P0067 Air Assisted Injector Control Circuit High
OBD-II Trouble Code Technical Description
Air Assisted Injector Control Circuit High
What does that mean?
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles that have an air assisted fuel injector. Brands of vehicles may include but are not limited to Subaru, Jaguar, Chevy, Dodge, VW, Toyota, Honda, etc. but mainly only shows up on Subaru and Jaguar vehicles. Although generic, the specific repair steps may vary depending on make/model/engine.
The Air Assisted injector is similar a normal fuel injector. Just like the name implies, it uses air to assist in atomizing the fuel that is being injected/sprayed. In most cases, this particular injector is used to help with cold starts. When your engine is cold, It requires a richer air/fuel mixture (more fuel) in order to start.
The atomization that happens when air is introduced to a normal injector is desired simply because it aids in a more evenly distributed spray. This matters because generally speaking, these systems only use one injector mounted to the throttle body or intake and the atomized fuel spray is distributed between X number cylinders.
The ECM (engine control module) illuminates the check engine light with P0067 and associated codes when it monitors a condition outside of a specific range within the Air Assisted Injector's circuit. Generally speaking this is an electrical issue but sometime an internal malfunction within the injector itself may cause this condition.
P0067 Air Assisted Injector Control Circuit High code is set when the ECM monitors one or more high electrical value within the circuit. This air assisted injector control DTC is closely related to P0065 and P0066.
What is the severity of this DTC?
I would say the severity of this code is moderate to low. Reason being, it will not affect overall performance of engine at normal operating temperature. That being said, it will need to be addressed eventually as consistent cold starts with a possibly lean mixture could cause serious damage in the long run.
What are some of the symptoms of the code?
Symptoms of a P0067 engine code may include:
Hard to start when engine is cold Smoking Poor performance when cold Engine misfiring Poor fuel mileageWhat are some of the common causes of the code?
Causes for this code may include:
Broken or damaged wiring harness Vacuum leak within injector or in hoses/clamps Fuse/relay defective Air Assisted Fuel Injector defective ECM issue Pin/connector problem. (e.g. corrosion, overheating, etc.)What are some troubleshooting steps?
Be sure to check for technical service bulletins (TSBs) for your vehicle. Getting access to a known fix can save you time and money during diagnosis.
Tools
Whenever you are working with electrical systems, some of the basic tools that are a good idea to have are:
OBD code reader Multimeter Basic socket set Basic ratchet and wrench sets Basic screwdriver set Rag/shop towels Battery terminal cleaner Service manualSafety Tips
Let engine cool Chalk wheels Wear PPE (Personal protective equipment)Basic Step #1
Refer to your service manual for the location of the injector on your particular make and model. Most times, you can find the injector mounted to the throttle body itself. Sometimes the vacuum lines/gaskets around the injector leak causing it to perform outside of the desired range, pay special attention here as this would be the best case scenario. Fixing vacuum hoses/gaskets are generally inexpensive and easy to repair. With the engine running, listen for any abnormal whistle noises around theses hoses indicating a leak. If you know how to operate a vacuum gauge, you will want to monitor the vacuum within the intake system while the engine
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