ISO 9141The ISO 9141 standard refers to the communication protocol used by DaimlerChrysler, Honda, and Toyota.This protocol has been used since 1996.With the ISO 9141 protocol, each bit of information is 96 us long and has two voltage levels to represent alogic 0 or 1. A low voltage is a logic 0 and a high voltage is a logic 1.The data link connector (DLC) allows a scan tool to communicate with the serial data line. The serial dataline is the means by which the microprocessor-controlled modules that are connected to it communicatewith each other.Once the scan tool is connected to the serial data K line through the DLC at pin 7, the scan tool can be usedto monitor each module for diagnostic purposes and to check for diagnostic trouble codes (DTCs).
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