Hydraulic Pressure Tests

WARNING: This page is about a different car, the 2002 Toyota Land Cruiser, 2002 Lexus LX 470, 2001 Toyota Land Cruiser, and 2001 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Hydraulic pressure test should be performed with transmission fluid temperature of 158-176°F (70-80°C).

Ensure transmission fluid is at normal operating temperature. Remove plug from right side of transmission case and install appropriate pressure gauge.
Apply parking and service brakes. Start engine. Ensure idle speed is within manufacturer's specifications. Place gearshift lever in "D" range. See IDLE SPEED SPECIFICATIONS table.
Check main line pressure with engine at idle. Repeat procedure in "R" range. Compare all readings to specification. See LINE PRESSURE SPECIFICATIONS table.
Check main line pressure at full throttle (stall speed). Read highest pressure when engine reaches stall speed. Repeat procedure in "R" range. Compare all readings to specification. See LINE PRESSURE SPECIFICATIONS table. If hydraulic pressures are not to specification, check for the following conditions:
- If line pressure in all ranges exceeds specification, check for defective regulator valve, defective throttle valve or throttle cable out of adjustment.
- If line pressure is below specification in all ranges, check for defective oil pump, defective regulator valve, defective throttle valve, throttle cable out of adjustment or defective OD direct clutch.
- If line pressure is below specification in "D" range only, check for defective forward clutch, fluid leak in "D" range circuit or defective OD clutch.
- If line pressure is low in "R" range only, check for defective direct clutch, fluid leak in "R" range circuit or defective 1st and reverse brake.

LINE PRESSURE SPECIFICATIONS

Application	"D" Range - psi (kg/cm² )	"R" Range - psi (kg/cm² )
Idle Speed	70-78 (4.9-5.5)	101-115 (7.1-8.1)
Stall Speed	188-208 (13.2-14.6)	240-287 (16.9-20.2)