P0506
DTC P0506 IDLE AIR CONTROL SYSTEM-RPM LOWER THAN EXPECTEDComponent Location:
GENERAL DESCRIPTION
When engine is idling, the ECM adjusts the throttle valve so that the engine runs at the correct idling speed, regardless of coolant temperature, load and etc. When the additional load applied in the engine, the air flow through the idle speed control actuator is increased momentarily to raise the idling speed.
DTC DESCRIPTION
The ECM monitors engine speed deviation from the target idle engine speed when the vehicle is stopped and the throttle valve opening is stable. The ECM sets DTC P0506 if the difference to the target idle engine speed is lower than the predetermined threshold.
DTC Detecting Condition:
Signal Waveform And Data:
MONITOR DTC STATUS
NOTE: If any MAFS or ETC (TPS, ETC MOTOR or APS) codes are present, do ALL REPAIRS associated with them before proceeding with this troubleshooting tree.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Press F4 (DTAL) to select DTC information from the DTCs menu.
3. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Read "DTC Status" parameter.
5. Is parameter displayed "History (Not Present) fault"?
NOTE:
- History (Not Present) fault : DTC occurred but has been cleared.
- Present fault : DTC is occurring at present time.
YES - Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for loose or poor connections, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure
NO - Go to next step as below
CHECK FOR RESTRICTED INTAKE OR EXHAUST SYSTEM
1. Visually/physically inspect the following items:
- Air cleaner filter element for excessive dirt or for any foreign objects
- Throttle body inlet for damage or for any foreign objects
- Restricted exhaust system
2. Was a problem found in any of the above areas?
YES - Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO - Go to next step as below
COMPONENT INSPECTION
NOTE: It is necessary to perform the TPS adaptation procedure with Scan tool when the throttle body assembly or ECM is replaced.
- TPS adaptation procedure
1. Erase previous TPS adaptation value using Scan tool.
2. Ignition "OFF" and then "ON" without cranking. Wait for 10 seconds under enable conditions
- Enable conditions : Battery 10 V & Intake Air Temp. 5.3 °C(41.5 °F) & 5.3 °C(41.5 °F) Engine Coolant Temp. 99.8 °C(211.6 °F)
3. After TPS adaptation, the system normality should be confirmed by reading out "FMY" on the Scan Tool.
ETC MOTOR INSPECTION
1. Ignition "ON" & Engine "OFF".
2. Install scantool and select "ETC MOTOR" parameter on the Actuation Test mode.
3. Activates "ETC MOTOR" by pressing "STRT (F1)" key.
4. Verify ETC MOTOR is activating (should hear a click from motor).
5. Repeat this procedure 4 or 5 times to ensure ETC MOTOR reliability.
6. Is ETC MOTOR working properly?
YES - Go to next step as below.
NO - Check ETC motor, referring troubleshooting guide for DTC P0638. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure
TPS INSPECTION
1. Start engine and install scan tool
2. Monitor the "TPS VOLTAGE 1 " and "TPS VOLTAGE 2" parameters on the Scantool data list.
Specification : Refer to "Signal Waveform & Data" in the "General Information" procedure
- Output of TPS1 increases smoothly in proportion with the throttle valve opening angle.
- Output of TPS2 decreases smoothly in inverse proportion with the throttle valve opening angle.
3. Are the TPS VOLTAGE 1 & 2 within the specification?
YES - Go to next step as below
NO - Check TPS1 & 2, referring troubleshooting guide for DTC P0121/P0221. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES - Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO - Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Press F4 (DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History (Not Present) fault"?
YES - System performing to specification at this time. Clear the DTC
NO - Go to the applicable troubleshooting procedure.