The 1981 Datsun Nissan 720 Pick-up was powered by a 2.2L single overhead cam engine (code as Z22 engine) which generates 98 HP of power at 4000 RPM and 117 ft-lbs of torque at 1800 RPM. The following pictures describes the complete description of 1981 Datsun Nissan 720 Pick-up Complete Wiring Diagram and Electrical System Schematic.