DTC P0506: Idle Control System Rpm - Lower Than Expected: Notes

DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

Trouble symptom:

Hard to start the engine.
Engine does not start.
Improper idling
Engine stalls.

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Clear Memory Mode>OPERATION , and inspection mode Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Inspection Mode>PROCEDURE .

CHECK DTC .
Read the engine DTC using the Subaru Select Monitor or general scan tool. Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Read Diagnostic Trouble Code (DTC) .

Is DTC other than P0506 displayed? (Current malfunction)

Yes: Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>List of Diagnostic Trouble Code (DTC) .

No: Go to 2.
CHECK AIR CLEANER ELEMENT .
1. Turn the ignition switch to OFF.
2. Check the air cleaner element.
Is there excessive clogging on air cleaner element?

Yes: Replace the air cleaner element. Ref. to INTAKE (INDUCTION) (EXCEPT FOR STI)>Air Cleaner Element .

No: Go to 3.
CHECK ELECTRONIC THROTTLE CONTROL .
1. Remove the electronic throttle control. Ref. to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>Throttle Body>REMOVAL .
2. Check the electronic throttle control.
Are foreign matter found inside electronic throttle control?

Yes: Remove foreign matter from electronic throttle control.

No: Perform the DTC diagnosis. Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC P2101 THROTTLE ACTUATOR "A" CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE .