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MODULE-POWERTRAIN CONTROL DESCRIPTION DESCRIPTION - PCM The Powertrain Control Module (PCM) is located in MODES OF OPERATION As input signals to the Powertrain Control Module (PCM) change, the PCM adjusts its response to the output The PCM will operate in two different modes: Open Loop and Closed Loop. During Open Loop modes, the PCM receives input signals and responds only according to preset PCM program- During Closed Loop modes, the PCM will monitor the oxygen (O2S) sensors input. This input indicates to the PCM The fuel injection system has the following modes of operation: • Ignition switch ON • Engine start-up (crank) • Engine warm-up • Idle • Cruise • Acceleration • Deceleration • Wide open throttle (WOT) • Ignition switch OFF The ignition switch On, engine start-up (crank), engine warm-up, acceleration, deceleration and wide open throttle IGNITION SWITCH (KEY-ON) MODE This is an Open Loop mode. When the fuel system is activated by the ignition switch, the following actions occur: • The PCM determines atmospheric air pressure from the MAP sensor input to determine basic fuel strategy. 8E - 278 ELECTRONIC CONTROL MODULES - SERVICE INFORMATION LX |