General Information: DTC Detecting Condition

DTC DETECTING CONDITION CHART

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	Downstream O2 sensor operative readiness detected Downstream O2 sensor pre-heating phase finished Integrated Mass Air Flow in last Fuel Cut-Off > 0g Downstream O2 sensor signal at end of last fuel cut off < 0.25V Integrated air mass flow in Part Load > 150g Minimum upstream O2 sensor voltage during Catalyst Purge phase > 0.95V 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 16g < Integrated mass air flow since fuel cut-off begin < 250g Downstream O2 sensor signal at fuel-cut-off entry > 0.6V No relevant failure 10V< Battery voltage <16V
Threshold Value	Case 1	Max. VLS_DOWN < 0.6 V
Threshold Value	Case 2	VLS_DOWN > 0.20 V
Diagnostic Time	Case 1	3 valid fuel cut-off followed by catalyst enrichment phases
Diagnostic Time	Case 2	5 sec.
MIL On Condition		2 Driving Cycles