WARNING: This page is about a different car, the 2007 Mazda B3000. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Heater, Upper Radiator And Coolant Bypass Hose
Courtesy of MAZDA MOTORS CORP.
Fig 2: Identifying Fuel Tube Spring Lock Coupling, Fuel Injector And Crank Shaft Position Sensor Electrical Connectors