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Home >> Kia >> 2017 >> Forte EX >> Repair and Diagnosis >> External Pages >> Different car >> Section 264 (Smart Key Unit Diagnosis) >> DTC B1603-00: Can Bus Off >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

WARNING: This page is about a different car, the 2017 Kia Niro. However, it is still accessible from the selected car via links, so may be relevant.
Item Detecting Condition Possible cause
DTC Strategy
  • Monitoring CAN communication
Under wake condition
  • Short to power/ground in CAN high and low line
  • Faulty SMK Unit
Enable Condition
  • Ignition "ON" and power is supplied to SMK Unit
    1. Short to ground in CAN High and Low line
    2. Short to power in CAN High and Low line
Threshold Value
  • CAN high/Low: Circuit is shorted to ground if measured voltage is 0V and shorted to power if measured voltage is B+
Diagnostic Condition
  • Fault continues for 2s at normal battery voltage (9V to 16V)
DTC Erasing Time
  • DTC immediately erased after the solving the fault at the normal voltage (Active DTC)
  • 30 Ignition cycles (History DTC)