On-Board Diagnostic System
DESCRIPTION AND OPERATIONThe Electronic Control Module carries out activities such as fuel injection control, idle air control and ignition timing control. In addition, the Electronic Control Module is equipped with several diagnostic test modes which simplify troubleshooting when a problem develops.
When an abnormality is detected in one of the sensors or actuators related to emission control, the CHECK ENGINE/MALFUNCTION INDICATOR LAMP illuminates as a warning to the driver.
When an abnormality is detected in one of the sensors or actuators, a diagnostic trouble code corresponding to the abnormality is output.
The RAM data inside the Electronic Control Module that is related to the sensors and actuators can be read by means of the scan tool or by reading the MIL blinks. In addition, the actuators can be controlled under certain circumstances.