Judgment Of Line Pressure Test

JUDGMENT OF LINE PRESSURE TEST

Judgment		Possible Cause
Idle speed	Low for all positions ("P", "R", "N", "D", "M")	Possible causes include malfunctions in the pressure supply system and low oil pump output. For example Oil pump wear Pressure regulator valve or plug sticking or spring fatigue Oil strainer => oil pump => pressure regulator valve passage oil leak Engine idle speed too low
	Only low for a specific position	Possible causes include an oil pressure leak in a passage or device related to the position after the pressure is distributed by the manual valve.
	High	Possible causes include a sensor malfunction or malfunction in the line pressure adjustment function. For example Accelerator pedal position signal malfunction A/T fluid temperature sensor malfunction Line pressure solenoid malfunction (sticking in OFF state, filter clog, cut line) Pressure regulator valve or plug sticking
Stall speed	Oil pressure does not rise higher than the oil pressure for idle.	Possible causes include a sensor malfunction or malfunction in the pressure adjustment function. For example Accelerator pedal position signal malfunction TCM breakdown Line pressure solenoid malfunction (shorting, sticking in ON state) Pressure regulator valve or plug sticking Pilot valve sticking or pilot filter clogged
	The pressure rises, but does not enter the standard position.	Possible causes include malfunctions in the pressure supply system and malfunction in the pressure adjustment function. For example Accelerator pedal position signal malfunction Line pressure solenoid malfunction (sticking, filter clog) Pressure regulator valve or plug sticking Pilot valve sticking or pilot filter clogged
	Only low for a specific position	Possible causes include an oil pressure leak in a passage or device related to the position after the pressure is distributed by the manual valve.