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P0067 Air Assisted Injector Control Circuit High

The OBD2 code P0067 indicates a problem with the air-assisted injector control circuit, specifically that the circuit is reading a high voltage or signal, which may affect the performance of the fuel injection system

Definition

The OBD2 code P0067 indicates a problem with the air-assisted injector control circuit, specifically that the circuit is reading a high voltage or signal, which may affect the performance of the fuel injection system

Common causes

  • Faulty air-assisted injector
  • Wiring issues (shorts or open circuits)
  • Poor electrical connections
  • Faulty engine control module (ECM)
  • Vacuum leaks
  • Faulty sensors (e.g., MAP or MAF sensor)
  • Corroded connectors
  • Software issues in the ECM

Common misdiagnoses

  • Faulty Mass Air Flow (MAF) Sensor
  • Vacuum Leaks
  • Throttle Position Sensor (TPS) Issues
  • Engine Control Module (ECM) Malfunction
  • Fuel Injector Problems
  • Wiring or Connector Issues
  • Intake Air Temperature (IAT) Sensor Faults
  • Fuel Pump or Fuel Pressure Regulator Issues

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the air-assisted injector control circuit. Look for signs of damage, corrosion, or loose connections

  3. 3. Pay special attention to the wiring harness for any fraying or breaks

  4. 4. Test the Air Assisted Injector

    If accessible, test the air-assisted injector itself for proper operation. This may involve checking the resistance of the injector coil and ensuring it meets manufacturer specifications

  5. 5. If the injector is faulty, it may need to be replaced

  6. 6. Check the Control Module

    Inspect the Engine Control Module (ECM) for any signs of damage or malfunction. Ensure that it is properly grounded and that all connections are secure

  7. 7. If necessary, perform a software update or reprogramming of the ECM

  8. 8. Measure Voltage and Ground

    Use a multimeter to measure the voltage at the injector connector while the engine is running. Ensure that the voltage is within the specified range

  9. 9. Check for a good ground connection at the injector and the control module

  10. 10. Inspect Related Components

    Check other components that may be related to the air-assisted injector system, such as the fuel pressure regulator, air intake system, and any sensors that may affect injector operation (e.g., MAF sensor, MAP sensor)

  11. 11. Perform a Visual Inspection of the Intake System

    Inspect the intake system for any leaks or blockages that could affect air flow and injector performance

  12. 12. Clear Codes and Test Drive

    After performing any repairs or adjustments, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  13. 13. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific make and model of the vehicle. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P0067 code