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Home >> Chevrolet >> 2003 >> S10 Pickup 2D Pickup, 2.2 H, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Engine Component Tests - 2.2L >> Fuel Systems >> Fuel Pump Electrical Circuit Test >> Circuit Description

Circuit Description

The PCM enables the fuel pump relay when the ignition switch is turned on. The PCM will disable the fuel pump relay within 2 seconds unless the control module detects ignition reference pulses. PCM continues to enable fuel pump relay as long as ignition reference pulses are detected. PCM disables the fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and ignition remains on.

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