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POWERTRAIN CONTROL DESCRIPTION DESCRIPTION The PCM (1) or (2) is located in the engine com- partment (Fig. 3) or (Fig. 4). The PCM is referred to DESCRIPTION - MODES OF OPERATION As input signals to the Powertrain Control Module (PCM) change, the PCM adjusts its response to the 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 During Closed Loop modes, the PCM will monitor the oxygen (O2S) sensors input. This input indicates 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 engine warm-up, acceleration, deceleration and wide IGNITION SWITCH (KEY-ON) MODE This is an Open Loop mode. When the fuel system is activated by the ignition switch, the following • The PCM pre-positions the Idle Air Control (IAC) motor. • The PCM determines atmospheric air pressure from the MAP sensor input to determine basic fuel • The PCM monitors the engine coolant tempera- ture sensor input. The PCM modifies fuel strategy • Intake manifold air temperature sensor input is monitored. • Throttle position sensor (TPS) is monitored. Fig. 3 PCM MOUNTING - LEFT HAND DRIVE 1 - MOUNTING SCREWS (3) Fig. 4 PCM MOUNTING - RIGHT HAND DRIVE 1 - PCM TJ ELECTRONIC CONTROL MODULES 8E - 5 |