Guide To P043F OBD Error Code Solutions

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The vacuum pump creates negative pressure in the canister pump module to determine leak criterion and then pressure is measured. If all these conditions are not met, then the engine control module would set the P043F trouble code.

The P043F can be described as Evaporative Emission System Leak Detection Reference Orifice High Flow.

This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present.The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another.

This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

What causes this problem with the Evaporative Emission System Leak Detection Reference Orifice High Flow?

• Defective EVAP pressure sensor
• There can be a damaged or clogged EVAP leak detection orifice
• Charcoal element canister might be ruptured
• The EVAP or vacuum lines can be crushed or cracked
• Flaws in the vent control or purge control solenoid
• Leak detection pump can be poor
• Faults in the vacuum pump module
• There can be opened or shorted vacuum pump module harness
• There can be poor electrical connection in the vacuum pump module circuit
• Clogged, cracked or broken EVAP system hose
• Defaults in the engine control module

1. Powertrain Control Module - OBD Code P043F can appear because of faulty Powertrain Control Module.
2. Evap Purge Valve - There can be some issues with the Evap Purge Valve due to which you may see P043F code appearing over and over again. Visit us to buy best quality Evap Purge Valve online.
3. Electronic Control Unit - Are you facing some faults in your Electronic Control Unit? Don’t worry and get them replaced or else P043F code can turn up.
4. EVAP Canister - Common cause behind this P043F error code can be some fault in EVAP Canister. So, it will be a good decision to replace them now.
5. Engine Control Module - Electronic Control Unit is perfectly fine but still but having that trouble code P043F flashing? In such a situation your Engine Control Module might be faulty. Why don’t you think of getting that replaced?
6. Canister Purge Valve - The P043F code can also arise due to some issues in Canister Purge Valve. So, it is advised to replace them as soon as possible.
7. Purge Solenoid - P043F code does not really end up spoiling your Canister Purge Valve, but it might also accompany few Purge Solenoid issues. We have best Purge Solenoid with us.

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P043F here:

Common Symptoms

• There can be hissing or humming sound even when the ignition switch is off
• Slightly diminished fuel efficiency
• Some other EVAP leak detection codes may be stored
• The service engine soon warning light can start flashing

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P043F:

• The quirky EVAP pressure sensor should be replaced
• If there are some faults in the vent control or purge control solenoid, then it should be repaired or replaced
• The vacuum pump module should be replaced
• There can be clogged, cracked or broken EVAP system hose. Make sure that you replace it properly
• You must repair the poor electrical connection in the vacuum pump module circuit
• Restore or repair the engine control module

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If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

You will need a diagnostic scanner, a digital volt/ohmmeter and a reliable vehicle information source for diagnosing a code P043F. You can always use your vehicle information source to check for technical service bulletins (TSB) that match symptoms and codes presented in the vehicle being diagnosed. If you can find the appropriate TSB, it will likely direct you to the exact source of the malfunction without costing you a lot of time and trouble.

If there are other EVAP system codes present, diagnose and repair these before attempting to diagnose the P043F. The P043F could be in reaction to the conditions which have caused other EVAP codes. Before getting your hands greasy, you should connect the scanner to the vehicle diagnostic port and retrieve all stored codes and freeze frame data. After this is done, then clear the codes and test-drive the vehicle to see if the code is reset. You should test-drive the vehicle until one of two things occurs; the PCM enters readiness mode or the code is reset. If the PCM enters readiness mode, you have an intermittent problem and there's not a lot that you can do about it now. If it returns later, the failure condition may have worsened and you can take another run at it. If the P043F is reset, you know that you have a hard-and-fast malfunction and it's time to dig in and find it.

Begin with a visual inspection of any EVAP system related wiring harnesses and connectors that you can gain access to within a reasonable amount of time. Obviously, you aren't going to remove any major components to have a look but concentrate your efforts on high-temperature areas and areas where wiring, connectors, vacuum lines, and vapour hoses may interfere with moving components. A lot of cars are repaired during this phase of the diagnostic process, so focus and put a little effort into it. Connect the scanner to the vehicle diagnostic port and observe the data stream. EVAP flow and pressure data should comply with manufacturer's specifications when the system is activated. In most cases, EVAP system activation (purge control solenoid and/or leak detection pump) may be possible using the scanner. Some EVAP sensor testing will need to be performed with the system activated.

Use the DVOM to test EVAP sensors and solenoids in order to compare them with manufacturer's specifications. Any related components that do not coincide with specifications will need to be replaced. If possible, gain access to the EVAP leak detection reference orifice to check for charcoal contamination. If charcoal contamination is found, suspect that the EVAP canister has been compromised. Before testing system circuits with the DVOM, disconnect any related controllers to prevent damage. Test for the appropriate levels of resistance and continuity between individual EVAP components and the PCM using the DVOM. Circuits which do not align with specifications will need to be repaired or replaced.

• A loose or failed fuel cap will not cause a code P043F to be stored
• This code is applicable only to vehicle EVAP systems which utilize a leak detection system

Common Mistakes When Diagnosing The P043F Code

• There can be a EVAP line leak/restriction
• Some issues in the wiring
• Defects in the leak detection pump module 

P043E - Evaporative Emission System Leak Detection Reference Orifice Low Flow