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Fuel Pump Monitor (Models With Fuel Pump Driver Module)

The Fuel Pump Driver Module (FPDM) communicates diagnostic information to the Powertrain Control Module (PCM) through the Fuel Pump Monitor (FPM) circuit. This information is sent to the PCM as a duty cycle signal. Three duty cycle signals may be sent. See FUEL PUMP DRIVER MODULE DUTY CYCLES  table. PCM uses this signal to verify FPDM is powered and able to communicate on the FPM circuit.

FUEL PUMP DRIVER MODULE DUTY CYCLES

Duty Cycle Percent On Time (mS) Comments (1) Scan Tool PID (Percent)
25 250 FPDM Did Not Receive Fuel Pump (FP) Duty Cycle Command From PCM, Or Duty Cycle Received Was Invalid (2) 15-60
50 500 "All Ok" Output From FPDM. With This Input, PCM Can Verify FPDM Is Powered And Able To Communicate On FPM Circuit 80-125
75 750 FPDM Has Detected Fault In Circuits Between Fuel Pump And FPDM 250-400
(1) Value will fluctuate randomly. It is ok for value to briefly go outside this range, then return.
(2) Refer to FUEL PUMP  under OUTPUT SIGNALS.
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