P0506

DTC P0506: idle Control System RPM Lower Than Expected

NOTE: If DTC P0511 is stored at the same time as DTC P0506, troubleshoot DTC P0511 first, then recheck for DTC P0506.

1. Turn the ignition switch ON (II).
2. Do the DTC CLEAR in the CLEAR MENU with the Honda PGM Tester or 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, then let it idle for 20 seconds.
4. Check the following data in the DATA LIST with the Honda PGM Tester or the HDS.
- Engine coolant temperature more than 158 °F (70 °C)
- Intake air temperature more than 32 °F (0 °C)
- Vehicle speed is 0 mph (0 km/h)
- FSS is CLOSED
- ST FUEL TRIM between 0.65 and 1.47

5. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the Honda PGM Tester or the HDS.

Does the screen indicate FAILED?

YES - Go to step 6.

NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. If it is EXECUTING, keep the engine idling until a result comes on. If the screen indicates Out of CONDITION, recheck with a different load condition (electrical, A/C, gear position, etc.), then go to step 3.

6. Do the DTC CLEAR in the CLEAR MENU with the Honda PGM Tester or the HDS.
7. Do the IACV TEST in the INSPECTION MENU with the Honda PGM Tester or the HDS.

Is the result OK?

YES - Check the A/C system and the power steering system, then go to step 10.

NO - Go to step 8.

8. Turn the ignition switch OFF.
9. Replace the IAC valve.
10. Turn the ignition switch ON (II).
11. Do the ECM/PCM RESET in the CLEAR MENU with the Honda PGM Tester or the HDS.
12. Do the ECM/PCM idle learn procedure.
13. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle for 20 seconds.
14. Check the following data in the DATA LIST with the Honda PGM Tester or the HDS.
- Engine coolant temperature more than 158 °F (70 °C)
- Intake air temperature more than 32 °F (0 °C)
- Vehicle speed is 0 mph (0 km/h)
- FSS is CLOSED
- ST FUEL TRIM between 0.65 and 1.47

15. Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P0506 is indicated, check for poor connections or loose terminals at the IAC valve and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.

NO - Go to step 16.

16. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the Honda PGM Tester or the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the IAC valve and the ECM/PCM, then go to step 1. If the screen indicates EXECUTING, keep the engine idling until a result comes on. If the screen indicates Out of CONDITION, recheck with a different load condition (electrical, A/C, gear position, etc.), then go to step 13.