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DTC P0519: Idle Speed Performance: Testing

  1. Ignition on, engine not running. With the DRBIII® scan tool, read DTCs and record the related freeze frame data. Is the Good Trip Counter displayed and equal to zero? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Remove the IAC motor. Inspect the IAC motor and passages for any obstructions or damage to motor. Were any problems found? If yes, repair as necessary. If no, go to next step.
  3. Start the engine. Inspect the vehicle for external vacuum leaks. Inspect the engine for internal vacuum leaks. Were any vacuum leaks found? If yes, repair the vacuum leak as necessary. If no, go to next step.
  4. Inspect the air induction system for the following problems. Restrictions like, dirty air cleaner, foreign material trapped in the air intake tube, etc. leaks, air intake tube connection, air cleaner housing, etc. Were any problems found? If yes, repair or replace as necessary. If no, go to next step.
  5. Inspect the throttle body plate carbon build-up or other restrictions. Inspect the throttle linkage for binding and smooth operation. Ensure the throttle plate is resting on the stop at idle. Were any problems found? If yes, repair or replace as necessary. If no, the test is complete.
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