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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 >> Circuit Description
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Circuit Description

Output Driver Modules (ODM) are used by PCM to turn on current-driven devices needed to control various engine and transaxle functions. Each ODM can control up to 7 outputs, including fuel pump Pulse Width Modulation (PWM) driver circuit, by supplying ground to device PCM is commanding on. ODMs can diagnose each circuit individually. If ODM "A" output 3 (fuel pump PWM driver circuit) detects an improper voltage level, P1643 is set.

Conditions required to set DTC are:

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