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Fuel Pump Monitor (With Fuel Pump Driver Module)

Fuel Pump Driver Module (FPDM) communicates diagnostic information to PCM through Fuel Pump Monitor (FPM) circuit. This information is sent by FPDM as a duty cycle signal. The 3 duty cycle signals that may be sent are listed in FUEL PUMP DRIVER MODULE DUTY CYCLE SIGNALS  table. PCM uses this signal to verify FPDM is powered and able to communicate on the FPM circuit.

FUEL PUMP DRIVER MODULE DUTY CYCLE SIGNALS

Duty Cycle Percent (1) On Time (ms) Comments (2) FP_M PID
25 250 (3) FPDM Did Not Receive Fuel Pump (FP) Duty Cycle Command From PCM, Or Duty Cycle Received Was Invalid 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) If a duty cycle meter and breakout box is used, be aware that these values may be reversed depending on trigger setting of specific meter (for example, 25 percent from FPDM may read as 75 percent on duty cycle meter depending on trigger setting).
(2) Some scan tools may not have capability to access FP_M PID. Percentage will fluctuate randomly. It is okay for value to briefly go outside this range, then return.
(3) Refer to FUEL PUMP  under OUTPUT SIGNALS.
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