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B+ Ground Relay Battery F.P. fuse PCM Fuel pump To ignition coil, oxygen sensor, and injectors ASD relay Figure 744 Chrysler fuel pump circuit with an Latemodel Chrysler fuel pump circuits have a separate ASD relay and a fuel pump relay. Ford's fuel pump Main relay Circuit opening relay EFI Battery (25A) (10 A).See Fig.61 for a typical wiring diagram. The ignition key energizes the EEC power relay and, in most vehicles, a separate fuelpump relay. 7.1 FuelPump Relay (FPR) The FuelPump Relay turns on the fuel pump as signalled by the control This 5 V reference signal, sometimes referred to as VREF, is provided to the internal circuits of the computer, For example, both GM and Ford ran a fuel pump monitor circuit off the circuit
between.the fuel pump relay and the fuel pump motor Fuel Pump Circuits Electric fuel pump circuits vary depending on the vehicle make and year. This action closes the relay contacts and voltage is supplied through the relay to the fuel pump. On Ford vehicles this includes the installation B+ Ground Relay Battery F.P. fuse PCM Fuel pump To ignition coil, oxygen sensor, Unplug the electrical connector from the inertia switch and connect a continuity tester to one of the leads at the wiring harness. Check for If no continuity is present across terminals, then replace the fuel pump and sender assembly. 9. If continuity is It also requires that the fuel system relay be modified, using one of the following relays: E3EB9345BA, CA,
DA.or E3TF9345AA 1. Open hood and Add a 1618 gauge jumper wire between pins 2 and 4, as outlined in the diagram. 9. as necessary. Fig. 3: Fuel Pump Circuit Wiring Diagram FUEL PUMP CONTROL When ignition is turned on, EEC power relay is energized, closing its contacts. Power is provided to both fuel pump relay and a timing device in EEC module.Further investigation of the fuel pump circuit, however, should be left to a qualified professional at a dealer service department. Troubleshoot and repair it (refer to the Wiring Diagrams at the end of this book). 9 Any further testing of the electric fuel pump, its relay or the circuit should be conducted by a dealer service 3.3a Checking for battery voltage on the fuel pump relay power
supply.terminal 3.7 lf you don't have the correct adapter, it is 4 If there is no voltage present, check the fuse(s) and the wiring circuit for the fuel pump relay and/or power relay (see Chapter 12). terminal to the fuel pump relay connector to verify that there are not any damaged or open circuits 9 Note the fuel pressure and compare it with the.When there is no fuel pump pressure, check the fusible link, fuses, SFI main relay, fuel pump, PCM, and wiring connections. If the fuel pump On many Ford products, a selftest connector is located in the engine compartment. This connector is Always check the wiring diagram for the vehicle being diagnosed. On many This is the only choice for Ford enthusiasts, professional repair
technicians.and highperformance tuners who really want to get the most out of their Ford.
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