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Fuel Pump Relay: Description and Operation

FUEL PUMP CONTROL

The ECM activates the main relay (2/32) when the ignition is switched ON. The fuel pump relay (2/23) is activated simultaneously for one second to
enable the pump (6/31) to develop pressure.

As the engine is turned by the starter motor, the RPM sensor (7/25) and CMP sensor (7/21) deliver engine speed and crankshaft position signals to the
ECM, which activates the fuel pump relay. The fuel pump functions continuously when the engine operates.

Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Diagrams > Page 356

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