Detailed Inspection A Of Vehicle: Notes

Verify the malfunction symptom according to the following table and perform the applicable troubleshooting procedure.

	Primary cause	Secondary cause	Tertiary cause		Related part	Reference/measure
Vehicle malfunction	Brake pedal assist force is weak (In this case, the brake pedal is stiff, but if the brake pedal is depressed strongly, braking force corresponding to the amount of depression can be considered to be generated)	Negative pressure leak	Internal damage, poor engagement		Power brake unit	(See INSPECTION ITEM 1 .)
			Hole, poor engagement		Vacuum hose
		Insufficient negative pressure supply	Check valve does not open/remains open	Damage Adhesion of foreign matter
				Icing	Vacuum hose	(See INSPECTION ITEM 2 )
			Engine stall		Engine	(See INSPECTION ITEM 3 .)
			Insufficient negative pressure occurred at high idle speed		Engine	(See INSPECTION ITEM 4 .)
					Accelerator pedal, throttle valve	(See INSPECTION ITEM 5 .)
					Floor covering	(see INSPECTION ITEM 6 .)
			Insufficient negative pressure at high altitude and immediately after staring engine		Engine	(See INSPECTION ITEM 7 .)
			Vacuum pump operation malfunction (with vacuum pump)		Vacuum pump	(See INSPECTION ITEM 8 .)
		Negative pressure consumption is high	Brake pumping		-	(See INSPECTION ITEM 9 .)
	Brake pedal movement is blocked		Interference between brake pedal and floor covering		Floor covering	(See INSPECTION ITEM 10  .)
			Interference between brake pedal and foreign object (empty can)		Foreign object	(See INSPECTION ITEM 11  .)
			Brake pedal deformation, interference with floor		Brake pedal, floor	(See INSPECTION ITEM 12  .)
	Brake fluid pressure line is cut off		Blockage inside piping		Brake pipe, engagement area	(See INSPECTION ITEM 13  .)
			Solenoid valve remains closed due to malfunction		ABS HU/Control Module, DSC HU/Control Module	(See INSPECTION ITEM 14  .)
	ABS intervention too long	ABS HU/Control Module, DSC HU/Control Module control malfunction			ABS HU/Control Module, DSC HU/Control Module, ABS wheel speed sensor, ABS sensor rotor	(See INSPECTION ITEM 15  .)
Vehicle is normal	Customer mis-operation	Foot contacted something different, leg was stretched out and did not firmly depress pedal			-	(See INSPECTION ITEM 16  .)
	Operation of HLA (hill launch assist) * Normal operation. At this time, braking force is applied.	Operation of HLA (hill launch assist)			DSC HU/Control Module	(See INSPECTION ITEM 17  .)
	Operation of roll prevention function * Normal operation. At this time, braking force is applied.	Operation of roll prevention function			DSC HU/Control Module	(See INSPECTION ITEM 18  .)
	AUTOHOLD operation * Normal operation. At this time, braking force is applied.	AUTOHOLD operation			DSC HU/Control Module	(See INSPECTION ITEM 19  .)
	Operation of MRCC	Operation of MRCC			DSC HU/Control Module	(See INSPECTION ITEM 20 .)
	Other				-	Verification difficult Explain to the customer that there is no malfunction indicated in the vehicle inspection results