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Home >> Kia >> 2016 >> Optima SX Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 91 (Engine Control System Diagnosis - 1.6L (3 Of 3) - Optima (Except HEV)) >> DTC U0101: Lost Communication With TCM >> Component Inspection

Component Inspection

WARNING: This page is about a different variant/trim than selected.

■ Inspection CAN Waveform 

  1. Ignition "OFF" and connect each channel scope to CAN-H Ignition H terminal and CAN-LOW terminal.
  2. Ignition "ON" after disconnecting only ECM to CAN BUS.
  3. Ignition "ON" after disconnecting only Instrument Cluster to CAN BUS.

    Specification:  At Ignition "ON", the waveform is same as the one of "Signal Waveform & Data"

    Fig 1: Screen Display - Normal Waveform With Ignition ON
    G11832723Courtesy of KIA MOTORS AMERICA, INC.

    Monitoring CAN HIGH and LOW simultaneously is important in monitoring CAN communication waveform. When CAN HIGH signal rise to 3.5V and LOW signal drops to 1.5V - voltage difference between HIGH and LOW signal is 2V.

■ Inspection CAN Resistance 

  1. Ignition "OFF"
  2. Measure resistance between Pin No. 3 (CAN-High) and Pin No. 11 (CAN-Low) terminals of data link connector (Measurement "A")
  3. Disconnect ECM, Instrument Cluster, and BCM connector.
  4. Measure resistance between Pin No. 3 (CAN-High) and Pin No. 11 (CAN-Low) terminals of data link connector (Measurement "B")

    Specification: 

    ECM, Instrument Cluster and BCM connected: Approx. 60Ω (Measurement "A")

    ECM disconnected: Approx. 120Ω (Measurement "B")

■ Confirm CAN Inspection 

  1. CAN waveform and resistance normal?

    YES 

    NO 

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