Enable Condition

Rich → lean response diagnosis

ENABLE CONDITION

Secondary Parameters	Enable Condition
Battery voltage	> 10.9 V
A/F sub feedback control condition	Completed
Deceleration fuel cut time is 6 seconds or more.	Experienced
After fuel cut	≥ 2 sec.
Rear oxygen heater current calculation time	≥ 60 sec.
Rear oxygen heater current continuous time	≥ 30 sec.
Catalyst warm-up counter (U5 model)	≥ 9000 times
Estimated temperature in catalyst layer (Except for U5 model)	≥ 400°C (752°F)

Lean → rich response diagnosis

ENABLE CONDITION

Secondary Parameters	Enable Conditions
Battery voltage	> 10.9 V
A/F main feedback control condition	Completed
Deceleration fuel cut ≥ 6 seconds	Experienced
After fuel cut	≥ 2 sec.