DTC P0506 - Idle Control System Rpm Lower Than Expected -

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:
- Two consecutive driving cycles with malfunction
TROUBLE SYMPTOM:
- Engine is difficult to start.
- Engine does not start.
- Erroneous idling
- Engine stalls.

CAUTION: After repair or replacement of malfunctioning parts, conduct Clear Memory Mode < Ref. to OPERATION , CLEAR MEMORY MODE > and INSPECTION MODE < Ref. to OPERATION , INSPECTION MODE. >

WIRING DIAGRAM:

Fig 1: Idle Control System Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK ANY OTHER DTC ON DISPLAY.	Is any other DTC displayed?	Inspect the relevant DTC using "List of Diagnostic Trouble Code (DTC)". < Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > NOTE: In this case, it is not necessary to inspect DTC P0506.	Go to step 2.
2 CHECK AIR BY-PASS LINE. Turn ignition switch to OFF. Remove idle air control solenoid valve from throttle body. < Ref. to REMOVAL , IDLE AIR CONTROL SOLENOID VALVE. > Remove throttle body from intake manifold. < Ref. to REMOVAL , THROTTLE BODY. > Using an air gun, force air into idle air control solenoid valve installation area. Confirm that forced air subsequently escapes from throttle body interior.	Does air flow out?	Replace idle air control solenoid valve. < Ref. to INSTALLATION , IDLE AIR CONTROL SOLENOID VALVE. >	Replace throttle body. < Ref. to INSTALLATION , THROTTLE BODY. >