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Failure Mode Effects Management

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2002 Mercury Sable, 2002 Mercury Mountaineer, 2002 Mercury Grand Marquis, 2002 Mercury Cougar, and 2002 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Failure Mode Effects Management (FMEM) is an alternate system strategy in PCM designed to maintain engine operation if one or more sensor inputs fail. When a sensor input is perceived to be out-of-limits by PCM, an alternative strategy is initiated. PCM substitutes a fixed value and continues to monitor incorrect sensor input. If suspect sensor operates within limits, PCM returns to normal engine operational strategy. All FMEM sensors display a sequence error message on scan tool. Message may or may not be followed by Key On Engine Off (KOEO) or Continuous Memory DTCs when attempting Key On Engine Running (KOER) self-test mode.

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