CTS V6-3.2L VIN N (2003)
Engine Control Module: Description and Operation
Engine Control Module (ECM)
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. The ECM monitors numerous engine and vehicle functions. The 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 Lamp
(MIL). When the ECM detects a malfunction, the 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.
