2.
Are there the DTCs above-mentioned?
▶ Do all repairs associated with those codes before proceeding with this procedure.
▶ Go to "System Inspection" procedure
The idle speed is controlled by the Electrical Throttle Control(ETC) System. ETC system is composed of the throttle motor to operate the throttle valve and the throttle position sensor to detect the opening angle of the throttle valve, the accelerator pedal position sensor to detect the accelerator pedal position and the one valve type throttle body. The ECM controls the throttle motor to provide the proper throttle valve opening angle for the target idle speed.
Checking idle RPM under detecting condition, if if the real idle speed is lower than desired idle speed by 100 RPM over 10 sec., PCM sets P0506. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
Item | Detecting Condition | Possible cause | |
DTC Strategy | ● Monitor idle speed | ● Intake system for blockage | |
Enable Conditions | ● Normal idle conditions | ||
Thresh old value | ● Real engine speed is lower than target engine speed by 100 RPM | ||
Diagnosis Time | ● Continuous | ||
MIL On Condition | ● 2 driving cycles | ||
Monitor DTCs related to HO2S, MAFS, MAPS, ECTS, PCSV, Injector, CVVT items, ETC system, A/C system, or power steering system with scantool.
Are there the DTCs above-mentioned?
▶ Do all repairs associated with those codes before proceeding with this procedure.
▶ Go to "System Inspection" procedure
Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure
▶ Go to " System Inspection " procedure
Check intake system for blockage
Visually/physically inspect the following items:
Air cleaner filter element for excessive dirt or for any foreign objects
Hoses of intake system for blockage
Throttle body inlet for damage or for any foreign objects
Throttle plate for carbon deposits
Has a problem been found in any of the above areas?
▶ Repair it and go to "Verification of Vehicle Repair" procedure
▶ Clear DTC and Test-drive under enable conditions above-mentioned. After the test, If this DTC is set, go to "Inspection & Repair" procedure. If not, troubleshooting is completed.
Check ETS motor
Ignition "OFF"
Disconnect ETS motor connector
Measure resistance between terminals "1" and "2" of the ETS motor connector.
Specification: Approx. 1.275 ~ 1.725Ω at 20℃(68 °F)
Is the measured resistance within specifications?
▶ Go to "Check TPS" as below
▶ Substitute with a known-good ETS motor and check for proper operation. If the problem is corrected, replace ETS motor and then do "ETS Initialization" and go to "Verification of Vehicle Repair" procedure.
Check TPS
Disconnect TPS connector and measure resistance between terminals 4 and 8 of the TPS connector.
Specification : Approx. 4.0~6.0kΩ( with throttle valve fully closed) at 20°C(68°F)
Disconnect TPS connector and measure resistance between terminals 1 and 5 of the TPS connector.
Item | Sensor Resistance at 20℃ (68°F) |
TPS 1 | 4.0 ~ 6.0 ㏀ |
TPS 2 | 2.72 ~ 4.08 ㏀ |
Are the TPS resistance within specifications?
▶ Substitute with a known-good PCM and check for proper operation. If the problem is corrected,replace PCM and then go to "Verification of Vehicle Repair" procedure. If PCM needs to be replaced, do "ETS Initialization" after it is replaced.
▶ Substitute with a known-good TPS and check for proper operation.If the problem is corrected, replace TPS and then do "ETS Initialization". And go to "Verification of Vehicle Repair" procedure.
※ Procedure of ETS Initialization
1. Erase the trouble codes on PCM
2. Turn the ignition key off and keep this condition until the main relay is turned off.(It will takes 10 second)
3. Turn ignition key on more than 1second to record the throttle motor position on the EEPROM
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode
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
Read "DTC Status" parameter
Is parameter displayed "History(Not Present) fault"?
▶ System performing to specification at this time. Clear the DTC.
▶ Go to the applicable troubleshooting procedure.
