DTC Information: DTC Detecting Condition

Item		Detecting Condition	Possible Cause
Case 1	DTC Strategy	Feedback: fails to enter, defaults out by Load pulse.	Poor connection Open in signal circuit HO2S (S2)
	Enable Conditions	Duration of Down O2S greater than 0.4 and less than 0.5V for more than 3 sec. Load pulse: End of 3rd pulse. B+ greater than 10.7 V. Heat quantity from exhaust gas around downstream O2S greater than 10~772 kJ.
	Threshold Value	Average of loaded voltage greater than 2.8 V.
	Diagnostic Time	3 sec.
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 10~772 kJ.
	Threshold Value	Internal resistance greater than 40 kΩ.
	Diagnostic Time	3 sec.
Case 3	DTC Strategy	O2S signal interrupt by heater.
	Enable Conditions	B+ greater than 10.7 V. Time after heat quantity from exhaust gas greater than 10~772kJ over 10sec.
	Threshold Value	Counter of variation of downstream O2S Voltage greater than 2V for 0.04sec after heater on -> off.
	Diagnostic Time	2 sec.
MIL ON Condition		2 driving cycles.
* S2: upstream oxygen sensor/S2: downstream oxygen sensor