WOMS
P code powertrain Medium severity

P1190 Calibration Resistor Out Of Range

The OBD2 code P1190 indicates that the calibration resistor in the vehicle's fuel system is out of its specified range, which can affect fuel delivery and engine performance

Definition

The OBD2 code P1190 indicates that the calibration resistor in the vehicle's fuel system is out of its specified range, which can affect fuel delivery and engine performance

Common causes

  • Faulty calibration resistor
  • Open or shorted wiring in the calibration circuit
  • Poor electrical connections or corroded terminals
  • Malfunctioning engine control module (ECM)
  • Incorrectly installed or damaged sensors
  • Issues with the intake air temperature sensor
  • Problems with the mass air flow (MAF) sensor
  • Faulty fuel temperature sensor

Common misdiagnoses

  • Faulty oxygen sensor
  • Fuel pressure issues
  • Air intake leaks
  • Mass air flow sensor problems
  • Engine control module (ECM) failure
  • Wiring or connector issues
  • Throttle position sensor malfunction
  • Vacuum leaks

Troubleshooting steps

  1. 1. Check the Vehicle's Service Manual

    Always refer to the specific service manual for your vehicle to understand the exact diagnostic procedures and specifications

  2. 2. Inspect Wiring and Connectors

  3. 3. Check the wiring harness and connectors associated with the IAT and MAP sensors for any signs of damage, corrosion, or loose connections

  4. 4. Ensure that all connectors are securely attached and free of dirt or moisture

  5. 5. Test the Sensors

  6. 6. Use a multimeter to test the resistance of the IAT and MAP sensors. Compare the readings to the specifications in the service manual

  7. 7. If the readings are out of range, the sensor may need to be replaced

  8. 8. Check for Short Circuits or Open Circuits

  9. 9. Inspect the wiring for any short circuits to ground or open circuits that could affect sensor readings

  10. 10. Use a multimeter to check for continuity in the wiring

  11. 11. Inspect the Calibration Resistor

  12. 12. If applicable, check the calibration resistor itself for proper resistance. This may involve checking the resistor's specifications and ensuring it is functioning correctly

  13. 13. Clear the Code and Test Drive

  14. 14. After performing any repairs or replacements, clear the trouble code using an OBD-II scanner

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

  16. 16. Check for Other Codes

  17. 17. Look for any other related trouble codes that may provide additional context for the issue

  18. 18. Address any other codes before focusing solely on P1190

  19. 19. Inspect the Engine Control Module (ECM)

  20. 20. In rare cases, the issue may be related to the ECM itself. Check for software updates or reprogramming if necessary

  21. 21. Consult a Professional

  22. 22. If the issue persists after performing the above steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P1190 code