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1996
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LSS 3.8 1
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Engine Control Systems Tests W/Codes
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Diagnostic Trouble Codes
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DTC P1643 - Fuel Pump Pulse Width Modulation (PWM) Control Circuit
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Conditions required to set DTC are:
Conditions required to set DTC are:
Ignition is on.
An improper voltage level has been detected on fuel pump PWM driver circuit.
Listed conditions are present for more than 30 seconds.