how to diagnose P0700 code in Toyota Tacoma N300 (2016-Present)

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Transmission Fluid

• Sub-steps:
  1. Remove the transmission fluid dipstick and check the fluid level.
  2. If the fluid is low, add the appropriate Toyota ATF (automatic transmission fluid).
  3. If the fluid is burnt or contaminated, proceed to drain and replace it.
  4. Remove the transmission drain plug and let the fluid drain completely.
  5. Replace the drain plug and refill with new ATF through the dipstick tube.
• Tools Required: Fluid pump, socket set, container for old fluid.

3. Check and Repair Wiring and Connectors

• Sub-steps:
  1. Inspect the wiring harness connected to the TCM and transmission for frays or disconnections.
  2. Clean any corroded connectors using electrical contact cleaner.
  3. Repair or replace damaged wires as necessary.
• Tools Required: Electrical contact cleaner, wire strippers, soldering iron or crimp connectors.

4. Test and Replace Transmission Range Sensor (if necessary)

• Sub-steps:
  1. Disconnect the sensor connector.
  2. Use a multimeter to test the resistance across the sensor terminals as per manufacturer specifications.
  3. If the sensor fails the test, replace it with a new one.
  4. Reconnect the sensor and ensure it is securely mounted.
• Tools Required: Multimeter, socket set.

5. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the negative terminal of the battery.
  2. Use the OBD-II scanner to clear the P0700 code and any other related codes.
• Tools Required: OBD-II scanner.