Various pre-2003 Nissan models are not OBD2 compliant. Engine ECCS diagnostic is
carried out using Nissan-specific (non-OBD2) diagnostic bus and protocol called "DDL" (Nissan Diagnostic Data Link).
Nissan specific data link connector (consult port)
| |
| 1 | DDL RX |
| 2 | DDL TX |
| 3 | |
| 4 | |
| 5 | |
| 6 | CHK |
| 7 | Ignition+ |
| 8 | Ground |
| 9 | DDL CLK |
| 10 | SP |
| 11 | PS |
| 12 | SCO |
| 13 | SCI |
| 14 | DT |
Nissan DDL with OBD2
Models having OBD2 connector and using Nissan DDL usually occupy the following pins:
4,5-GND
8-Ignition
12 DDL TX
13 DDL RX
9, 14 or 15 DDL CLK (Clock signal)
16-Battery+
