how to diagnose a P0700 code in my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, basic hand tools, transmission fluid.
• Ensure the vehicle is parked on a level surface, and the engine is off before starting work.

2. Check Transmission Fluid

• Open the hood and locate the transmission dipstick.
• Remove the dipstick, wipe it clean, and reinsert it fully before removing it again to check the fluid level.
• If low, add the correct type of transmission fluid as specified in the owner’s manual.
• If the fluid is dark or smells burnt, it may require a fluid change.

3. Inspect Wiring and Connectors

• Locate the TCM and inspect the wiring harness for any visible damage or corrosion.
• Disconnect the TCM connector and inspect the pins for corrosion or bent pins.
• Use a multimeter to check for continuity in the wiring between the TCM and the transmission.

4. Test Transmission Control Module (TCM)

• With the multimeter, check for the correct voltage at the TCM power inputs.
• Refer to the wiring diagram in the service manual for specific pin locations and voltage specifications.
• If voltage is not within specifications, trace back to the fuse and battery connections.

5. Replace Faulty Components

• If any components such as the TCM or transmission range sensor are found faulty, replace them with OEM parts.
• Ensure proper torque specifications are followed when re-installing components.