Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Pump Monitor (FPM) - ERFS
The FPDM communicates diagnostic information to the PCM through the FPM circuit. This information is sent by the FPDM as a duty cycle signal. The 3 duty cycle signals that may be sent are listed in the following table.
| Duty Cycle | Comments | FP_M PIDa |
|---|---|---|
| 50% | This duty cycle indicates that the FPDM is functioning normally. | 80-125% |
| 25% | This duty cycle indicates that the FPDM either did not receive a fuel pump (FP) duty cycle command from the PCM or did not receive a valid FP duty cycle command from the PCM. | 15-60% |
| 75% | This duty cycle indicates that the FPDM detects a concern in the circuits between the fuel pump and FPDM. | 250-400% |
a Some scan tools display the FP_M PID as the duty cycle in column 1. Other scan tools display the FP_M PID as a value shown in the FP_M PID column. This value fluctuates randomly. It is OK for the value to briefly go outside this range, then return.
For additional information, refer to POWERTRAIN CONTROL HARDWARE , Fuel Pump Driver Module (FPDM).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.