With this standard, OBDII Scanner and OBDII Reader became popular tools that everyone can use to diagnose car malfunctions. It specifies the type of diagnostic connector and its pinout, the electrical signaling protocols available, and the messaging format. In 1996, a new specification, OBDII, was made mandatory for all cars sold in the United States.

The codes varied by manufacturers and make, which made it difficult for mechanics to diagnose the problem. If the codes are not cleared, then an ERASE FAIL message will appear. Press the ENTER button to Return to the main Menu list. OBD system started in the early 1980s with a simple function to turn on the malfunction indicator light or “idiot light” when it detects a malfunction. The MaxiScan OBD II Scan Tool is specially designed to work with all OBD II compliant vehicles, including those equipped with the next-generation protocol-Control Area Network (CAN). The Misfire Monitor constantly checks the rotational speed of the Crankshaft by. When the code P0301 is set in the Powertrain Computer, it means that the Misfire Monitor has detected more than a 2 percent variance in RPM between the firing of any two (or more) cylinders in the firing order. With a code reader or scanner, you can access one or more OBD2 codes that indicate the issues. P0301 Diagnostic Theory for Shops and Technicians. When the system identifies an issue, it turns on the check engine light and provides real-time data in addition to a standardized series of Diagnostic Trouble Codes (or DTCs). 2.2 Diagnostic Trouble Codes (DTCs) OBD II Diagnostic Trouble Codes are codes that are stored by the on-board computer diagnostic system in response to a problem found in the vehicle. On-Board-Diagnostic (OBD) Trouble Codes are one way your vehicle reports self-diagnostic results. 2) Which, if any, Diagnostic Trouble Codes (DTCs) are stored 3) Readiness Monitor status. In this video I show you how to use and review the Autel MS309 MaxiScan OBD2 Code Reader.AFFILIATE DISCLAIMER PLEASE READ:The links below are affiliate links.

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