F7: Check For O2 Sensor Failure

With the conditions held as in F6, run the engine at 1500 rpm for approximately 2 minutes.

- Does the displayed voltage drop below 400mV and rise above 500 mV, cycling approximately every 4 seconds?
Yes
GO to F9 F9: Heated O2 Sensor Short Circuit to Ground
No
Renew O2 sensor. Reconnect plug(s).
GO to F8 F8: Stop