Hydraulic System Pressure Test

Disconnect pressure line at power steering pump. Install Pressure Gauge (J-26357 ) between power steering pump and steering. See Fig 1 . Open valve and bleed air from system. See HYDRAULIC SYSTEM BLEEDING under LUBRICATION in this article.

Fig 1: Checking Hydraulic Pressure
Courtesy of NISSAN MOTOR CO., U.S.A.
Check fluid level. Start and run engine, allowing fluid temperature in reservoir to reach at least 140-176°F (60-80°C).
Check pressure quickly with wheel turned to full lock position at both left and right positions.
NOTE: DO NOT hold steering wheel at or near lock position for more than 15 seconds.
Compare pressure to those listed. See HYDRAULIC SYSTEM PRESSURE SPECIFICATIONS . If pressure is lower than specification, slowly close shut-off valve and note pressure. DO NOT close shut-off valve for more than 15 seconds.
If pressure now reads within specification, power steering pump is okay but steering gear is defective.
If pressure reading is below or exceeds specification power steering pump is defective. Remove pressure gauge and bleed system.

HYDRAULIC SYSTEM PRESSURE SPECIFICATIONS

NOTE: Tire pressure must be correct prior to checking steering wheel turning force.