Line Pressure Test

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.

Line Pressure Test Port

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Line Pressure Test Procedure

Inspect the amount of engine oil and replenish if necessary.
Drive the car for about 10 minutes to warm it up so that the ATF reaches in range of 50 to 80 deg.C (122 to 176 deg.F), then inspect the amount of ATF and replenish if necessary.
NOTE: The automatic fluid temperature rises in range of 50 to 80 deg.C (122 to 176 deg.F) during 10 minutes of driving.
After warming up remove the oil pressure detection plug and install the Tool.

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CAUTION: When using the oil pressure gauge, be sure to use the O- ring attached to the oil pressure detection plug.
Securely engage the parking brake so that the tires do not turn.

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Start the engine, then measure the line pressure at both idle and the stall speed.

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CAUTION:

Keep the brake pedal pressed all the way down during measurement.
When measuring the line pressure at the stall speed, refer to "STALL TEST".

Line pressure

: Refer to Line Pressure .

After the measurements are complete, install the oil pressure detection plug and tighten to the regulation torque below.

Oil pressure detection plug

:7.3 N.m (0.74 kg-m, 65 in-lb)

CAUTION: Do not reuse the O-ring.

Judgment of Line Pressure Test

Judgment		Possible cause
Idle speed	Low for all positions (P, R, N, D)	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 ATF 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.