C5: Check For O2 Sensor Failure

With the conditions held as in C4, run the engine at 1500 rpm for approximately 3 minutes.

- Does the displayed voltage drop below 400mV and rise above 500 mV, cycling approximately every 180 seconds?
Yes
GO to C7 C7: Check For O2 Sensor Continuity
No
Renew O2 sensor and reconnect plug(s).
GO to C6 C6: Stop