Status Byte
The status byte is designed to provide additional information about the DTC, such as when the DTC failed, when the DTC was last evaluated, and if any warning indication has been requested. Each of the eight bits in the status byte has a precise meaning that is defined in ISO 14229.
The protocol is that bit seven is the most significant and left most bit, while bit zero is the least significant and right most bit.
| Most Significant Bits | Least Significant Bits | ||||||
|---|---|---|---|---|---|---|---|
| Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |