DTC Troubleshooting: P0506 (14)

DTC P0506:  Idle Control System RPM Lower Than Expected

NOTE: If some of DTCs are stored at the same time as DTC P0506, troubleshoot the DTC (s) other than P0506 first, then recheck the P0506.

1.Turn the ignition switch ON (II).

2.Do the DTC CLEAR in the CLEAR MENU with the HDS.

3.Start the engine. Hold the engine speed at 3,000 rpm (min-1) with no load (in neutral) until the radiator fan comes on, then let it idle for 1 minute.

4.Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Is DTC P0506 indicated?


YES - Go to 5.


NO - Intermittent failure, system is OK at this time.n


5.Turn the ignition switch ON (II).

6.Remove the air cleaner.

7.Check for sludge or carbon on the throttle bore.

Is there sludge or carbon on the throttle bore?


YES - Do the throttle body cleaning, then go to 11.


NO - Go to 8.


8.Check for damage on the throttle bore.

Is there throttle body damaged?


YES - Go to 9.


NO - Check the A/C system, then go to 11.

9.Turn the ignition switch OFF.

10.Replace the throttle body.

11.Install the air cleaner.

12.Turn the ignition switch ON (II).

13.Do the ECM RESET in the CLEAR MENU with the HDS.

14.Do the ETCS learn procedure.

15.Start the engine. Hold the engine speed at 3,000 rpm (min-1) with no load (in neutral) until the radiator fan comes on, then let it idle for 1 minute.

16.Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0506 is indicated, check for sludge or carbon on the throttle bore again, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.


NO - Troubleshooting is complete.n