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P043F Toyota Code - Evaporative Emission System Reference Orifice High Flow

Quick Answer

5 hours after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in the Evaporative Emission (EVAP) system. Common causes include Faulty Canister Pump Module, Canister Pump Module harness is open or shorted, Canister Pump Module circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
P043F Toyota indicates Evaporative Emission System Reference Orifice High Flow.
Common causes
Common causes include Faulty Canister Pump Module, Canister Pump Module harness is open or shorted, Canister Pump Module circuit poor electrical connection.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
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Code Popularity 42,286
How popular is this code, among other codes? Medium
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Table of contents Created and updated by William Orellana on Mar 26, 2024
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Code P043F Toyota Description

5 hours after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in the Evaporative Emission (EVAP) system. The Engine Control Module (ECM) monitors for leaks and actuator malfunctions based on the EVAP pressure. The leak detection pump creates negative pressure through the reference orifice. When the system is normal, the EVAP pressure is between 97 to 100 kPa(abs) [726 to 750 mmHg(abs) (Typical value)] and saturated within a minute. If not, the ECM interprets this as a malfunction. The ECM illuminates the MIL and stores a Diagnostic Trouble Code (DTC) if this malfunction is detected in consecutive drive cycles. The Canister Pump Module is attached to the EVAP Canister and contains the Canister Pressure Sensor, the Leak Detection Pump, and the Vent Valve.
OBDII Code P043F Toyota - Evaporative Emission System Reference Orifice High Flow - AutoCodes.com
P043F Toyota Code - Evaporative Emission System Reference Orifice High Flow
What does this mean?

What are the Possible Causes of the DTC P043F Toyota?

  • Faulty Canister Pump Module
  • Canister Pump Module harness is open or shorted
  • Canister Pump Module circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P043F Toyota?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

There are Factory Service Bulletins for the following Toyota models:

2005-2006 Toyota Corolla
2005-2006 Toyota Matrix
2005-2006 Toyota Corolla, Matrix Factory Service Bulletin OBDII Code P043F

2006-2009 Toyota RAV4
2006-2009 Toyota RAV4 Factory Service Bulletin OBDII Code P043F
The service bulletin recommends replacing the EVAP Charcoal Canister Assembly to repair the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P043F Toyota code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P043F Toyota code?

Need more information on how to fix the P043F Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P043F Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P043F Toyota Code

1. What are the common symptoms of the OBDII code P043F in a Toyota related to the Evaporative Emission System Reference Orifice High Flow issue?

The common symptoms include the Check Engine light turning on, decreased fuel efficiency, and a noticeable gasoline odor near the vehicle.

2. What are the possible causes of the P043F code indicating a high flow in the Evaporative Emission System Reference Orifice in a Toyota?

Possible causes include a damaged or clogged reference orifice, a malfunctioning purge valve, a faulty EVAP canister, or a leak in the EVAP system.

3. How can I diagnose the P043F code in my Toyota related to the Evaporative Emission System Reference Orifice High Flow problem?

Diagnosis involves using an OBDII scanner to retrieve the specific code, inspecting the EVAP system components for damage or leaks, and testing the purge valve and reference orifice for proper functionality.

4. Are there any DIY repair tips for fixing the P043F code related to the Evaporative Emission System Reference Orifice High Flow in a Toyota?

DIY repair tips include checking and replacing damaged hoses, cleaning or replacing the reference orifice, testing and replacing the purge valve if necessary, and ensuring all EVAP system connections are secure.

5. Is it safe to continue driving my Toyota with the P043F code indicating a high flow in the Evaporative Emission System Reference Orifice?

It is generally not recommended to continue driving with this code illuminated, as it can lead to increased emissions, potential damage to other engine components, and may cause the vehicle to fail an emissions test.

6. How much does it typically cost to repair the P043F code related to the Evaporative Emission System Reference Orifice High Flow in a Toyota?

The cost of repair can vary depending on the specific issue causing the code, but it may range from $100 to $500 or more, including parts and labor.

7. Can the P043F code be triggered intermittently, or does it always indicate a persistent issue with the Evaporative Emission System Reference Orifice in a Toyota?

The code can be triggered intermittently in some cases, especially if the issue is related to a loose gas cap or a temporary EVAP system leak. However, it is important to diagnose and address the root cause to prevent recurring problems.

8. Will resetting the Check Engine light make the P043F code related to the Evaporative Emission System Reference Orifice High Flow disappear in a Toyota?

Resetting the Check Engine light may temporarily turn off the warning indicator, but the underlying issue causing the P043F code will likely persist until properly diagnosed and repaired.

9. How long does it take to repair the P043F code associated with the Evaporative Emission System Reference Orifice High Flow in a Toyota?

The repair time can vary based on the complexity of the issue, accessibility of components, and the expertise of the technician, but it may take anywhere from 1 to 3 hours or more to address the problem effectively.

10. Can a mechanic easily fix the P043F code indicating a high flow in the Evaporative Emission System Reference Orifice in a Toyota, or is specialized training required?

A qualified mechanic with experience in diagnosing and repairing EVAP system issues should be able to address the P043F code, but specialized training and knowledge of Toyota's specific systems may be beneficial in complex cases.

Discuss the causes and fixes for P043F Toyota OBDII Code

Submit a New Comment

  • Hola tengo esos códigos le cambié el caniater y siguen las mismas fallas que puedo hacer

    Reply to Comment

  • Que model y año es su Toyota? puedo tratar de investigar si hay un problema específico para su modelo.

    Reply to Comment
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