A4: Check For O2 Sensor Failure
With the conditions held as A3, suddenly decelerate to idle
Has the voltage dropped to 400mV or less?
Yes
Go to A5 A5: Check For O2 Sensor Failure
No
Renew O2 sensor; reconnect plug(s)
Go to A6 A6: Stop
With the conditions held as A3, suddenly decelerate to idle
Has the voltage dropped to 400mV or less?
Yes
Go to A5 A5: Check For O2 Sensor Failure
No
Renew O2 sensor; reconnect plug(s)
Go to A6 A6: Stop