2005 Yamaha G23-EZ "UMAX MEDIUM DUTY I" (48V - DC MOTOR) ...
Yamaha's listing puts a 2005 G23-EZ UMAX Medium Duty I under the same code as the 2004 car, G23EZ, with LIT-19616-G2-30 as the service manual. That overlap is normal in this range and is one reason to check the frame plate rather than the year alone.
The volume covers 2004 through 2009 and nine variants, carbureted and 48-volt electric UMAX cars together. Shared chassis and drive material is written once; where a season differs, the procedure says so.
For this electric car the core chapters are the battery pack and charger, solenoid and controller testing with the readings to expect, and motor removal and inspection, all supported by complete wiring diagrams.
Brake adjustment, rear axle overhaul, steering, suspension, wheels, frame and body follow with factory torque values and wear limits, and the maintenance table sets the intervals a working car should be held to.