Guide To P0543 OBD Error Code Solutions

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Detecting the P0543 code indicates that the PCM is reading an abnormal amount of input voltage from the intake air heater circuit.

An intake air heater is used by the engine control module which warms incoming air in order to achieve proper cylinder combustion. The voltage on the intake air heater circuits is detected by the engine control module so that it can determine if the heater is working efficiently or not. Now if the voltage would be too high, then the ECM will assume that the heater is in the open position when it isn’t meant to be and then it would alert the powertrain control module and would give rise to the P0543 fault code.

What causes this problem with the Intake Air Heater "A" Circuit Open?

• Damaged or corroded connector
• Defective or restricted air duct
• Some faults in the wiring
• Defects in the heater element relay
• Faulty heater element
• There can be some quirks in the temperature sensor
• Flaws in the blower motor
• Powertrain control module might start malfunctioning

1. Powertrain Control Module - There can be some issues with the Powertrain Control Module due to which you may see P0543 code appearing over and over again. Visit us to buy best quality PCM online.
2. Air Intake Temperature Sensor - A lot of issues can arise due to defective Air Intake temperature Sensor. Did you just see P0543 code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.
3. Engine Wiring Connectors - Faulty Engine Wiring Connectors can be the reason why P0543 code is flashing. Visit us to purchase top notch Engine Wiring Connectors online.
4. Engine Control Module - It is an important auto part which needs full care. A faulty Engine Control Module can be a reason behind the flashing up of P0543 code.
5. Electronic Control Unit - There can be some issues with the Electronic Control Unit due to which you may see P0543 code appearing over and over again. Visit us to buy best quality Electronic Control Unit online.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• Appearance of the check engine light
• There can be some issues in starting the car engine
• The overall cranking time might be longer than normal
• There can be rough idle during cold temperatures
• Engine stalling issues

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• It is very essential to replace the defective intake air heater relay
• Repair or replace the short, faulty, or open wiring, connectors, and other electrical components
• Carefully replace a burnt-out heating element
• Replacing a faulty intake air heater blower
• A loose intake air temperature sensor should be repaired
• Restore an open or shorted intake air heater harness
• Make sure that the flawed intake air heater is replaced properly
• Replace the powertrain control module

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Here are some steps which you should follow in order to diagnose this fault code:

• Carefully check the heater element, is it turning "ON"
• Inspect the blower motor, is it turning "ON"
• Visually inspect the circuit connections and wiring
• The condition of the air ducts for obvious defects should be visually inspected
• You must check the electrical connections for security and corrosion

Advanced steps become very vehicle specific and require the appropriate advanced equipment to perform accurately. These procedures require a digital multimeter and the specific technical references for the vehicle. Voltage requirements will differ based of the specific year, model and the diesel engine in the vehicle

Specific Checks:

On applications that have Mass Airflow sensors, the intake air temperature sensor is incorporated into the sensor body. Consult technical data to determine the correct pins associated with the sensor

Perform specific checks using the troubleshooting guidelines for the specific vehicle using the technical manual or online reference material. These steps will guide you through the process of checking the power and ground to each component within the intake air heater circuit in the proper sequence.

If the voltage is correct to a component that is not functioning, that component is most likely defective and requires replacement. If power is not available to operate the circuit, continuity checks may be needed to identify faulty wiring or components

Common Mistakes When Diagnosing The P0543 Code

• There are a lot of cases where the mechanics simply replace the air filters, or remove the air cleaner box for repairs during the process of tune up and would make a mistake of not reconnecting the intake air temperature sensor correctly
• Replacing the intake air heater relay or other parts can be a big mistake before carefully checking a bad connection