DTC P0506: Idle Control System RPM Lower Than Expected
- Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
- Clear the DTC with the HDS
- Start the engine Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 20 seconds or more
- Check for these conditions in the DATA LIST 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 73 and 1 47
- FSS is CLOSED
- 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
- Remove the intake air duct from the throttle body
- 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 the power steering system, then go to step 17
- Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION )
- Reset the PCM with the HDS
- Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE )
- Start the engine Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 20 seconds or more
- Check for these conditions in the DATA LIST 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 73 and 1 47
- FSS is CLOSED
- Check for Pending or Confirmed DTCs with the HDS
Is DTC P0506 indicated?
YES -Go to step 1 and recheck
NO -Go to step 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 Pending or Confirmed DTCs were indicated in step 13, go to the indicated DTC's troubleshooting
NO -If the screen indicates FAILED, check the A/C system and/or the 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 12
- Remove the intake air duct from the throttle body
- 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
- Recheck with different load conditions (turn on the headlights, blower motor, the rear window defogger and/or the A/C, change the gear position, etc)
- 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 the 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 12