Engine Control Module
The powertrain has electronic controls to reduce exhaust emissions while maintaining excellent driveability and fuel economy. The Engine Control Module (ECM) is the control center of this system and is located on top front of engine. See Fig 1 . ECM monitors numerous engine and vehicle functions. ECM constantly looks at the information from various sensors and other inputs, and controls the systems that affect vehicle performance and emissions. The ECM also performs the diagnostic tests on various parts of the system. The ECM can recognize operational problems and alert the driver via the Malfunction Indicator Light (MIL). When ECM detects a malfunction, ECM stores a Diagnostic Trouble Code (DTC). The problem area is identified by the particular DTC that is set. The control module supplies a buffered voltage to various sensors and switches. Review the components and wiring diagrams in order to determine which systems are controlled by the ECM.