XB166 - Check HFP Circuit For Short to Power

- Key "OFF".

- High Speed Fuel Pump (HFP) relay disconnected.

- Disconnect Variable Control Relay Module (VCRM).

- Key "ON".

- Measure voltage between the HFP circuit at the HFP relay vehicle harness connector and the battery negative post.

- Key "OFF".

- Was voltage less than 1.0 volt?

Yes -- Go to XB167. XB167 - Check HFP Circuit For Short to Ground

No -- Service High Speed Fuel Pump (HFP) circuit short to power. Reconnect all components. Re-evaluate symptom.