Idle Control System Malfunction

FAULT ID
P0505

TITLE
Idle Control System Malfunction

BACKGROUND
- If there is a malfunction of the Idle Air Control (IAC) system, the actual engine speed will not be identical to the target engine speed.
- The engine control module checks the difference between the actual engine speed and the target engine speed.

RANGE OF CHECK & SET CONDITIONS
After the engine has warmed up, the difference between the actual engine speed and the target engine speed exceeds the specified value.

EFFECT
Limp-in

PROBABLE CAUSES
- Idle air control motor failed.
- Open or shorted idle air control motor circuit, or loose connector.
- Engine control module failed.