Ford EEC Fuel Pump Relay Operation - Control Module & PIP Signal Logic

This scanned manual page excerpt explains how the EEC control module controls fuel pump operation. The control module runs the fuel pump(s) for one second when it receives an IGNITION-ON signal, and continues to run them as long as it receives a CRANK signal from the ignition switch. When the module receives a PIP (Profile Ignition Pickup) signal from the Hall-effect devices, it maintains pump operation even after the key is released from the START position. If the PIP signal falls below 120 rpm, the control module cuts off its signal to the Fuel Pump Relay or the Integrated Relay Control Module, shutting down the pump. The pump can also be forced to run by jumping the terminals of the fuel-pump test connector. Two summary bullet points reinforce the logic: the module signals the pump when it receives a CRANK signal and when PIP signals indicate the engine is running; and the pump does not run if PIP indicates the engine is not running, even with the ignition ON, except during the initial one-second prime. This page is useful for diagnosing no-start or fuel delivery problems related to the fuel pump relay circuit on EEC-equipped Ford vehicles.