General Information: DTC Detecting Condition

DTC DETECTING CONDITION AND POSSIBLE CAUSE

Item		Detecting Condition	Possible Cause
DTC Strategy	Case 1)	Signal Plausibility with Rich mixture (during Catalyst Purge after Fuel Cut-off)	Related fuse blown or missing Poor connection or damaged harness HO2S contamination
	Case 2)	Signal Plausibility with Lean mixture (during Fuel Cut-Off)
	Case 3)	Signal Plausibility during Full Load
Enable Conditions	Case 1)	HO2S sensor operative readiness detected Integrated mass air flow in last fuel cut off > 4g Integrated mass air flow in part load > 250g Downstream HO2S sensor signal at end of last fuel cut off < 0.25V Sensor preheating and full heating phases finished Minimum HO2S (S1) during Catalyst Purge phase < 0.98 Catalyst temperature > 348°C (658°F) No relevant failure 11V < Battery voltage < 16V
	Case 2)	HO2S sensor operative readiness detected 20g < Integrated mass air flow in last fuel cut off < 200g Sensor preheating and full heating phases finished No relevant failure 10V < Battery voltage < 16V Fuel Cut Off active
	Case 3)	HO2S sensor operative readiness detected HO2S sensor pre-heating phase finished 70g < Integrated Mass Air Flow since begin Full Load < 300g 10V<Battery voltage<16V
Threshold Value	Case 1)	Voltage <0.55V
	Case 2)	Voltage with fuel cut > 0.1V
	Case 3)	Voltage with Full load < 0.70V
Diagnostic Time	Case 1)	3 valid fuel cut-off phases
	Case 2)	2 sec.
	Case 3)	2 sec.
Mil On Condition		2 Driving Cycles