A5: Check For O2 Sensor Failure

With the conditions held as A4, suddenly accelerate to approximately 2500 rpm.

- Has the voltage risen to between 600mV and 1 volt?
Yes
GO to A7 A7: Heated O2 Sensor Short Circuit to Ground
No
Renew O2 sensor; reconnect plug(s)
GO to A6 A6: Stop