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DTC U0121 Abs-ITM Can Comm. Line: DTC Detecting Condition

DTC DETECTING CONDITION CHART

Item Detecting Condition Possible Cause
DTC Strategy
  • ABS-ITM Communication Line, or ECU side malfunction
  • CAN HIGH/LOW circuit open/short
  • Faulty ABS/ESC
  • Faulty TCCU
Enable Conditions
  • Message present 1.0 sec self clearing
Threshold Value
  • Loss of the 4D0H message for greater than 1 second
Diagnostic Time
  • 1 sec
MIL on condition
  • 0.5 Sec
Fail Safe
  • Fault code stored in memory, and ABS/ESC strategy deactivated
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