P0506 MITSUBISHI - Idle Control System RPM Lower Than Expected
- Dirty throttle body
- Electric throttle control actuator misadjusted or damaged
- Faulty Electric throttle control actuator
- Intake air leak
- Poor electrical connection to the Intake Air Control (IAC) valve
If there are no intake leaks, clean throttle body, adjust engine idle and erase engine code. If the code comes back you may have to replace the Electric Throttle Control Actuator (Motor) to repair the problem.