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Home >> Kia >> 2020 >> Optima EX Premium >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Dual Clutch Transmission Diagnosis - 1.6L (2 Of 2) (Except HEV) >> DTC U0121-87: Lost Communication With Anti-Lock Brake System (ABS) Control Module >> Wiring Inspection >> CAN Communication Line Inspection >> Resistance measurement with matching resistor

Resistance measurement with matching resistor

  1. Ignition "OFF" and disconnect the battery and wait about four minutes.
  2. Make sure all modules are properly connected.
  3. Measure resistance between Pin No. 3 (C-CAN High) and Pin No. 11 (C-CAN Low) terminal of Data Link Connector (DLC).

    Specification:  Approx. 60Ω

  4. Is measured value within specification?

    YES 

    • Check each module connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    * If the measured value is approx. 0Ω, then check for short CAN communication line.

    * If the measured value is approx. 120Ω, then check for open CAN communication line of control module with resistor.

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