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)


1DDL RX
2DDL TX
3
4
5
6CHK
7Ignition+
8Ground
9DDL CLK
10SP
11PS
12SCO
13SCI
14DT

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+
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