how to troubleshoot EVAP system issues in Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the vehicle battery to ensure safety while working on electrical components.

2. Inspect and Replace Gas Cap

• Sub-steps:
  • Remove the gas cap and inspect for cracks or deformities.
  • If damaged, replace it with a new one (ensure it is compatible with 2020-2023 Toyota Highlander).

3. Repair or Replace EVAP Components

• Sub-steps:
  • If any cracks or damage are found in the EVAP lines, replace the affected hoses.
  • If the charcoal canister is damaged, remove it by unbolting the retaining screws and disconnecting the hoses; install a new canister.
  • For the purge valve, disconnect the electrical connector and hoses, test its operation, and replace if faulty.

4. Conduct Smoke Test

• Sub-steps:
  • Connect a smoke machine to the EVAP system through the service port.
  • Introduce smoke into the system and visually inspect for any escaping smoke indicating a leak.
  • Seal any identified leaks with appropriate repairs or component replacements.

5. Reassemble and Reconnect

• Reconnect all components and hoses securely.
• Reinstall the gas cap and ensure it clicks into place.
• Reconnect the battery.