Powertrain Control Module (Pcm)

If a system malfunction occurs, a back-up system within PCM controls fuel and ignition system functions according to preprogrammed values (limp-in mode). This allows vehicle to be driven, but performance may not be optimal. A self-diagnostic function allows PCM to store Diagnostic Trouble Codes (DTCs) in its memory. If a system fault occurs, Malfunction Indicator Light (MIL) will illuminate to inform driver of system problems and the appropriate DTC will be stored in memory. For further self-diagnostic system information, see SELF-DIAGNOSTICS article.

NOTE: Components are grouped into 2 categories. First category is INPUT DEVICES , which are components that control or produce signals monitored by PCM. Second category is OUTPUT SIGNALS , which are components controlled by PCM.