X73 - Check Fuel Pump Circuit For Short to Power

- Key "OFF".

- Breakout box installed, Powertrain Control Module (PCM) disconnected.

- Constant Control Relay Module (CCRM) disconnected.

- Key "ON".

- Measure voltage between test pin 22 and the battery negative post.

- Is voltage less than 1.0 volt?

Yes -- Go to X74. X74 - Check Fuel Pump Circuit For Short to Ground

No -- Service short to power. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

If Diagnostic Trouble Code (DTC) 556/557 is still present, replace PCM.