U210C MERCURY - Lost Communication Between Fuel Pump Control Module 'B' and Restraints Control Module
U210c Mercury 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
U210c Mercury 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).
Cost of diagnosing the U210c Mercury code
The cost of diagnosing the U210c Mercury code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
U210c Mercury Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
U210c Mercury Meaning
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.