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Nissan* and it's DDL (reading codes, data stream, MAP, etc.)

Take a look also "Nissan Data Scan" (with my Interface and my Screen Shots).

*pre-OBDII

** while only Photos and Screen Shots

"Statistical" table

(1) I don't know address and so can't read its data

(2) For example, the address for Top Speed Limiter is 7FA5. 5C_hex equals 184km/h. FF equals 255dec (510km/h).

Hope these links will help

Generic Nissan Engine ECU Register Table

Consult protocol, Nissan Technical egroup, Issue 6

Basic_Consult_Interface_Schematic

RS-232 Drivers and Receivers

Surface Vehicle recommended Practice (J2190)

OBD (ISO) to RS232 Interpreter

OBDScan Protocol Converter Interface

http://www.ghg.net/dharrison/obdscan.html 

Implementing the J1850 Protocol

http://cherrypicker.tripod.com/id10.html (ECU Tuning for VG30DETT)
http://pages.infinit.net/jsenk/
http://www.efilive.com/
http://www.obd2crazy.com/
http://www.elmelectronics.com/obdic.html

* "...SAE Recommended Practice J2534 (February, 2002), "Recommended Practice for Pass-Thru Vehicle Reprogramming". EPA will require that OEMs comply with SAE J2534 beginning with the 2004 model year..."
http://www.drewtech.com/support/j2534/intro.html
http://www.passthruxs.com/all_about_j2534

**J2008: Beginning 2002, manufacturers shall make available at a fair and reasonable price,all 2002 and newer model year vehicle emission-related diagnosis and repair information provided to the manufacturer’s franchised dealers.Within 30 days of its availability to franchised dealers.