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

1. - 

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 stall

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .

   Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAG)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC other than P0506 displayed? (Current malfunction)

   Yes:  Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>DIAGNOSTIC TROUBLE CODE (DTC) .

   No:  Go to  2.

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) (H4DO (EXCEPT FOR HEV))>AIR CLEANER ELEMENT .

      No:  Go to  3.

3. CHECK ELECTRONIC THROTTLE CONTROL  .
   1. Remove the electronic throttle control. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>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 diagnosis o (DTC P2101. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P2101 THROTTLE ACTUATOR "A" CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE .