P2434 OBD Error Code: Problem & Solutions

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Are you looking for the common symptoms, diagnostic procedure, and causes of the P2434 error? Then you are at the right place. Faulty PCM is usually known as the secondary air injection system air flow/pressure sensor circuit. Intermittent/erratic bank 1. During the cold start of the engine, fresh air from the outside is sent by the secondary air injection system into the exhaust system. This extra air burns the exhaust emission that is highly rich which is produced as the engine warms up. To check the functionality of the AIR system, PCM will use an AIR pressure sensor. If an unlikely signal is sent by the AIR pressure sensor, the P2434 error will get stored. The pressure sensor is considered as a part of the AIR control solenoid in some vehicles.

During a cold startup, the secondary air injection (AIR) system helps to reduce the hydrocarbon exhaust emission. This takes place when the start-up engine coolant temperature lies between 50°C (41-122°F), and the intake air temperature (IAT) falls between 5-60°C (41-140°F). The AIR pump functions 5-60 seconds after the engine starts up.

The PCM initiates the AIR system by instantaneously giving grounds to the AIR pump and AIR valve relays. The internal contact of the relay is closed by this action. Both the AIR pump and the AIR control solenoid valve/pressure sensor assembly are tuned up, the pump runs and the control/shut-off valve is opened.

Through the open control/shut-off valve, fresh air is pumped into the pipes/hose and exhaust manifold by the AIR pump. The catalyst operation is initiated by the extra air which helps to reach the operating temperature very quickly. For a short duration, the AIR pump stays on after the control/shut-off valve is ordered OFF. The AIR pump will not run or start when it is commanded OFF unless the next vehicle starts. If the AIR system is stopped, the closed AIR control/shut-off valve will avoid air/exhaust flow in both directions.

The pressure at the AIR control solenoid valve/pressure sensor assembly inlet is monitored by the AIR system pressure sensor during the commanded ON/OFF states

What causes this problem with the Secondary Air Injection System Air Flow/Pressure Sensor Circuit Intermittent/Erratic Bank 1?

• The secondary air injection pump might be malfunctioning.
• Failure of the one-way check valve.
• Malfunctioning of the air control solenoid valve.
• Air pressure sensor might be broken.
• The electrical wires might turn out to be malfunctioning.
• The connectors might be loose or eroded.
• PCM might be faulty.

1. Powertrain Control Module - If you find the check engine light on the display dashboard, then the PCM is faulty. Replace it as soon as possible to avoid the P2434 error.
2. Engine Control Module - Does your car jump start on reverse polarity? It is an indication of damaged ECM. Repair / replace it soon to avoid P2434 error.
3. Secondary Air Injection Pump - Increased emission values during cold start of the vehicle can cause the malfunctioning of the secondary air injection pump. Replace it quickly.
4. Air Pressure Sensor - Does your engine stall very often? Then the air pressure sensor can be damaged. Replace it with a new air pressure sensor from PartsAvatar.
5. Air Control Solenoid Valve - Does your engine stall very often? Then the air control solenoid valve can be faulty. Avoid the P2434 error by replacing it as soon as possible.

We at Parts Avatar Canada care for our customers, and that’s why we will help you to diagnose P2434 code by listing out some major symptoms. They are mentioned below as follows

Common Symptoms

• Stalling of the engine when it is sluggish.
• The vehicle’s engine will decline to start.
• Noise from the secondary air injection system.
• Very less engine performance.
• Check engine light will be brightened.

Learn the ways with which you can correct this trouble code:

• The secondary air injection pump must be altered.
• The one-way check valve which might be damaged needs alteration.
• Fixing the defective air pressure sensor.
• The air control solenoid valve has to be changed.
• The connectors must be made free from corrosion.
• Fixing or replacing the broken wires.
• Altering the PCM.

However, if you face any issue then we have stocked a wide range of best-priced powertrain control module, secondary air injection pump, air pressure sensor, air control solenoid valve and more to help you out in fixing your car.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P2434 code to be stored:

• Start with the help of a troubleshooting procedure, and check for the correct Technical Service Bulletins (TSB's) specifically designed for your vehicle by year, model and transmission.
• You can save enough time in the long run as it guides you in the right path.
• The circuit will include several parts like the secondary air injection pump, check valve, pressure sensor, air control valve, and the PCM depending on the particular vehicle.
• Now, perform a visual inspection of the wires for injuries like scraping, rubbing, or burn spots.
• Check for the connector as well as its connection if they are properly secured and if there is any corrosion or damaged pins.
• You may also have to visually examine the connectors and its associated connections for protection, erosion and damaged pins.
• In this process, you must inspect all the wires and its connections to components which also contains the PCM.
• Validate the configuration of the circuit by verifying the particular tech data and make sure that every part is included in the circuit which may also contain the fuse or a fuse-able link in some applications.
• Make sure that the airflow is in one direction only by checking the check valve.
• Presence of ice during extremely cold weather in the secondary air injection pump is a sign that the one-way check valve is broken where the condensation from the exhaust will go into the pump.

Advanced Steps

• The advanced procedure varies for every vehicle as they are specific and need proper diagnostic tools to carry out the diagnosis.
• Use a digital multimeter and appropriate technical references for your vehicle to start the process.

Voltage checks

• Depending on the vehicle and the configuration of the circuit, the permitted range and reference voltage will vary.
• The correct order and troubleshooting charts are included in the specific technical data to help in the proper diagnosis.
• If there is no power source and ground during the process, the continuity test must be done to verify the reliability of the wires, connectors, and other components.
• Whenever the continuity test is done, the normal readings for wires and connectors should be set to 0 ohms resistance and the power must be detached from the circuit.
• Wires which are open, shorted or corroded is an indication for no resistance or continuity and it must be quickly fixed.

Common Mistakes When Diagnosing the P2434 Code

• Failure of the air control solenoid.
• Defective PCM.
• Faulty air system pressure sensor.
• An issue with electrical wires.