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 stall

1. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC other than P0506 displayed? (Current code)

   Yes  : Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>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)>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)>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 for DTC P2101. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P2101 THROTTLE ACTUATOR "A" CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE .