DTC P0506 (ISC_RLOW): Idle Control System Rpm Lower Than Expected
- Connect SSM. Retrieve DTC(s). If DTC P0505 exists, diagnose DTC P0505 only. If DTC P0505 does not exist, go to next step.
- Start and allow engine to idle. If there is clogging in by-pass line between by-pass hose and intake duct, repair by-pass line. If clogging is not present, replace idle air control (IAC) solenoid.