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DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
Case 1 DTC Strategy
  • Feedback: fails to enter or defaults-out by Load Pulse.
  1. Poor connection
  2. Open in signal circuit
  3. HO2S downstream (S2)
Enable Conditions
  • Duration of downstream HO2S between 0.4 - 0.5V for more than 3 seconds.
  • Load pulse: End of 3rd pulse.
  • Battery voltage greater than 10.7V.
  • Heat quantity from exhaust gas around downstream HO2S greater than 1~312 kJ.
Threshold Value
  • Average of loaded voltage greater than 2.8 V.
Case 2 DTC Strategy
  • Open circuit, Internal resistance too high.
Enable Conditions
  • B+ greater than 10.7 V.
  • EGT around downstream O2S greater than 600 °C(1112 °F) or Heat quantity from exhaust gas around downstream O2S greater than 1~312 kJ (Kilojoules).
Threshold Value
  • Internal resistance greater than 40 kΩ.
Diagnostic Time
  • 3 seconds.
MIL ON Condition
  • 2 driving cycles.

* S2: upstream oxygen sensor/S2: downstream oxygen sensor

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