Home » Tony’s Tips » Articles » Electrical & Instrumentation » QSB 5.9 SmartCraft ECM, Electronic Components, and Wiring HarnessesQSB 5.9 SmartCraft ECM, Electronic Components, and Wiring Harnesses QSB 5.9 SmartCraft version 1.0 QSB 5.9 SmartCraft version 2.x Smartcraft 1.0 vs 2.x Processor or ECM