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DTC P0506: Idle Control System RPM Lower Than Expected

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 RPM (min-1 ) without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Check under these DATA LIST parameter conditions with the HDS:
    • Engine Coolant Temperature (ECT SENSOR 1) above 70°C (156°F)
    • IAT SENSOR above 0°C (32°F)
    • VSS is 0 km/h (0 mph)
    • ST FUEL TRIM between 0.69-1.47
    • FSS is CLOSED
  5. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the HDS.

    Does the screen indicate FAILED? 

    YES  -Go to step 6.

    NO  -If the screen indicates PASSED, go to step  15. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step  4 and recheck.

  6. Remove the air intake duct from the throttle body (see step 3 on REMOVAL-K20Z2 ).
  7. Check for dirt, carbon, or damage in the throttle bore.

    Is there dirt, carbon, or damage in the throttle bore? 

    YES  -If there is dirt or carbon, clean the throttle body (see THROTTLE BODY CLEANING ). Also check for damage to the air cleaner element (see AIR CLEANER ELEMENT INSPECTION/REPLACEMENT ), then go to step  9. If there is damage in the throttle bore, go to step 8.

    NO  -Check the A/C system or power steering system, then go to step  9.

  8. Replace the throttle body; K20Z2 engine (see THROTTLE BODY REMOVAL/INSTALLATION ), K20Z3 engine (see K20Z3 ENGINE ).
  9. Reset the ECM/PCM with the HDS.
  10. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE  ).
  11. Start the engine. Hold the engine speed at 3,000 RPM (min-1) without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  12. Check under these DATA LIST parameter conditions with the HDS:
    • Engine Coolant Temperature (ECT SENSOR 1) above 70°C (156°F)
    • IAT SENSOR above 0°C (32°F)
    • VSS is 0 km/h (0 mph)
    • ST FUEL TRIM between 0.69-1.47
    • FSS is CLOSED
  13. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P0506 indicated? 

    YES  -Go to step  1 and recheck.

    NO  -Go to step 14.

  14. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED? 

    YES  -Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step  13, go to the INDICATED DTC'S TROUBLESHOOTING .

    NO  -If the screen indicates FAILED, go to step  19. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step  12.

  15. Remove the air intake duct from the throttle body (see step 3 on REMOVAL-K20Z2 ).
  16. Check for dirt, carbon, or damage in the throttle bore.

    Is there dirt, carbon, or damage in the throttle bore? 

    YES  -If there is dirt or carbon, clean the throttle body (see THROTTLE BODY CLEANING ). Also check for damage to the air cleaner element (see AIR CLEANER ELEMENT INSPECTION/REPLACEMENT ), then go to step  9. If there is damage in the throttle bore, go to step  8.

    NO  -Go to step 17.

  17. Recheck with different load conditions (turn on the headlights, blower motor, rear window defogger and/or A/C, change the gear position, etc.).
  18. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED? 

    YES  -Intermittent failure, the system is OK at this time.

    NO  -If the screen indicates FAILED, check the A/C system and/or power steering system, then go to step  1 and recheck. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step  17.

  19. Update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), or substitute a known- good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
  20. Start the engine. Hold the engine speed at 3,000 RPM (min 1) without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  21. Check under these DATA LIST parameter conditions with the HDS:
    • Engine Coolant Temperature (ECT SENSOR 1) above 70°C (156°F)
    • IAT SENSOR above 0°C (32°F)
    • VSS is 0 km/h (0 mph)
    • ST FUEL TRIM between 0.69-1.47
    • FSS is CLOSED
  22. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P0506 Indicated? 

    YES  -Check for poor connections or loose terminals at the throttle body and the ECM/PCM. If the ECM/PCM was updated, substitute a known- good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  20. If the ECM/PCM was substituted, go to step  1.

    NO  -Go to step 23.

  23. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED? 

    YES  -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ). If any other Temporary DTCs or DTCs were indicated in step  22, go to the INDICATED DTC'S TROUBLESHOOTING .

    NO  -If the screen indicates FAILED, check for poor connections or loose terminals at the throttle body and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  20. If the ECM/PCM was substituted, go to step  1. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step  20.

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