how to fix P0440 code in Toyota Corolla E140 (2006-2013)

Learn how to diagnose and fix P0440 EVAP system malfunction in Toyota Corolla E140 (2006-2013). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal.

2. Inspect and Replace Gas Cap

• Tools Required: None
• Remove the gas cap and inspect for damage; replace if necessary.
• Reinstall the gas cap securely and ensure it clicks.

3. Inspect EVAP Hoses

• Tools Required: Pliers, flashlight
• Follow the EVAP hose routing from the fuel tank to the engine bay.
• Check for cracks, loose connections, or signs of wear.
• Replace any damaged hoses with OEM parts.

4. Test and Replace EVAP Purge and Vent Valves

• Tools Required: Multimeter, screwdriver
• Disconnect the electrical connectors from the purge and vent valves.
• Use a multimeter to test the resistance; refer to the service manual for acceptable values.
• Replace any malfunctioning valves with OEM replacements.

5. Smoke Test the EVAP System

• Tools Required: Smoke machine, safety goggles
• Connect the smoke machine to the EVAP system.
• Activate the smoke machine and observe for smoke escaping from any leaks.
• Seal any identified leaks and replace damaged components.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0440 code.
• Start the engine and check for any reoccurring codes.