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Home >> Oldsmobile >> 1997 >> Eighty-Eight LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1643 - Fuel Pump Pulse Width Modulation PWM) Control Circuit >> Diagnostic Aids
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Diagnostic Aids

Check for faulty connections or damaged harness. Disconnect PCM connector. Turn ignition on. Connect a DVOM between engine ground and PCM harness connector fuel pump PWM driver circuit. Observe DVOM while moving all related harness and connectors. A change in voltage display indicates fault location.