P0065, P0066, and P0067: Air Assisted Injector Control

DTC codes P0065, P0066, and P0067 are all related to the air assisted injector control circuit. The air assisted injector control circuit is used to heat up the air assisted injector before it reaches operating temperature. This is important because the air assisted injector is more accurate when it is warm.

• P0065 Air assisted injector control range / performance: is set when the powertrain control module (PCM) detects a problem with the air assisted injector control circuit that is causing the air assisted injector to operate outside of its normal range.
  
• P0066 Air assisted injector control circuit or circuit low: is set when the PCM detects a problem with the air assisted injector control circuit that is causing the air assisted injector to receive a lower voltage than it should.

• P0067 Air assisted injector control circuit high: is set when the PCM detects a problem with the air assisted injector control circuit that is causing the air assisted injector to receive a higher voltage than it should.

What are the causes of these DTC codes?

There are a number of possible causes for DTC codes P0065, P0066, and P0067, including:

• Faulty or damaged air assisted injector: This could be due to wear and tear, contamination, or damage from a foreign object. A faulty air assisted injector will not be able to heat up properly, which can lead to inaccurate fuel delivery and other problems.
• Faulty or damaged air assisted injector control valve: This valve regulates the flow of fuel to the air assisted injector. A faulty control valve can cause the air assisted injector to receive too much or too little fuel, which can also lead to inaccurate fuel delivery.
• Short circuit in the air assisted injector control circuit: This can be caused by a damaged wire or connector. A short circuit can cause the air assisted injector to receive too much voltage, which can damage it.
• Open circuit in the air assisted injector control circuit: This can be caused by a broken wire or connector. An open circuit can prevent the air assisted injector from receiving any voltage, which will prevent it from working properly.
• Problem with the PCM: The PCM is the computer that controls the engine. If the PCM is faulty, it may not be able to properly control the air assisted injector control circuit.

What are the symptoms of these DTC codes?

The symptoms of DTC codes P0065, P0066, and P0067 can vary depending on the specific cause of the problem. However, some common symptoms include:

 Here are the symptoms commonly associated with these DTC codes:

1. Illuminated Check Engine Light (CEL): One of the most common symptoms of these DTC codes is the illumination of the Check Engine Light on your vehicle's dashboard. When the engine control module (ECM) detects an issue with the Air Assisted Injector Control Circuit, it triggers the CEL to alert you to a problem.
2. Reduced Engine Performance: You may experience a decrease in engine performance, including reduced power and acceleration. This is because the ECM may limit engine functions to prevent further damage or emissions issues.
3. Rough Idling: Your vehicle's engine may idle roughly or inconsistently. You might notice uneven or shaky idling when the vehicle is at a stop.
4. Stalling: In more severe cases, your vehicle might stall while idling or even while driving, which can be dangerous and lead to safety concerns.
5. Decreased Fuel Efficiency: These DTC codes can affect your vehicle's fuel efficiency negatively. A decrease in miles per gallon (MPG) can be a noticeable symptom.
6. Emissions Problems: Issues with the Air Assisted Injector Control Circuit can impact your vehicle's emissions. You may fail emissions tests or produce higher levels of harmful pollutants.
7. Hesitation and Surging: Your vehicle might hesitate when you accelerate or experience surging, where it accelerates and decelerates unevenly.
8. Hard Starting: You may encounter difficulty starting your vehicle, especially when the engine is cold.
9. Visible Damage: Sometimes, physical damage to the wiring or connectors associated with the Air Assisted Injector Control Circuit can be observed upon inspection.

How to diagnose these DTC codes?

If you are experiencing any of the symptoms listed above, it is important to have your vehicle diagnosed by a qualified automotive technician. The technician will use a scan tool to retrieve the DTC codes and then perform a thorough visual inspection of the air assisted injector and air assisted injector control circuit.

To diagnose DTC codes P0065, P0066, and P0067, the technician may perform the following tests:

• Check the air assisted injector for damage or corrosion
• Test the air assisted injector control valve for proper operation
• Check the air assisted injector control circuit for resistance and continuity
• Check for any short circuits or open circuits in the air assisted injector control circuit
• Test the PCM for proper operation

How to repair these DTC codes?

Once the cause of the DTC code has been diagnosed, the technician can recommend the appropriate repairs. If the air assisted injector or air assisted injector control valve is faulty, it will need to be replaced. If there is a short circuit or open circuit in the air assisted injector control circuit, the short or open circuit must be repaired. If the PCM is faulty, it may need to be replaced.

How to prevent these DTC codes from happening again?

There are a few things you can do to help prevent DTC codes P0065, P0066, and P0067 from happening again:

• Keep your air filter clean
• Use high-quality fuel
• Have your vehicle serviced regularly

By following these tips, you can help keep your vehicle running smoothly and reduce the chances of developing DTC codes.

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