HB16 - Check Power at HO2S Harness Connector

- Key "ON", engine "OFF".

- Heated Oxygen Sensor (HO2S) disconnected.

- Measure voltage between KEY POWER circuit and PWR GND circuit at the HO2S vehicle harness connector.

- Is voltage greater than 10.5 volts?

Yes -- Reconnect HO2S. HO2S system OK. Fuel delivery is OK. HO2S may have cooled prior to Key On Engine Running (KOER) Self-Test. If symptom persists, problem is in an area common to all cylinders, i.e. air/vacuum leak, fuel contamination, Exhaust Gas Recirculation (EGR). Service as necessary.

No -- Go to HB17. HB17 - Check Continuity of Power Ground Circuit