Power Steering Idle-Up System Test

WARNING: This page is about a different car, the 1991 Mitsubishi 3000GT and 1991 Dodge Stealth. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect pressure hose from power steering pump. Connect in-line a pressure gauge and hoses capable of handling 300 psi (21 kg/cm² ). Also connect a shut-off valve in-line with pressure gauge. See Fig 1 .

Fig 1: Connecting Pressure Gauge Shutoff Valve Assembly
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Bleed air from system by disabling ignition system and cranking engine while turning steering wheel completely from left to right several times. Start engine, and turn steering wheel back and forth to raise fluid temperature to approximately 122-140°F (50-60°C).
With engine idling, gradually close shutoff valve of pressure gauge to increase hydraulic pressure. If idle speed does not increase 200-250 RPM when fluid pressure reaches 213-284 psi (15-20 kg/cm² ), replace power steering idle-up switch.
Gradually open shutoff valve. If engine speed does not return to curb idle speed between 100-142 psi (7-10 kg/cm² ), replace power steering idle-up switch. Remove testing equipment. Bleed air from system as in step 2).