Evaporative Emission System Leak Detection Reference Orifice High Flow
Table of contents
P043F TOYOTA Possible Causes
- Faulty Vacuum Pump Module
- Vacuum Pump Module harness is open or shorted
- Vacuum Pump Module circuit poor electrical connection.
- Faulty Engine Control Module (ECM)
How do I fix code P043F TOYOTA?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
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.
Cost of diagnosing the P043F TOYOTA code
The cost of diagnosing the P043F TOYOTA code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P043F TOYOTA Description
5 hours after the ignition switch is turned OFF, the electric vacuum pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The Engine Control Module (ECM) monitors for leaks and actuator malfunctions based on the EVAP pressure. To determine the leak criterion (Reference pressure), a vacuum pump creates negative pressure in the canister pump module through 0.02 inch orifice and pressure is measured. If the conditions are not met, the Engine Control Module the code will be set.