WOMS
P code powertrain Medium severity

P0660 Intake Air Temperature Sensor 1 Circuit

The OBD2 code P0660 indicates a malfunction in the Intake Air Temperature Sensor 1 circuit, which may involve issues such as an open or short circuit, or a problem with the sensor itself, affecting the engine's air...

Definition

The OBD2 code P0660 indicates a malfunction in the Intake Air Temperature Sensor 1 circuit, which may involve issues such as an open or short circuit, or a problem with the sensor itself, affecting the engine's air intake temperature readings

Common causes

  • Faulty intake air temperature sensor
  • Damaged wiring or connectors
  • Short circuit in the sensor circuit
  • Open circuit in the sensor circuit
  • Poor electrical connections
  • Corroded terminals
  • Faulty engine control module (ECM)

Common misdiagnoses

  • Faulty intake air temperature sensor
  • Wiring issues or short circuits
  • Engine control module (ECM) failure
  • Mass air flow sensor problems
  • Vacuum leaks
  • Throttle position sensor issues
  • Coolant temperature sensor faults
  • Air filter restrictions

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 the IAT Sensor

    Locate the IAT sensor, which is typically found in the intake manifold or air intake duct

  3. 3. Check for physical damage to the sensor or its connector

  4. 4. Ensure that the sensor is properly seated and connected

  5. 5. Check Wiring and Connectors

    Inspect the wiring harness and connectors for signs of wear, corrosion, or damage

  6. 6. Look for any loose connections or broken wires that could affect the circuit

  7. 7. Test the IAT Sensor

    Use a multimeter to test the resistance of the IAT sensor. Compare the readings to the specifications provided in the vehicle’s service manual

  8. 8. If the resistance is out of range, the sensor may be faulty and should be replaced

  9. 9. Check for Short Circuits or Open Circuits

    With the multimeter, check for continuity in the wiring between the IAT sensor and the ECM

  10. 10. Look for any short circuits to ground or power that could cause the code to trigger

  11. 11. Inspect the Engine Ground

    Ensure that the engine ground connections are clean and secure. Poor grounding can lead to various electrical issues, including sensor malfunctions

  12. 12. Check the ECM

    If all other components check out, there may be an issue with the ECM itself. This is less common but can happen

  13. 13. Ensure that the ECM is receiving the correct voltage and is functioning properly

  14. 14. Clear the Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes using the OBD-II scanner

  15. 15. Take the vehicle for a test drive to see if the code reappears

  16. 16. Consult a Professional

    If the issue persists after following these steps, it may be best to consult a professional mechanic or technician for further diagnosis.Additional Tips: - Always refer to the vehicle’s service manual for specific testing procedures and specifications. - Ensure that you are working in a safe environment and take necessary precautions when dealing with electrical components. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P0660 code