DTC P0506: Idle Control System RPM Lower Than Expected
- Turn the ignition switch to ON (II).
- Clear the DTC with the HDS.
- Start the engine. Hold the engine speed at 3,000 RPM without load (in P or N) until the radiator fan comes on, then let it idle 20 seconds.
- Check under these conditions in the DATA LIST with the HDS:
- ECT SENSOR 1 above 158°F (70°C)
- IAT SENSOR above 32°F (0°C)
- Vehicle speed 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 HDS indicates OUT OF CONDITION, go to step 4 and recheck.
- Remove the air intake duct from the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).
- 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.
- Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).
- Reset the PCM with the HDS.
- Do PCM IDLE LEARN PROCEDURE .
- Start the engine. Hold the engine speed at 3,000 RPM without load (in P or N) until the radiator fan comes on, then let it idle 20 seconds.
- 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)
- Vehicle speed is 0 mph (0 km/h)
- ST FUEL TRIM between 0.73 and 1.47
- FSS is CLOSED
- Check for Temporary DTCs or 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 Temporary DTCs or DTCs were indicated in step 13, go to the indicated DTCs troubleshooting. ■
NO - If the screen indicates FAILED, 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 HDS indicates OUT OF CONDITION, go to step 12.
- Remove the air intake duct from the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).
- 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, rear window defogger and/or 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 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.