DTC P0506: Idle Control System RPM Lower Than Expected
- Turn the ignition switch ON (II).
- Clear the DTC with the HDS.
- Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
- Check for the these condition in the DATA LIST with the HDS:
- Engine coolant temperature above 158°F (70°C)
- Intake air temperature 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, let the engine idle 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 ), and also check for damage at 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 the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
- Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
- Check for the these condition in the DATA LIST with the HDS:
- Engine coolant temperature above 158°F (70°C)
- Intake air temperature 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.
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.
- 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, let the engine idle until a result comes on. If the screen indicates OUT OF CONDITION, go to step 12 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 ), and also check for damage at 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, changing 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, 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, let the engine idle until a result comes on. If the screen indicates OUT OF CONDITION, go to step 17 and recheck.