Preliminary Information

The Chevrolet Metro conforms to all OBD 2 mandated emission regulations. The powertrain control module (PCM) is responsible for monitoring and modifying engine controls in order to meet all OBD 2 requirements. Certain minimum criteria for how the PCM monitors and diagnoses the emission system is specified in the OBD 2 regulations. The following information describes the common operations and terms of the OBD 2 regulations that the Metro PCM is designed to adhere to.