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Home >> Kia >> 2019 >> Optima EX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 210 (Smart Key Unit Diagnosis (PHEV)) >> DTC B1602-00: CAN Error >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

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Item Detecting Condition Possible cause
DTC Strategy
  • CAN communication monitoring
 Under wake condition
  1. Open or short in CAN high line
  2. Open or short in CAN low line
  3. Shorted circuit between CAN high and low line
    CAUTION: CAN high has ground voltage and CAN low has battery voltage during sleep condition.
Enable Conditions
  • Ignition "ON" and power is supplied to SMK unit
    1. Short to battery in CAN high line
    2. Short to battery in CAN low line
    3. Short to ground in CAN high line
    4. Short to ground in CAN low line
    5. Shorted circuit between CAN high and low line
    6. Short to 5V power in CAN high line
    7. Open in CAN high line
    8. Open In CAN low line
Threshold value
  • CAN high:

    CAN high line is shorted to ground if voltage in CAN high line is 0V.

    CAN high line is shorted to power if voltage in CAN high line is B+

  • CAN low:

    CAN low line is shorted to ground if voltage in CAN high line is 0V.

    CAN low line is shorted to power if voltage in CAN high line is B+
Diagnostic Time
  • Fault continues for 2s under normal battery voltage (9 to 16V)
DTC Erasing Time
  • Immediately if fault is cleared under normal battery voltage. (Active DTC)
  • 30 Ignition cycles (Ignition switch ON to OFF (History DTC)
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