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Home >> Hyundai >> 2021 >> Accent SEL >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Collision/Avoidance >> Autonomous Emergency Braking System Diagnosis >> DTC C1646-81: CAN Message Failure - TCU (Invalid) >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

Trouble Shooting Condition Possible Cause
Main Action
  • Monitoring CAN messages
  1. Faulty Gear position system (Inhibitor switch
  2. Faulty TCM system
Prerequisite Condition
  • Engine is on (Confirm that an engine operation signal is sent from EMS for over 2 seconds)
  • Battery Voltage is between 9V and 16V
  • Ignition has been on for over 2 seconds
  • CAN communication lines are normal
  • No CAN Bus off
Threshold Value
  • When AEB (SCC) Module received abnormal gear position message (Invalid) from TCM via CAN.
Diagnosis Time
  • 500 milliseconds
MIL
  • SCC/AEB Disengagement/Shutdown
  • SCC/AEB Warning lamp turns 'ON'