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DTC P0891 At Relay - Open Circuit: DTC Detecting Condition

DTC DETECTING CONDITION CHART

Item Detecting Condition Possible cause
DTC Strategy 
  • Check voltage range
  • Open or short in circuit
  • Faulty A/T control relay
  • Faulty PCM/TCM
Enable Conditions 
  • 16V > Voltage Battery > 11V
  • A/T Relay = ON
Threshold value 
  • Feedback Voltage ≥ 20V
Diagnostic Time 
  • 1 second
Fall Safe 
  • Locked in 3 rd gear. (control relay off)
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