM and transmission for any signs of wear, fraying, or corrosion.
• Clean any corroded connectors with a wire brush.
• Use a multimeter to check for continuity in the wiring. Repair or replace any damaged wires as necessary.

4. Test Transmission Control Module

• Tools Required: Multimeter
• Locate the TCM, typically found near the transmission or under the dashboard.
• Connect the multimeter to the appropriate terminals on the TCM to check for proper voltage and ground.
• If the TCM fails to meet specifications, replace it with a compatible unit.

5. Reassemble and Test

• Reconnect the battery.
• Clear any diagnostic codes using the OBD-II scanner.
• Test drive the vehicle to ensure proper operation and that the check engine light does not reappear.