P0506

DTC PO5O6
IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED (ISC - L)

Description
- Idle air control solenoid valve consists of an air cut valve, duty control valve, intake air passage and a coolant passage.
- Air cut valve contains a bimetallic substance which responds to coolant temperature, and a duty control valve which is operated by a signal sent from Engine Control Module (ECM).
- When engine coolant temperature is low, air cut valve is fully opened by the action of the bimetallic substance so that the air flow required for low engine coolant temperatures is maintained.
- ECM controls duty control valve to bring the operating engine speed as close to preset idle speed as possible.

DTC Detecting Condition
Two consecutive trips with fault.

Trouble Symptom
- Engine is difficult to start.
- Engine does not start.
- Erroneous idling.
- Engine stalls.





1. Check DTC P0505 on display.

2. Check air intake system.
a. Turn ignition switch to "ON".
b. Start engine and idle it.
[CHECK]: Is clogging the by-pass tine between by-pass hose and intake duct?
[YES]: Repair the by-pass line.
[NO]: Replace idle air control solenoid valve.