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Home >> Chevrolet >> 2002 >> Chevy Express G3500, Van Cargo Extended, 4.3 W >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel System (Gasoline) >> Fuel Injector Circuit Diagnosis (4.2L) >> Circuit Description
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Circuit Description

Powertrain Control Module (PCM) enables appropriate fuel injector on intake stroke for each cylinder. A voltage is supplied directly to fuel injectors. PCM controls each fuel injector by grounding Control circuit via a solid state device called a driver.

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