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GMC Truck
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1993
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S15/T15 2WD P/U L4-151 2.5L
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Fuel Pump Signal
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Description and Operation
Fuel Pump Signal: Description and Operation
PURPOSE
The
fuel pump
voltage signal
is used by the ECM as a reference to determine fuel system electrical loading and circuit integrity.