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Fuel Pump Duty Cycle Output From PCM

FP Duty Cycle Command PCM Status Fuel Pump Control Module Actions
0-15% Invalid OFF duty cycle. The fuel pump control module sends a 20% duty cycle signal on the fuel pump monitor (FPM) circuit. The fuel pump is OFF.
5-51% Normal operation. The fuel pump control module operates the fuel pump at the speed requested. FP duty cycle times 2 equals pump speed % of full ON. For example, FP duty cycle equals 42%. 42 times 2 equals 84. Pump is run at 84% of full ON. The fuel pump control module sends a 60% duty cycle signal on FPM circuit.
51-67% Invalid ON duty cycle. The fuel pump control module sends a 20% duty cycle signal on the FPM circuit. The fuel pump is OFF.
67-83% Valid OFF duty cycle. The fuel pump control module sends a 60% duty cycle signal on FPM circuit. The fuel pump is OFF.
83-100% Invalid ON duty cycle. The fuel pump control module sends a 20% duty cycle signal on the FPM circuit. The fuel pump is OFF.

For additional information, refer to POWERTRAIN CONTROL HARDWARE , Fuel Pump Control Module.

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