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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSTHEFT DETERRENT SYSTEMDESCRIPTION AND OPERATIONVEHICLE THEFT DETERRENT (VTD) DESCRIPTION AND OPERATIONENGINE CONTROL MODULE (ECM)
2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Engine Control Module (ECM)

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Engine Control Module (ECM)

The engine control module (ECM) verifies that the message received from the theft deterrent control module via the serial data circuit is valid. The ECM can learn only one start enable password. If the start enable message is valid, the ECM enables the starting and fuel delivery systems.

The ECM disables the starting and fuel delivery systems if any of the following conditions occur:

  • The start enable message is invalid.
  • The start disable message is sent by the theft deterrent control module.
  • No passwords are received-There is no communication with the theft deterrent control module.
IMPORTANT: On some vehicles, if the ECM is unable to communicate with the vehicle theft deterrent (VTD) system after the vehicle has started, the ECM will consider the VTD system to be malfunctioning. The ECM will enter a fail enable state and will command the security indicator to illuminate. When the ECM is in a fail enable state, the vehicle will NOT stall or stop running. If the ECM is in a fail enable state when the ignition is switched OFF, the ECM will remain fail enable until communications with the VTD system has been restored. When the ECM is in a fail enable state, the VTD system is NOT active and the vehicle will start. This feature is NOT available on all GM vehicle lines.
RENDER: 1.0x

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