Narrowing-Down Malfunctioning Parts

Judgment

Possible cause

Idle speed

Low for all positions ("P", "R", "N", "D", "L")

Possible causes include malfunctions in the pressure supply system and low oil pump output.

For example:

• Oil pump wear
• Damage of chain and sprocket
• 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
• CVT fluid temperature sensor malfunction
• Line pressure solenoid malfunction (sticking in OFF state, filter clog, cut line)
• Pressure regulator valve or plug sticking

Stall speed

Line pressure does not rise higher than the line pressure for idle.

Possible causes include a sensor malfunction or malfunction in the pressure adjustment function.

For example:

• TCM malfunction
• Line pressure solenoid malfunction (shorting, sticking in ON state)
• Pressure regulator valve or plug sticking

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:

• Oil pump wear
• Line pressure solenoid malfunction (sticking, filter clog)
• Pressure regulator valve or plug sticking

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.