General Information: DTC Detecting Condition

DTC DETECTING CONDITION AND POSSIBLE CAUSES

Item		Detecting Condition	Possible Cause
DTC Strategy	Case 1	Signal plausibility with rich mixture (during catalyst purge after fuel cut-off)	Poor connection or damaged harness HO2S contamination
DTC Strategy	Case 2	Signal plausibility with lean mixture (during fuel cut-off)
Enable Conditions	Case 1	Coolant temperature >73°C (163°F) Downstream O2 sensor operative readiness detected Downstream O2 sensor pre-heating phase finished 4g < Integrated Mass Air Flow in last Fuel Cut-Off Downstream O2 sensor signal at end of last fuel cut off <0.3V Integrated air mass flow in Part Load >150g Minimum upstream O2 sensor voltage during Catalyst Purge phase >0.6V Modeled catalyst temperature >400°C (752°F) No relevant failure 11V < Battery voltage <16V
Enable Conditions	Case 2	Downstream O2 sensor operative readiness detected Downstream O2 sensor pre-heating phase finished 12g < Integrated mass air flow since fuel cut-off begin <250g No relevant failure 10V < Battery voltage <16V
Threshold Value	Case 1	Max. downstream HO2S <0.6V during catalyst purge after fuel cut-off
Threshold Value	Case 2	Downstream HO2S >0.3V during fuel cut-off phase
Diagnostic Time	Case 1	3 valid fuel cut-off followed by catalyst enrichment phases
Diagnostic Time	Case 2	5 sec.
MIL On Condition		2 Drive Cycles