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HOMESERVICE MANUALSSATURN2000LS1 L4-2.2L VIN FREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDESCRIPTION AND OPERATIONPOWERTRAIN CONTROL MODULEFUEL PUMP CONTROL
2000 Saturn LS1 L4-2.2L VIN F

Fuel Pump Control

2000 Saturn LS1 L4-2.2L VIN FSECTION Fuel Pump Control
The PCM controls in-tank electric fuel pump by energizing or de-energizing fuel pump relay. When ignition key is first turned to RUN position, PCM will energize fuel pump relay, by supplying power, for approximately two seconds to pressurize fuel system. If vehicle is started and received from EI module, fuel pump relay will be left energized. If engine is not started within approximately 2 seconds, relay will be de-energized. When ignition key is turned to Off position fuel pump relay will be de-energized. The fuel pump relay will also be de-energized within approximately two seconds, if crankshaft pulses are not received. This is a safety feature, in case of an accident fuel to engine compartment is shut-off.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.