DTC P0505: Notes

WARNING: This page is about a different car, the 2007 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION AND POSSIBLE CAUSE (DTC P0505)

DTC P0505	Idle speed control system problem
DETECTION CONDITION	The PCM cannot control idle speed toward target idle speed while KOER self test.
POSSIBLE CAUSE	Drive-by-wire control system malfunction Air cleaner element clogged Air intake passage clogged A/C relay control circuit malfunction Generator control circuit malfunction Low engine compression (Over capacity of blow-by gas) PCM malfunction