Error P0443 – how to fix?

Hello!,good night. In this post you will discover a description of fuses and relays Error P0443 – how to fix?

Include with images of block diagrams in addition to their locations. Highlighted the cigarette lighter fuse (as the most common thing people look for).
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Code definition P0443

Evaporative Emission Control System Purge Control Valve Circuit Malfunction

What does the code P0443 mean?

P0443 is a generic OBD-II code that indicates that the engine control module (ECM) detects a problem with the purge control valve or its control circuit. This could indicate an open or a short circuit in the valve or circuit.

What causes the code P0443?

  • The ECM has commanded the purge control valve to open and has detected an incomplete open or a short circuit.
  • The cause of P0443 could be an open circuit inside the blowdown control valve, or a corroded connector causing loss of contact with the valve.
  • The code can also be set if the wiring to the valve is broken between the ECM and the purge valve, causing an open circuit if the wire is cut, or a short if the wire is shorted to ground or a power source.

What are the symptoms of the P0443 code?

  • The Check Engine light will come on and the code will be stored in the ECM’s memory.
  • If your steam system is not working, you may notice a slight decrease in fuel mileage.

How can a mechanic diagnose the P0443 code?

  • Scan the codes and document the code in the ECM, review the data from the frozen frame to see when the fault occurred.
  • Inspect all steam bleed valve wiring and system, including the bleed valve connector, for corrosion, connections, damaged or loose wires.
  • Verifies that the purge valve vent is not clogged with dirt, debris, or cobwebs.
  • Performs a smoke leak test from the fuel vapor system to try to locate the cause of the vapor leak using the test vapor port
  • Checks the resistance of the purge control valve, then checks valve operation using the ECM to control the valve.

The most common errors when diagnosing the code P0443

  • Failure to check and assume that the purge control valve is faulty without thoroughly diagnosing the entire system and then finding that wiring is broken or cut
  • Failure to verify the fault and replace parts that may or may not be the cause of the problem.

How serious is the P0443 code?

  • The P0443 code turns on the check engine light and this alone causes the exhaust emission test to fail.
  • This code indicates that the fuel vapor control valve is faulty or the circuit does not communicate with the valve, causing the ECM to lose control of the valve.
  • If not working properly, the vapor recovery and reuse system can result in a loss of fuel mileage.

What repairs can remove the P0443 code?

  1. Check and replace the purge control valve.
  2. Repair damaged blowdown control valve wiring and protect from being damaged again.
  3. Replace purge valve

Additional notes regarding code P0443

The P0443 code is a fairly common code that vehicles arrive from today and causes a check engine light to turn on. The most common cause is the fuel cap has been accidentally dropped or loose after refueling. With this code, the most common fault is that the purge control valve has an internal open circuit or the purge valve is not trapping the vapors.

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