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Home >> Isuzu >> 1999 >> Hombre S Regular Cab 2WD L4-2.2L CPC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Description and Operation >> Fuel Metering System >> Fuel Metering System Components >> Fuel Pump Electrical Circuit
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Fuel Pump Electrical Circuit

Fuel Pump Electrical Circuit
When the ignition switch is turned to the ON position, the PCM energizes the fuel pump relay for 2 seconds allowing the fuel pump to pressurize the fuel system. If the PCM does not receive any ignition reference pulses (engine cranking or running) within 2 seconds, the PCM de-energizes the fuel pump relay; this causes the fuel pump to stop.

An inoperative fuel pump relay can result in long cranking times.
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