P0067
UniversalAir Assisted Injector Control Circuit or Circuit High
Medium SeverityThis code indicates an issue with the electrical control circuit for the air assisted injector. When this circuit has an abnormally high voltage, it can prevent the injector from operating correctly, leading to improper fuel atomization and delivery.
⚠️ Before You Begin (Safety First)
Always ensure the engine is off and cool before beginning any work. Disconnect the battery's negative terminal to prevent electrical shocks or damage to the vehicle's electrical system. Be cautious when working around fuel lines, as fuel is highly flammable. Wear appropriate personal protective equipment, including safety glasses and gloves.
Common Symptoms
- Check Engine Light illuminated
- Rough idle
- Engine misfires
- Reduced fuel economy
- Poor engine performance
- Increased emissions
Common Causes
- Faulty air assisted injector
- Open or short in the air assisted injector control circuit
- Corroded or loose electrical connectors
- Faulty Engine Control Module (ECM), though rare
Frequently reported on: General/Universal
Diagnostic Steps
- Connect an OBD-II scanner to confirm the P0067 code and check for any other related codes.
- Visually inspect the wiring harness and connectors leading to the air assisted injector for any signs of damage, fraying, corrosion, or loose connections.
- Using a multimeter, check for continuity and proper voltage at the injector's electrical connector, following your vehicle's specific wiring diagrams.
- If wiring appears intact, perform a resistance test on the air assisted injector itself. Compare readings to manufacturer specifications.
- If tests indicate a faulty injector or circuit, replace the faulty component. Clear the code and test drive the vehicle.
👨🔧 When to Call a Professional
If you have verified that the wiring and connections to the air assisted injector are sound, and the code persists, it's advisable to consult a professional. Diagnosing internal injector faults or advanced electrical issues often requires specialized tools and expertise.
Commonly Asked Questions
What is an air assisted injector?
An air assisted injector uses a small amount of compressed air to help atomize fuel more finely as it enters the combustion chamber, improving fuel efficiency and reducing emissions.
Can I drive with a P0067 code?
While the car might run, it's not recommended to drive for an extended period. The issue can lead to reduced fuel economy, increased emissions, and potential engine damage due to improper fuel delivery.
How do I find the air assisted injector in my car?
The location varies by vehicle, but it's typically found on or near the intake manifold, often integrated with the fuel injector system. Refer to your vehicle's service manual for its exact placement.
Is P0067 related to regular fuel injectors?
Yes, it is related to a specific type of fuel injector that utilizes air assistance. The control circuit specifically pertains to the operation of this air-assisted function, which can impact the overall fuel injection process.
Will clearing the code fix the problem?
Clearing the code will turn off the Check Engine Light, but it will not fix the underlying mechanical or electrical issue. The code will likely return if the fault is not repaired.