WOMS
P code powertrain Medium severity

P1516 IMRC Input Error (Bank 1)

The OBD2 code P1516 indicates a malfunction in the Intake Manifold Runner Control (IMRC) system for Bank 1, typically related to the position sensor or actuator not functioning correctly

Definition

The OBD2 code P1516 indicates a malfunction in the Intake Manifold Runner Control (IMRC) system for Bank 1, typically related to the position sensor or actuator not functioning correctly

Common causes

  • Faulty Intake Manifold Runner Control (IMRC) actuator
  • Damaged or disconnected vacuum lines
  • Faulty IMRC position sensor
  • Electrical issues (wiring or connectors)
  • Intake manifold blockage or restriction
  • Faulty engine control module (ECM) or software issues
  • Carbon buildup in the intake manifold
  • Malfunctioning throttle body

Common misdiagnoses

  • Faulty intake manifold runner control (IMRC) actuator
  • Vacuum leaks
  • Throttle body issues
  • Faulty mass air flow (MAF) sensor
  • Wiring or connector issues
  • Engine control module (ECM) problems
  • Faulty intake manifold pressure sensor
  • Fuel delivery 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. Addressing any related codes can help in diagnosing the issue

  2. 2. Inspect the IMRC System

    Visual Inspection: Check the IMRC actuator and linkage for any signs of damage, disconnection, or obstruction

  3. 3. Vacuum Lines

    Inspect any vacuum lines connected to the IMRC system for leaks, cracks, or disconnections

  4. 4. Test the IMRC Actuator

    Functionality Test: Manually operate the IMRC actuator (if possible) to see if it moves freely and responds correctly

  5. 5. Electrical Testing

    Use a multimeter to check the voltage and ground at the IMRC actuator connector. Ensure that the actuator is receiving the correct signals from the ECM

  6. 6. Check the Wiring and Connectors

    Inspect the wiring harness and connectors related to the IMRC system for any signs of damage, corrosion, or loose connections. Repair or replace as necessary

  7. 7. Inspect the Intake Manifold

    Check the intake manifold for any blockages or carbon buildup that could affect airflow and the operation of the IMRC system

  8. 8. Test the ECM

    If all other components check out, the issue may lie with the engine control module itself. Ensure that the ECM is functioning correctly and is not sending erroneous signals

  9. 9. Clear Codes and Test Drive

    After performing 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

  10. 10. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or technician who has experience with your vehicle's make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue causing the P1516 code