J4 - Check Fuel Pump Circuit For Short to Ground

- Key "OFF".

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

- Fuel pump relay disconnected.

- Measure resistance between test pin 22 and test pins 40 and 60 at the breakout box.

- Is resistance greater than 10,000 ohms?

Yes -- Go to J5. J5 - Check Fuel Pump Circuit Continuity

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