This is in no way definitive, but rather my approximation. 2001-2002 is Tier I, such as an S-15g fuel system with an O2 sensor (single wire), fuel control solenoid valve, and an ecu, Impco System in an MCFA Forklift. In a Nissan JO2 Tier I has a Feed back solenoid, a MAP sensor, a Nikki Converter, an ecu, and a single wire O2.
2002-2006 Tier 2 Nissan k-21 and k-25, Nikki fuel system, throttle body injection, mass air flow sensor, Electronic Throttle Control, 4 wire heated O2 sensor, an lp pressure sensor, cam and crank sensor, and coil on plug ignition coils, this applies to P and C series Cats and Platinum 1 Nissans. Similar changes to TB-45 6 cylinder Nissan. Changes also made to 4.3 liter GM in larger lifts.
2007 Tier III Platinum 2 Nissans On Board Diagnostics and changes to k-21 and k-25 ETC.
Not sure on Toyota Aisan Systems but I am guessing 7 series and 8 series are different Tiers, with units that have an Electronic Throttle Control being Tier III.
Not sure on the Hyster and Yale changes.
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