P0506

DTC P0506: Idle Control System RPM Lower Than Expected

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 with no load (in Park or neutral) until the radiator fan comes on.
4. Test under following conditions:
- Engine coolant temperature more than 156 °F (70 °C)
- Intake air temperature more than 32 °F (0 °C)
- More than 15 seconds elapsed after starting the engine
- Vehicle not moving
- Fuel trim between 0.73 and 1.47
- Fuel feed back in closed loop

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 the condition continually 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.
7. Check for dirt, carbon and damage at the throttle bore.

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

YES - If there is dirt or carbon, clean the throttle body, and also check for damage at the air cleaner element, 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 1 and recheck.

8. Replace the throttle body,then go to step 9.
9. Reset the PCM with the HDS.
10. Do the PCM idle learn procedure.
11. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on.
12. Test under following conditions:
- Engine coolant temperature more than 156 °F (70 °C)
- Intake air temperature more than 32 °F (0 °C)
- More than 15 seconds elapsed after starting the engine
- Vehicle not moving
- Fuel trim between 0.73 and 1.47
- Fuel feed back in closed loop

13. Check for temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P0506 is indicated, go to step 1 and recheck. If any other temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

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.

NO - If the screen indicates FAILED, go to step 1 and recheck. If the screen indicates EXECUTING, keep the condition continually until a result comes on. If the screen indicates OUT OF CONDITION, go to step 12 and recheck.

15. Remove the intake air duct from the throttle body.
16. Check for dirt, carbon and damage at the throttle bore.

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

YES - If there is dirt or carbon, clean the throttle body, and also check for damage at the air cleaner element, 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 condition (turn on the headlights, blower motor, rear window defogger and/or A/C, changing the shift lever position, etc.)
18. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete.

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 the condition continually until a result comes on. If the screen indicates OUT OF CONDITION, go to step 17 and recheck.