The inspection and readjustment of these components is usually called the basic inspection of automatic transmissions. No matter what the specific fault is, this basic inspection always needs to be carried out, and it is also the first step. The purpose of the basic inspection of electronic automatic transmissions is to verify whether the automatic transmission has the ability to operate normally. The inspection and adjustment items in the basic inspection include:; Oil level inspection, oil quality inspection, hydraulic control system oil leakage inspection, throttle cable inspection and adjustment, shift control lever position inspection and adjustment, neutral start switch inspection, overdrive control switch (O/D) inspection, and engine idle speed inspection. The prerequisite for basic inspection is that the engine is working normally, the chassis performance is good, especially the braking system is normal.