XB126 - Check FPM Circuit Continuity

- Key "OFF".

- Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.

- Install breakout box, leave PCM disconnected.

- Disconnect High Speed Fuel Pump (HFP) relay.

High Fuel Pump Relay Connector:

- Measure resistance between test pin 8 at the breakout box and the power-to-pump circuit at the HFP relay vehicle harness connector.

- Is resistance less than 5.0 ohms?

Yes -- Go to XB127. XB127 - Check Left HO2S For Short to Power

No -- Service open in Fuel Pump Monitor (FPM) circuit between PCM and splice to power-to-pump circuit. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)