What it means
The control circuit of the air-assisted fuel injector reports a generic fault. Air-assist atomization for cold-start or low-load conditions cannot be commanded.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
An air-assisted fuel injector uses a controlled air supply to help atomize fuel, particularly during cold starts or low-load operation. The engine control module monitors the injector's control circuit and sets this code when it detects a fault that prevents the air-assist actuator from being commanded correctly.
Common causes
Most likely first.
- Wiring or connector fault
- Air-assist actuator failed
Symptoms
- Check-engine light
- Rough running or hesitation
- Hard starting, especially when cold
How to diagnose it
- Check freeze-frame data and note whether the fault occurred during a cold start or low-load operation, then review any related injector or misfire codes.
- With the engine off, inspect the air-assist actuator connector and nearby wiring for loose terminals, corrosion, chafing, or heat damage.
- Check the air-assist hoses and passages for disconnection, blockage, or leaks that could prevent the commanded airflow.
- Use a scan tool, if supported, to command the air-assist actuator and observe whether it responds while monitoring circuit status.
- Test the actuator control circuit for power, ground, continuity, and shorts, then test the actuator itself against the manufacturer's specification.
Common fixes
- Reconnect a loose air-assist actuator connector or repair damaged wiring.
- Clear a restriction or repair a leak in the air-assist hose or passage.
- Clean and secure corroded terminals in the actuator circuit.
- Replace the air-assist actuator if circuit tests confirm it has failed.
Can I keep driving?
A short trip may be possible if the engine runs smoothly, but avoid driving if it stalls, misfires badly, or hesitates in traffic. A persistent fault can worsen cold-start operation and may increase emissions.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.