Failure Effects Mode Management (Fail Safe Operation)

PURPOSE
Failure Effects Mode Management (FMEM) is an alternative system strategy in the [1][2]Powertrain Control Module (PCM) designed to maintain vehicle operation if one or more sensor inputs fail.

OPERATION
When a sensor input is perceived to be out-of-limits by the PCM, an alternative is initiated. The PCM substitutes a fixed value and continues to monitor the incorrect sensor input. If the suspect sensor operates within limits, the PCM returns to the normal engine running strategy.

All FMEM sensors display a sequence error message on the scan tool. The message may or may not be followed by a Key On-Engine Off or Continuous Memory Diagnostic Trouble Codes when attempting Key On Engine Running Self-Test Mode.