P0543 Diagnostic Trouble Code

P0543 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a P0543 diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
Diminished fuel efficiency

Possible Causes :

The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Defective ECU strategies or components will prevent proper regeneration
Faulty IMRC actuator relay (if equipped)

Repair Processes :

Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors.

Process Tips

Diagnostic trouble code P0543 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P0543.

Fortunately, P0543 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0543 Trouble Code For Specific Cars

P0543 Jaguar Xk-ss Seat Driver Rear Down Circuit Short To Battery
P0543 Railton 16 Fuel Temperature Sensor A Circuit High Input
P0543 Toyota Mr2 Output Speed Sensor Circuit Malfunction
P0543 Nissan March Column Tilt Motor Stalled
P0543 Unicar Model T Power To Fan Circuit Overcurrent
P0543 Renault 6 Gear Lever Y Position Circuit
P0543 Seat 1400 Injector Circuit Malfunction - Cylinder 3