H3: Check For O2 Sensor Failure

Ignition switch to position 0
Disconnect EM024

Bracket on top of gearbox or Bulkhead rear of engine

Run the engine for a period to warm the sensor and then maintain a steady speed of approximately 2500 rpm.

With EM024 disconnected, measure the voltage between EM024/001 and EM024/002.

- Is the voltage between 600mV and 1.0 Volt?
Yes
GO to H4 H4: Check For O2 Sensor Failure
No
Renew O2 sensor. Reconnect plug(s).
GO to H7 H7: Stop