Enable Condition

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Rich → Lean response diagnosis

ENABLE CONDITION

Secondary Parameters	Enable Conditions
Closed loop control with rear oxygen sensor	In operation
Time for fuel cut at deceleration is more than 2 seconds.	Experienced
After fuel cut	≥ 2 seconds

Lean → Rich response diagnosis

ENABLE CONDITION

Secondary Parameters	Enable Conditions
Closed loop control with rear oxygen sensor	In operation
Vehicle speed	≥ 60 km/h (37 MPH)
Front oxygen sensor (A/F) output value x Cumulative amount of intake air for 1.5 seconds	< 800
Cumulative value of front oxygen sensor (A/F) output voltage for 1.5 seconds when front oxygen sensor (A/F) output voltage is less than 0.949.	≤ 18