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Home >> Kia >> 2018 >> Sedona EX >> Repair and Diagnosis >> External Pages >> Different car >> Section 140 (Smart Key Code Saving Diagnosis) >> DTC P1676-00: SMARTRA Message Error >> DTC Inspection >> Monitor KDS/GDS Data >> Check ECM/PCM Communication

Check ECM/PCM Communication

WARNING: This page is about a different car, the 2018 Kia Cadenza. However, it is still accessible from the selected car via links, so may be relevant.
  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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