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U210C MERCURY

U210C MERCURY - Lost Communication Between Fuel Pump Control Module 'B' and Restraints Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

Possible causes

  • Event Notification Signal (ENS) harness is open or shorted
  • Event Notification Signal (ENS) circuit poor electrical connection
  • Radio frequency interference or electromagnetic interference
  • Faulty Restraints Control Module (RCM) 2
  • Faulty Fuel Pump Control Module
  • Tech notes

    Check the harness for routing, alterations, incorrect shielding, or electrical interference from other systems. The Event Notification Signal (ENS) is used to notify the fuel pump control module 2 of an event requiring the fuel pump to be disabled. This signal is used instead of an Inertia Fuel Shutoff (IFS) switch. The fuel pump control module 2 monitors the ENS signal by sending a 12V low current signal on the ENS circuit to the Restraints Control Module (RCM).

    Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • U210c Mercury Description

    The Fuel Pump Control Module 2 monitors the duty cycle and frequency of the signal it receives from the Restraints Control Module (RCM). The fuel pump control module 2 determines if the signal on the Event Notification Signal (ENS) circuit from the RCM is a valid duty cycle and frequency. If the duty cycle or frequency is invalid, the fuel pump control module 2 sends a 40% duty cycle signal on the Fuel Pump Monitor 2 (FPM2) circuit to report the concern to the Powertrain Control Module (PCM). The test fails when the fuel pump control module 2 is still reporting that it is receiving an invalid duty cycle or frequency from the RCM after a calibrated amount of time.
    OBDII Code U210c Mercury - Lost Communication Between Fuel Pump Control Module 'B' and Restraints Control Module - Engine-Codes.com

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