DTC Information: DTC Detecting Condition

Item		Detecting Condition	Possible Cause
Case 1	DTC Strategy	Feedback: fails to enter or defaults-out by Load Pulse.	Poor connection Open in signal circuit 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 10~772 kJ (kilojoules).
	Threshold Value	Average of loaded voltage greater than 2.8 V.
	Diagnostic Time	3 Seconds.
Case 2	DTC Strategy	Open circuit, or internal resistance too high.
	Enable Conditions	Battery voltage greater than 10.7V. Exhaust Gas Temperature (EGT) around downstream HO2S greater than 600°C (1112°F) or heat quantity from exhaust gas around downstream HO2S greater than 10~772 kJ (kilojoules).
	Threshold Value	Internal resistance greater than 40 kΩ.
	Diagnostic Time	3 Seconds.
Case 3	DTC Strategy	HO2S signal interruption by heater.
	Enable Conditions	Battery voltage greater than 10.7V. Time after heat quantity from exhaust gas greater than 10~772kJ (kilojoules) over 10 seconds.
	Threshold Value	Downstream HO2S voltage counter variation greater than 2V for 0.04sec after heater on -> off.
	Diagnostic Time	2 Seconds.
MIL ON Condition		2 driving cycles.

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