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DTC P0505 [LF]: Notes

DTC P0505 (LF) DETECTION CONDITION AND POSSIBLE CAUSE

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

Diagnostic support note 
  • The MIL does not illuminate.
  • FREEZE FRAME DATA (Mode 2/Mode 12) is not available.
  • The DTC is not stored in the PCM memory.
POSSIBLE CAUSE 
  • Drive-by-wire control system malfunction
  • A/C relay control circuit malfunction
  • Generator control circuit malfunction
  • Air cleaner element clogged
  • Air intake passage clogged
  • Low engine compression (over capacity of blow-by gas)
  • PCM malfunction
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