Enable Condition

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