The Systems on the Car that we check are:
Engine, Transmission, Steering, Suspension, Brakes, and Fuel System. These are the major mechanical parts of a car.

Procedures Used :
Internal Engine pressure is normally checked (occasional access problems can prevent this).
Charging system is checked for charging rate. Charging system involves Alternator, Battery and wires, cables, and connections between.
Check for structural condition and Leaks.
When requested, vehicle is lifted for a more thorough underbody Check for structural condition and Leaks.