General Information

The Vehicle Control Module (VCM) is located in the engine compartment. The VCM is the control center for the engine component Systems which effect engine operation. The VCM constantly monitors and processes information from the various information sensors and switches. The VCM then sends the necessary electrical responses to control the various control system components. Review the wiring diagrams in order to determine which systems are controlled by the VCM. The VCM has the ability to perform on-board diagnostic tests on itself, the information system components, and certain control system components. The VCM has the ability to alert the driver of a malfunction by illuminating a Malfunction Indicator Lamp (MIL). The VCM has the ability to store certain information pertaining to a malfunction, including Diagnostic Trouble Codes (DTCs). Using serial data communication, a scan tool can retrieve this information in order to be viewed by the technician. The technician can use this information in order to identify, diagnose, and verify the repair of the malfunction. The VCM is sometimes referred to as the control module.