my Toyota Tacoma N300 (2016-Present) has a check engine light and code P0700, what does it mean?

Solution

1. Preparation

• Gather tools and parts. Ensure the vehicle is parked on a level surface and the engine is off.
• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, fluid catch pan.

2. Check Transmission Fluid

• Locate the transmission dipstick or fill plug.
• Remove the dipstick or plug; if checking fluid level, wipe clean and reinsert to check the level.
• If fluid is low, add the manufacturer-recommended ATF (automatic transmission fluid).
• If fluid is dirty or smells burnt, proceed to drain and replace the fluid.

3. Inspect Wiring and Connectors

• Visually inspect the wiring harness leading to the TCM and transmission range sensor.
• Disconnect the connectors and check for corrosion or bent pins.
• Clean connectors with electrical contact cleaner and reconnect securely.

4. Test the Transmission Control Module (TCM)

• Using a multimeter, check voltage at the TCM connector while the ignition is in the "ON" position.
• If voltage is absent or incorrect, investigate the wiring back to the power source.
• If voltage is present, proceed to check the TCM's ground connection.

5. Replace Faulty Components

• If the transmission range sensor or TCM has been diagnosed as faulty, remove the defective component:
  • Disconnect battery before working on electrical systems.
  • Remove any mounting bolts and harness connectors.
  • Install the new component and secure it with mounting bolts, ensuring proper torque specifications.
• Reconnect the battery after all repairs are completed.