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Check ECM/PCM Communication

  1. Ignition "ON" & Engine "OFF".
  2. Connect KDS/KDS/GDS and setup the oscilloscope.
  3. Back probe and measure signal waveform of Pin No. 6 (EMS COM) terminal of SMK main harness connector and chassis ground by using VMI A channel.

    Specification:  Refer to Fig 1 below

    Fig 1: Screen Display - Communication Signal Waveform Between SMK Unit & ECM/PCM
    G12280761Courtesy of KIA MOTORS AMERICA, INC.
  4. Is the measured signal waveform normal?

    YES 

    • Fault is intermittent caused by poor contact in Smart Key unit and/or ECM/PCM's connector or was repaired and Smart Key unit and memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF REPAIR " procedure.

    NO 

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