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The power ground is used to control ground circuits for the following PCM loads: • Generator field winding • Fuel injectors • Ignition coil(s) • Certain relays/solenoids • Certain sensors SENSOR RETURN The Sensor Return circuits are internal to the Powertrain Control Module (PCM). Sensor Return provides a low–noise ground reference for all engine control system sensors. Refer to Power OPERATION OPERATION - PCM 1. Also refer to Modes of Operation. The PCM operates the fuel system. The PCM is a pre-programmed, triple microprocessor digital computer. It reg- The PCM receives input signals from various switches and sensors. Based on these inputs, the PCM regulates The PCM adjusts ignition timing based upon inputs it receives from sensors that react to: engine rpm, manifold The PCM adjusts idle speed based on inputs it receives from sensors that react to: throttle position, vehicle speed, Based on inputs that it receives, the PCM adjusts ignition coil dwell. The PCM also adjusts the generator charge NOTE: PCM Inputs: • A/C request • Auto shutdown (ASD) sense • Battery temperature • Battery voltage • Brake switch • J1850 bus circuits • Camshaft position sensor signal • Crankshaft position sensor • Data link connections for scan tool • Engine coolant temperature sensor • Five volts (primary) • Five volts (secondary) • Fuel level • Generator (battery voltage) output • Ignition circuit sense (ignition switch in on/off/crank/run position) • Intake manifold air temperature sensor • Leak detection pump (switch) sense (if equipped) 8E - 282 ELECTRONIC CONTROL MODULES - SERVICE INFORMATION LX |