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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 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 without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Confirm under these DATA LIST parameter conditions with the HDS:
    • ECT SENSOR 1 above 158°F (70°C)
    • IAT SENSOR above 32°F (0°C)
    • VSS is 0 mph (0 km/h)
    • 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 intake air duct from the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).
  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  17.

  8. Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).
  9. Reset the ECM/PCM with the HDS.
  10. Do ECM/PCM IDLE LEARN PROCEDURE  .
  11. Start the engine. Hold the engine speed at 3,000 rpm 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:
    • ECT SENSOR 1 above 158°F (70°C)
    • IAT SENSOR above 32°F (0°C)
    • VSS is 0 mph (0 km/h)
    • 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  19.

    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 DTCs troubleshooting.

    NO  - If the screen indicates FAILED, go to step  19. Check the A/C system and/or power steering system, then 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  11.

  15. Remove the intake air duct from the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).
  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  12.

  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 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:
    • ECT SENSOR 1 above 158°F (70°C)
    • IAT SENSOR above 32°F (0°C)
    • VSS is 0 mph (0 km/h)
    • 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 DTCs 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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