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DTC P0506 IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED

DTC P0506 IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED

DTC DETECTING CONDITION:


• Two consecutive driving cycles with fault

• GENERAL DESCRIPTION


TROUBLE SYMPTOM:


• Engine is difficult to start.

• Engine does not start.

• Erroneous idling

• Engine stalls.


Important

After repair or replacement of faulty parts, conduct Clear Memory Mode and Inspection Mode .


WIRING DIAGRAM:


CHECK ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Yes

• Inspect the relevant DTC using “List of Diagnostic Trouble Code (DTC)”.

•
Note

In this case, it is not necessary to inspect DTC P0506.



No


CHECK IDLE AIR CONTROL SOLENOID VALVE.

Turn the ignition switch to OFF.

Remove the idle air control solenoid valve from throttle body.

Using an air gun, force air into the idle air control solenoid valve by-pass air inlet. Confirm that forced air subsequently escapes from both main air passage and assist air passage.

Does air flow out?

Yes


No

Replace the idle air control solenoid valve. After replace,


CHECK IDLE AIR CONTROL SOLENOID VALVE DUTY RATIO.

Turn the ignition switch to ON.

Start the engine, and warm-up the engine.

Turn all accessory switches to OFF.

Read the data of idle air control solenoid valve duty ratio using Vehicle Diagnostic Interface or OBD-II general scan tool.

Note
• Vehicle Diagnostic Interface

For detailed operation procedures, refer to the “READ CURRENT DATA FOR ENGINE”.

• OBD-II general scan tool

For detailed operation procedures, refer to the OBD-II General Scan Tool Instruction Manual.


Is the duty ratio more than 60%?

Yes


No

END.


CHECK BY-PASS AIR LINE.

Turn the ignition switch to OFF.

Remove the idle air control solenoid valve from throttle body.

Remove the throttle body to intake manifold.

Using an air gun, force air into the solenoid valve installation area and throttle valve interior. Confirm that forced air subsequently escapes from both these areas.

Does air flow out?

Yes

Replace the idle air control solenoid valve.


No

Replace the throttle body.