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DTC P0505-00: IAC System Problem: Notes

DTC P0505:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0505:00 IAC system problem
DETECTION CONDITION
  • The PCM cannot control idle speed toward target idle speed while KOER self test.

    Diagnostic support note

  • The check engine light does not illuminate.
  • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.
  • The DTC is not stored in the PCM memory.
FAIL-SAFE FUNCTION -
POSSIBLE CAUSE
  • Improper operation of drive-by-wire control system
  • A/C relay control circuit malfunction
  • Generator control circuit malfunction
  • Air cleaner element restricted
  • Air intake passage blockage (throttle body passage blockage)
  • Low engine compression (over capacity of blow-by gas)
  • PCM malfunction
SYSTEM WIRING DIAGRAM -