used in all Honda car before 2001
Two connectors are used - with 3 pins and with 2 pins.
| Pin Number |
Pin Name |
Description (may be empty) |
| 1 | K-Line | Diagnostic |
| 2 | +12V | Battery power |
| 3 | GND | Ground |
| 2-pin connector | ||
| 4 | self-diagnostic codes | |
| 5 | self-diagnostic codes | |
