Component Inspection

Check APS
1. Ignition "OFF"
2. Disconnect APS connector.
3. Measure APS 1 and APS 2 signal waveform when stepping on accelerator pedal.
  Specification: Approx. 0.3 ~ 1.0V (when not stepping on the accelerator pedal)
  
  Approx. 4.0 ~ 5.5V (when stepping on the accelerator pedal fully)
  
  Fig 1: APS 2 Signal Waveform
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the signal waveform within specifications?
  YES
  - 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 the PCM needs to be replaced, do "ETS Initialization" after it is replaced.
  NO
  - Check APS for contamination, deterioration, or damage. Substitute with a known-good APS and check for proper operation.If the problem is corrected, replace APS and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    NOTE:
    Procedure of ETS Initialization
    
    Erase the trouble codes on PCM
    
    Turn the ignition key on less than 1 second and turn it off(Do not start the engine)
    
    Turn the ignition key off and keep this condition until the main relay is turned off. (It will takes 10 seconds)
    
    Turn ignition key on more than 1 second to record the throttle motor position on the EEPROM